272147 Vanguard Single Cylinder 4/27/07 1:03 PM Page 1 272147 - Vanguard Single Cylinder OHV Air-Cooled Engines 272144 - Vanguard Twin Cylinder OHV Air-Cooled Engines 275429 - Vanguard Twin Cylinder OHV Liquid-Cooled Engines MS-0750 - Vanguard 3-Cylinder OHV Liquid-Cooled Gasoline Engines MS-1055 - Vanguard 3-Cylinder OHV Liquid-Cooled Diesel Engines BRIGGS&STRATTON CORPORATION Part No. 272147-1/07 POST OFFICE BOX 702 MILWAUKEE, WI 53201 USA BRIGGSandSTRATTON.
SECTION 1- Safety, Maintenance & Adjustments SECTION 2 -Troubleshooting SECTION 3 - Engine Disassembly SECTION 4 - Exhaust Systems SECTION 5 - Fuel Systems & Carburetion SECTION 6 - Governor Systems SECTION 7- Cylinder Heads & Valves SECTION 8 - Starters SECTION 9 - Lubrication Systems SECTION 10 - Cylinders, Covers & Sumps SECTION 11 - Crankshafts, Camshafts, Balancing Systems & Gear Reductions SECTION 12 - Pistons, Rings & Connecting Rods SECTION 13 - Final Engine Assembly SECTION 14 - Engine Specificatio
FORWARD This guide has been written and published by Briggs & Stratton Corporation to aid our dealers' mechanics and company service personnel when servicing the products described herein. It is assumed that these personnel are familiar with the servicing procedures for these products, or like or similar products, manufactured by Briggs & Stratton Corporation.
SECTION 1 - SAFETY, MAINTENANCE AND ADJUSTMENTS ENGINE SAFETY ................................................................................. 5 In The I nterest Of Safety ..................................................... 5 The Safety Alert Symbol ....................................................................... 5 Additional Precautions.......................................................................... 8 1 BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM..... 9 ENGINE MAINTENANCE......
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ENGINE SAFETY In The Interest Of Safety This repair manual contains safety information that is designed to: • Make you aware of hazards associated with engines. • Inform you of the risk of injury associated with those hazards. • Tell you how to avoid or reduce the risk of injury. WARNING • attempting to service this Before equipment, read and understand this manual and the operating instructions of the equipment it powers.
HAZARD SYMBOLS AND MEANINGS Explosion Fire Shock 1 Goggles Kick Back Toxic Fumes Chemical Burns Hot Surface Read Explosive Pressure Entanglement Disconnect Spark Plug WARNING The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. 6 WARNING Gasoline and its vapors are extremely flammable and explosive. Fire or explosion can cause severe burns or death.
DANGER Running engines produce heat. Temperature of muffler and surrounding areas can exceed 150°F (65°C). Severe burns can occur on contact. • • • Allow muffler, engine cylinder fins and radiator to cool before touching. Remove accumulated combustibles from muffler area and cylinder area. Install and maintain in working order a spark arrestor before using equipment on forest-covered, brush-covered unimproved land. The state of California requires this (Section 4442 of the Public Resources Code).
WARNING 1 Charging batteries produces hydrogen gas. Do not store or charge and battery near an open flame or devices that utilize a pilot light or can create a spark. WARNING Kerosene and its vapors are extremely flammable and should be handle d with t he same precautions as gasoline. DANGER Broken bones, fractures, bruises or sprains could result. • Remove all external equipment/engi ne loads before starting e ngine.
BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM 1 9
ENGINE MAINTENANCE Fuel and Oil Recommendations 1 Fuel Fuel must meet these requirements: • Use clean, fresh unleaded gasoline. • A minimum of 87 octane / 87 AKI (91 RON). For high altitude use, see “High Altitude” bel ow. • Gasoline with up to 10% ethanol (gasohol) or up to 15% MTBE (Methyl Tertiary Butyl Eith er) is accepta ble. CAUTION: Do not use unapproved gasoline minutes to circulate the stabilizer throughout the system. The engine and fuel can then be stored for up to 24 months.
1. Park equipment so engine is level. 2. Remove oil drain plug ([A] Fig. 2). • Drain oil while engine is still warm. 3. Install drain plug. Torque to value listed . SEE SECTION 14- ENGINE SPECIFICATIONS. 4. Remove oil filter ([C] Fig. 3), if equipped. • Clean surface of filter mounting adaptor ([D] Fig. 3). • Apply light coat of clean engine oil to new filter gasket. Fig. 1 CAUTION: The use of non-synthetic multiviscosity oils (5W-30, 10W-30, etc.
MAINTENANCE SCHEDULE 1 W ARNING Unintentiona l spa rking can result in fire or electric shock. Unin tentiona l sta rt-up can re sult in entanglem ent, traum atic amp utation or severe lacerations. Before perform ing adjustme nts or repairs: • Disconnect spark plug(s). • Disconnect neg ative (-) battery cable. • Use only the correct tools .
Air Cleaner Service CAUTION: Never operate an engine with the air cleaner assembly or air cleaner cartri dge removed. A correctly serviced air cleaner protects internal engine parts fr om airborne dir t and du st particles. If air cleaner instructions are not followed, particles that should be collected in the air cleaner will pass into the engine. These particl es are abrasive and will cause the piston rings and cylinder bore to wear more quickly.
1 Fig. 9 Fig. 7 Fig. 8 Fig.
Install Air Cleaner Assembly 1. Connect breather tube to back side of air cleaner base. 2. Position base (with new gasket) on carburetor. NOTE: Use new screws with sealant band or place non-hardening sealant on mounting screws. 3. Start screws into carburetor and tighten securely. 4. Install air cleaner element and/or precleaner. In-Line Fuel Filter Service Replace in-line fuel filter every year or 100 hours of operation, whichever occurs first. Replace the filter if dirt or water are present.
5. Turn idle mixture screw back to midpoint and release the speed control lever. 6. Install limiter cap (if equipped) using knockout pin (#19135). 1 Fig. 14 Fig. 12 NOTE: (138400) Does not have an idle adjustment screw. Fig. 15 7. Move speed control from SLOW to FAST. If the engine does not accelerate smoothly: • Adjust idle mixture screw 1/8 turn CCW. 8. Check idle RPM and readjust to specifications, if required. Fig.
Throttle Control (161400, 104700, 260700, 261700) Refer to Figures 16 and 17 that show your engine. 1. Loosen casing clamp screw (A). 2. Move throttle to FA ST . 3. Move casing in direction of arrow (B) until casing stops. 4. Tighten casing clamp screw. Fig. 16 Choke-A-Matic® (104700, 161400, 260700, 261700, 28Q700) Choke control cables are often provided by the original equipment manufacturer.
Clean the static screen ([A] Fig. 21) . 1 Fig. 19 Fig. 21 Clean the ducting (B) and cylinder fins ([C] Fig. 22), yearly or every 100 hours of operatio n. Clean more often when dust or airborne debris is present. Fig. 20 Cooling System Maintenance CAUTION: Keep engine parts clean to reduce the risk of overheating and ignition of accumulated debris. Do not use water to clean engine. Water could contaminate fuel system and short out electrical systems. Low pressure (5-10 psi.
Flywheel Brake Adjustments (104700) The flywhe el brake system is part of a safety control mechanism required by some equipment applications. When the operator releases an equip ment control (bail) with the engine running at the FAST selection, the flywheel brake must stop the engine within 3 seconds. WARNING Unintentional sparking can result in fire or electric shock. Unintentional start-up can result in entanglement, traumatic amputation or severe lacerations.
Static Governor Adjustment (161400, 104700, 260700, 261700, 28Q700) 1. Loosen nut holding governor lever ([A] Fig. 25) to governor crank. 2. Rotate throttle linkage from idle to wide open throttle. Note the direction of rotation of the governor arm attached to the throttle linkage. 3. Place and hold the throttle in high speed position. 4. While holding the throttle plate, rotate the governor shaft ([B] Fig. 25) until it stops in the direction noted in step 2. 5.
3. With the carburetor idle speed screw (A), adjust RPM to 1200 RPM. 4. With governed idle screw ([B] Fig. 30), adjust RPM to 1400 RPM. 1 Fig. 27 Fig. 28 Fig. 30 Governed Idle Speed Adjustments (085400, 086400, 115400, 117400, 138400, 185400, 235400, 245400) Recommended tools: #19200 NOTE: (050000, 118400, 28Q700) Do not have a Governed Idle Speed adjustment. #19389 Fig. 29 1. Start and run engine at 1/2 throttle for 5 minutes to bring engine to operating temperature. 2. Move throttle to SLOW .
Governed Idle RPM Adjustments (161400, 260700, 261700) 1 5. Remove rod ([C] Fig. 33 th rough Fig. 35). #19480 or #19229 Fig. 31 Install all linkages and springs and be sure that all carburetor adjustments have been made before performing any of the run ning governor adjustments. To find the corr ect top no load RPM by model-type number, log into thepowerportal.com//repower. Fig. 33 NOTE: (104700) Does not have a governed idle adjustment.
• Some units may have remote throttles furnished by the OEM. 1. Move throttle to FA ST . 2. Align holes in the governor control lever gear (A) and governor control plate ([B] Fig. 37 or Fig. 38). 3. Insert 0.125 in. (3.2 mm) diameter rod ([ C] Fig. 37 or Fig. 38). NOTE: (104700) Alignment holes on early production models were 0.062 in. (3.2 mm). 4. Using tang bender tool (D), bend spring tab (or turn adjustment screw) to ob tain proper top no load RPM. Fig. 35 4. Using tang bender tool ([D] Fig.
Top No Load RPM, Fixed Speed Adjustable (161400 - No Generators) Top No Load RPM, Fixed Speed Adjustable (161400 - Generators) 1. Turn the speed regulator nut ([A] Fig. 41) until the desired top no load speed is achieved. 1 Fig. 39 1. Turn speed regulator nut (A) clockwise (CW) to align top no load holes in governor control lever gear and governor control plate. 2. Insert 0.125 in. (3.2 mm) diameter rod ([ B] Fig. 40). 63 Fig. 40 3. Using tang bender tool ([C] Fig.
clarity)use the tang bender ([A] Fig. 42) to obtain proper pre-load speed. 5. use the tang bender ([A] Fig. 42) to obtain proper pre-load speed. 6. As soon as pre-load RPM is set, move throttle to IDLE. 7. Stop engine. 8. Engage speed regulator nut back into notch in the control panel. 1 Top No Load RPM: • 3150 RPM (50 cycles) • 3750 RPM (60 cycles) Pre Load RPM: • 4000 RPM (50 cycles) • 4300 RPM (60 cycles) Fig.
3. With the engine running, apply 12VDC to white connector with the blue wires([C]Fig. 44). Extended governor will be pulled against head of idle down bolt. ([C]Fig. 44). Use a wire gauge ([A] Fig. 45) to set the spark plug gap. Set spark plug gap at listed value. 1 Fig. 45 Torque spark plugs to listed value. SEE SECTION 14- ENGINE SPECIFICATIONS. Valve Clearance Adjustments Fig. 44 4. Adjust nut ([A] Fig. 44) to obtain 2100-2500 RPM .
7. Tighten the jamb nut without moving the adjustment screw Fig. 46, 47, 49, 49. 1 Fig. 46 8. Rotate the crankshaft through a few revolutions and recheck the clearance. Fig. 49 Combustion Chamber Deposits Remove combustion chamber deposits every 500 hours or whenever cylinder head is removed. WARNING Wear eye protection when using compressed air to clean parts. Fig.
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SECTION 2 - TROUBLESHOOTING GENERAL INFORMATION ............................................................................ 31 SYSTEMATIC ENGINE CHECKS. ................................................................. 31 IGNITION SYSTEM...... .................................................................................. 32 Spark Test ................................................................................................................32 Spark Miss Test.......................................
ELECTRICAL COMPONENT TESTS ............................................................ 45 Diode Test ................................................................................................................45 Anti-Afterfire Solenoid Test ......................................................................................46 Batteries ...................................................................................................................4 7 Installing A Battery ...........................
GENERAL INFORMATION Most complaints concerning engine operation can be classified as one or more of the following: 1. Will not start 2. Hard starting 3. Lack of power 4. Runs rough 5. Vibration 6. Overheating 7. High oil consumption An important consideration to remember is that what appears to be a problem with the engine may actually be the fault of the equipment. Since many types of equipment are powered by Briggs & Stratton engines, it is impossible to list all the conditions that may exist.
IGNITION SYSTEM Operate starter and be sure the RPM is 350 or more. Observe tester gap in window of tester. Spark Test If spark jumps tester gap: • Ignition is good. If spark does not jump tester gap: WARNING 2 Prevent accidental starting. Re move the spark plug wire from the spark plug. Ground the wire a fter removal. Failure t o do so can cause pers onal inju ry. Test Magnetron armature on the engine. Before replacing the armature, be sure that the problem is not in the wiring or switches.
Dry plug symptoms: • Leaking carburetor mounting gaskets • Gummy or dir ty carburetor, fuel line or tank • Float needle valve stuck shut • Inoperative fuel pump • Inoperative anti–afterfire solenoid To determine if fuel is getting to the combustion chamber through the carburetor, remove the spark plug and pour a small quantity of gasoline through the spark plug hole. Replace the spark plug. If the engine fires a few times and then stops: • Focus your attention on dry plug symptoms.
NOTE : The crankshaft must be held with the NOTE : Any air lea ks at the connections or piston at top dead center to seal the combustion chamber and eliminate any chance of rotation. If the engine is installed in an application, the equipment can often lock the crankshaft from moving. fittings of the tester will affect the accuracy of the test. 6. Pull out the regulator adjustment knob (A) and turn knob counterclockwise as far as it will go. Make sure air outlet valve ([B] Fig. 3) is closed. 2 10.
11. When te st is complete, close air valve. Then, pull out knob and turn counterclockwise as far as it will go to release pressure in combustion cha mber. 12. Disconnect outlet hose from tester before removing from spark plug hole.
DC Shunt Diode Test 0 10 OFF V 20 Insert the BLACK test lead into the COM receptacle of the multim eter. Insert the RED test lead into the VΩ receptacle. Set the rotary switch to +))))). This setting also signals continuity with a continuous tone. 30 ∼ V 30 0m V Ω A~ A VΩ 10A FUS ED 2 COM When checking DC output on systems over 10 Amps, use a digital multimeter with the DC Shunt ([# 19468] Fig.12) to avoid blowing a fuse in the multimeter. Fig.
2. Test diode(s). Test in the following sequence: 1. Set meter to DC Output test. See Figure 11. 2. Attach RED test lead clip to DC output terminal connector ([A] Fig. 14). 2 Fig. 15 If meter beeps once: • Diode is OK. If meter makes a continuous tone : Fig. 14 • Diode is shorted. • Replace the diode. If meter displays OL: 3. Attach BLACK test lead clip to positive (+) battery terminal ([B] Fig. 14). 4. Start engine. Output should be 2 to 4 amps DC @ 3600 RPM. Output will vary with battery voltage.
2 AC Only Alternator 1.2 Amp Unregulated Alternator The AC alternator provides current for headlights only. Current for lights is available when the engine is running. Use 12 volt lights with a total rating of 60 - 100 watts to test the alternator. With lights rated at 70 watts, the voltage rises from 8 volts at 2400 RPM to 12 volts at 3600 RPM. The brightness of the light(s) changes with engine speed. 1. Set meter to AC test. See Figure 5. 2.
4 Amp Regulated Alternator The electrical system must be connected to a charged 12 volt battery to test alternator output. 1. Disconnect battery ground cable from battery negative (-) terminal. 2. Set meter. See Figure 11. 3. Place DC Shunt # 19468 on negative battery post. Install negative ([A] Fig. 19) cable on DC shunt battery terminal. 4. Connect multimeter test leads to DC shunt terminals, red to RED (B) and BLACK to BLACK ([C] Fig. 19). 5. Adjust governor to 3600 RPM.
2 Fig. 20 Fig. 21 3. Attach BLACK test lead clip to engine ground. AC output should be no less than 40VAC @3600 RPM. 3. Attach BLACK test lead clip to positive (+) battery terminal. 4. Start Engine. Output should be 3 – 9 Amps @ 3600 RPM. If no or low output is found: • Replace stator. 9 Amp DC Outp ut Test When testing regulator–rectifier for amperage output, a 12 volt battery with a minimum charge of 5 volts is required. There will be no charging output if battery voltage is below 5 volts.
If there is continuity: • Reconnect the RED wire with BLACK stripes to regulator/rectifier. 11. Connect multimeter test leads to the two wires not connected to regulator/rectifier. There should be continuity . If there is no continuity: • Replace stator. If there is continuity: Fig. 22 2 • Check for continuity between GREEN wire and engine ground. There should not be continuity. If there is continuity to ground: • Replace stator. • Readjust governor to original set RPM.
Fig. 23 2 When checking alternator components, make tests in the following sequence: Test Alternator Output 1. Temporarily disconnect stator wire harness from regulator-rectifier. 2. Set meter to AC Volts position. See Figure 5. 3. Insert RED and Black test lead probes into output terminals in yellow connector, as shown in Figure 24. 4. With engine running at 3600 RPM output should be no less than: • 20 Volts- 10 Amp System • 30 Volts- 16 Amp System 5.
Dual Circuit Alternator The dual circuit alternator provides DC for battery charging and AC for the headlights. The battery is not used for the lights, so lights are available if battery is disconn ected or removed. The current from the DC side of the alternator is unregulated and rated at 3 amps. The output rises from 2 amps at 2400 RPM to 3 amps at 3600 RPM. This alternator uses a polarized plug with two pins. The RED lead (A) charges the battery, the WHITE lead ([B] Fig. 26) is for lights.
If meter still displays OL: • Diode is open. • Replace the diode. 4. If diode tests OK, check sta tor for bare wires or other obvious defects. If grounded leads are not visible, replace the stator. 2 Output should be no less than 14 volts AC @ 3600 RPM. If no or low output is found: • Replace stator. Tri–Circuit Alternator The tri–circuit alternator provides AC through a single output lead and connector ([B] Fig. 29) to a wiring harness containing two diodes (C).
Test in the following sequence: 1. Set meter. See Figure 5. 2. Attach RED test lead clip to green output terminal ([F] Fig. 31). 2 Fig. 32 Fig. 31 3. Attach BLACK test lead clip to engine ground. Output should be no less than 28 Volts AC @ 3600 RPM. If no or low output is found: • Replace stator. If alternator output is good: • Test diodes located in wiring harness. Diode Test NOTE: One diode is for the charging circuit and the other diode is for the lighting circuit.
2 Fig. 33 Lighting Circuit Test (White Wire) 1. Insert RED test lead into VΩ receptacle in meter. 2. Insert BLACK test lead into COM receptacle. 3. Rotate selector to+))))) (DIODE TEST) position. See Fi gure 9. 4. Attach RED test lead clip (A) to point (B) of the WHITE wire (C), FIG.33. (It may be necessary to pierce wire with a pin as shown.) 5. Insert BLACK test lead probe (D) into harness connector. • If meter BEEPS once, diode is OK. • If meter makes a CONT INOUS TONE, diode is shorted.
Plunger ([A] Fig. 34) should retract freely. When battery connections is removed, plunger should return. Replace solenoid if plunger sticks or doesn’t move. Batteries Handling Instructions Batteries contain corrosive fluid s and toxic materials. Handle with care. • Keep batteries away from children. • Do not puncture, mutilate, disassemble or incinerate. • Do not (short) make direct contact between (+) positive and (-) negative battery terminals.
Meter should display 9 volts or more when cranking engine. If less than 9 volts: • Replace battery. 8. With battery charged, check specific gravity readings of each cell (B) with a hydrometer ([A] Fig. 36). 9. Record the results. 2 If control lever does not contact stop switch tang: • Check control cable for adjustment or binding. Bend tang as required or replace worn parts as needed. 2. Inspect stop switch mounting to be sure switch is firmly anchored in control bracket.
2 Fig. 40 Fig. 39 8. Move stop switch wire(s) ([A] Fig. 39). Continuity should remain constant. If intermittent or no continuity exists, repair or replace wire(s) or connections. 9. Move test lead from stop switch wire ([A] Fig. 39) to engine ground. With speed control set to FAST , • There should be no continuity. 10. Move speed control to STOP. • The meter should show continuity. 3. Move safety control to RUN. The brake pad lever tab must not con tact the switch tang. 4.
2. Operate rocker switch and observe meter readings. 3. The meter should show maximum or very low resistance as the switch is moved back and forth. Replace the switch if it remains open or closed in both positions. NOTE: (185430-0099-01 ) is wired with components supplied by the OEM. Contact the OEM for wiring diagrams and service information. 2 Stop Switch Adjustments (161400) 1. Move remote speed control to the FA ST position. 2. The governor control lever should not ([A] Fig.
There should be continuity between the terminals as listed in the table. Replace switch if the re is no continuity or continuity exists where it should not. OFF M M+ Yes Yes B L shown in Fig. 45.There must be continuity between terminals #1, #3, # 6 and the key switch case when key switch is OFF. ST Stop 1 Yes 2 Yes Yes Run Yes Start 4. Check each terminal for continuity to ground. The only terminal that should have continuity to ground is the M termin al.
2. Connect one tester lead to the switch terminal and the other tester lead to the metal body of the switch, Fig. 49. 2 Fig. 47 Fig. 49 Fig. 48 NOTE: (104700) The pressure switch may activate at engine speeds below 2000 RPM, which is normal. There should be continuity when no pressure is applied to the switch. 3. Connect the probe end of the switch to a low pressu re source ([A] Fig. 49). The switch should open at approximately: • 104700 - 4 to 6 psi (0.28 - 0.41 bar) • 260700, 261700 - 7 to 10 psi (0.
1. Oil level must be between the ADD and FULL mark on dipstick. 2. Remove pressure switch or 1/8 in. NPTF plug in oil filter adapter. 3. Install oil pressure gauge ([A] Fig. 50). 4. Start engine. Run for approximately 5 minutes. 5. Check oil pressure at 3000 RPM. Oil Pressure should be 10~50 psi (0.7~3.5 Bar).
• Check the ignition switch ([H] Fig. 51). If the wire is go od: • Replace the float sensor in the cylinder ([F] Fig. 52). Symptom: Engine will no t start • Disconnect wire at ([C and D] Fig. 52) and start engine. If the engine does not start: • Check the ignition armature (G) for grounds. 2 If the engine starts and runs: • Reconnect the wire at (C). If the engine does not stop: • Reconnect the wire at (D). If the engine d ies: • Check the ON/OFF rocker switch ([H] Fig. 52). Fig.
Troubleshooting Oil Gard® (161400) 2 Fig.
STARTER MOTORS Check Starter Motor Drive (All Models) 1. When the starter motor is activated, the pinion gear should rise, engage the flywheel ring gear and crank the engine. If the drive does not react properly, inspect the helix and pinion gears for operation or correct rotation, Fig. 54. 2 Check Starter Motor Wiring (138400, 185400, 235400, 245400) Required Equipment: Multimeter set to DC Volts. 1. Charge the battery if the voltage is low. 2. Set meter. See Figure 6. 3.
Test Key Switch & Solenoid (138400, 185400, 235400, 245400) If continuity is present: Required Equipment: Set meter. See Figure 8. 1. Turn the key switch ON. 2. Check for contin uity at the input side (A) o f the solenoid and ground ([B] Fig. 57). If not: • Proceed to step 4. • Replace key switch. 4. Reconnect the connector from the starter switch. 5. Test for continuity at the output terminal (A) of the solenoid with the key in the START position and ground ([B] Fig. 59). 2 Fig. 57 Fig.
2. Connect starter motor (A), starter switch (B), DC shu nt (C) on negative battery terminal (D) and meter ([E] Fig. 60). Remove starter motor from engine. 1. Set multimeter to 300mv. See Figure 7. 2. Connect starter switch (D) to starter motor (E), battery (C), BLACK lead (G), RED lead (H), shunt (B) and multimeter ([A] Fig. 61). 2 Fig. 60 3. Activate starter motor. • Tachometer should read 6800 RPM minimum. • Meter should not read more than 25 amps.
SECTION 3 - ENGINE DISASSEMBLY GENE RAL DISASSEMBLY STEPS ............................................................... 61 Blower Housing Removal ( 050000, 085400, 0 86400, 1 15400, 1 17400, 118400, 185400 ) ................................................................................................................... 61 Blower Housing Removal (138400, 235400, 245400) ............................................. 61 Blower Housing Removal (104700) .....................................................
BREATHER SYSTEMS ................................................................................. 67 Breather System (050000, 085400, 086400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) ....................................................................................................6 7 Remove/Replace Breather System (10470 0) .................................................................................................................. 67 Breather System (16140 0) ........................
GENERAL DISASSEMBLY STEPS The sequence of actions required to disassemble the outer components of an engine vary from model to model. As a general rule, it is most efficient to remove only those items that prevent access to a system or part. This section discusses removing all external systems and components but does not open cylinder housing s or heads. Always remove spark plugs before performing any maintenance on the engine.
Blower Housing Removal (161400) 1. Remove the five screws ([A] Fig. 4) that secure the blower housing to the engine block. Blower Housing Removal (28Q700) 1. Remove the oil cap and dipstick assembly. 2. Remove the four screws (A) that secure the rotating screen. 3. Remove the two mounting bolts ([B] Fig. 6) that secure the fuel pump mounting bracket. 3 Fig. 4 Blower Housing Removal (260700, 261700) 1. Remove the oil dipstick cap. 2. Remove screws ([A] Fig. 5) from the blower housing. Fig. 6 4.
7. Remove the two screws that hold the rear housing mounting bracket ([B] Fig. 8). 3 Fig. 9 Fig. 8 NOTE : Leave the cotter pin ([C] Fig. 9) in the 8. Remove inner blower housing and set aside. governor shaft to prevent it from falling into the cylinder. Control Bracket Removal (104700) CONTROL BRACKETS Control Bracket Removal (050000, 085400, 086400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) Control brackets on these models are incorporated into the blower housing.
3. Remove the screws holding the control bracket ([A] Fig. 11). Control Bracket Removal (260700, 261700) NOTE : For better access to the control bracket, remove the oil filter adapter first. SEE SECTION 3- OIL FILTER ADAPTER. 1. Remove the links and springs from the governor lever ([A] Fig. 13). 3 Fig. 11 4. Remove the clamp that secures the governor lever to the shaft. Control Bracket Removal (161400) 1. Remove governor lever.(A). 2. Disconnect springs and links (B) from governor lever. 3.
Control Bracket Removal (28Q700) ENGINE BAFFLES NOTE : Part of the control bracket assembly Engine Baffle Removal (05000, 085400, 086400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) must be removed in order to remove the carburetor. SEE SECTION 5- REMOVING CARBURETOR. To remove remaining control bracket components: 1. Remove the three screws ([A] Fig. 15) that secure the bracket to the cylinder.
Engine Baffle Removal (161400) The main cylinder baffle is removed with the engine control bracket. SEE SECTION 3CONTROL BRACKET REMOVAL.. Remove the bo lts holding the baffle shown below ([A] Fig. 18). NOTE : The l ower baffle still has one mounting bolt that will be removed when the flywheel is removed. SEE SECTION 3- FLYWHEEL REMOVAL. 3. Remove the bolts that secure the baffle to the cylinder ([A] Fig. 20). 3 Fig. 20 Fig. 18 Engine Baffle Removal (260700, 261700) Engine Baffle Removal (28Q700) 1.
BREATHER SYSTEMS Briggs & Stratton engines use a breather valve to maintain and control a pulsating vacuum in the cylinder or sump. The vacuum helps to control oil leakage past piston rings, valve guides, oil seals, governor lever shaft and gaskets. The breather valve is a fiber disc or reed that closes on the piston's up stroke and opens on the piston's down stroke. Breather System (050000, 085400, 086400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) Remove Valve Cover 1.
2. Remove breather cover ([A] Fig. 24) from top of cylinder. NOTE: Fiber disc valve cannot be checked with gauge. 3. Replace the valve if it is warped, worn or damaged. 4. Install disc valve on seat ([B] Fig. 25). Breather System (161400) 1. Remove four screws that hold valve cover (A) and gasket (B). 2. Remove valve cover. Breather assembly (C) and gaske t ([D] Fig. 27) will come off with valve cover. 3 Fig. 27 Fig. 25 5. Install gasket, cover, and screws. Torque screws to listed value.
3. Install screws. Torque screws to listed value. SEE SECTION 14- ENGINE SPECIFICATIONS. CAUTION: Do not force the gauge. The fiber disc valve is held in place by a retainer that will distort if pressure is applied to the disc. Breather System (260700, 261700) NOTE: (260700, 261700) Two lengths of breather tubes were used. The standard tube is used when the air cleaner base mounts directly on the carburetor.
2. Remove two screws holding breather. Remove breather and gasket and discard gasket. 3. A 0.045 in. (1.14 MM.) wire gauge (A) should not enter the space between the fiber disc valve (B) and the body (C). The breather holes ([D] Fig. 34) must be open. 4. Check as shown in. Fig. 34. Fig. 32 2. Install new disc valve and retainer assembly. Torque screws to listed value. SEE SECTION 14- ENGINE SPECIFICATIONS. 3 3. Install cover ([A] Fig. 33) with new gaske t. Torque screws to listed value. Fig.
ELECTRIC STARTER MOTORS Electric Starter Removal (138400, 235400, 245400) Electric Starter Removal (104700, 260700, 261700, 28Q700) 1. Remove the two bolts that secure starter to cylinder ([A] Fig. 37 , 38,39). 1. Remove negative battery cable. 2. Disconnect the wire from the key switch. 3. Remove the nuts ([A] Fig. 35) that support the starter motor. 4. Remove starter. 3 Fig. 37 Fig. 35 1. Disconnect the wire from the voltage regulator. 2. Remove the nuts ([A] Fig. 36) that support the starter motor.
Ignition System Removal (050000, 085400, 086400, 115400, 117400, 118400, 235400, 245400, 161400, 104700, 260700, 261700, 28Q700) 41) or other strap wrench or socket-type flywheel holder, determined above. 3. Turn the flywheel nut CCW with a 1/2 in. breaker bar (B) and socket to remove. 1. Disconnect stop switch w ire (A) at armature (B). 2. Remove armature screws ([C] Fig. 40). 3. Lift off armature. 3 Fig. 41 Fig. 40 FLYWHEELS 4.
Flywheel Removal (104700) 1. Disconnect the tension spring on the flywheel brake from its anchor ([A] Fig.45). 3 Fig. 43 Fig. 45 2. Remove the flywheel nut with a strap wrench and a 1in. socket. 3. Using tool #19203, remove flywheel and drive key. Flywheel Removal (260700, 261700) 1. Remove the nut and washer and starter cup ([A] Fig. 46). Fig. 44 Fig. 46 2. Remove the second nut and washer ([B] Fig. 46). 3. Remove the backing plate that secures the fan to the flywheel.
4. Install tool #19203 as shown ( [A] Fig. 47) and tighten the nuts evenly until the flywheel comes free of the crankshaft. 3 Fig. 49 Fig. 47 When the flywheel is removed, the stator and the remaining bolt ([A] Fig. 48) for the support baffle can be removed. 2. Use a new gasket and reposition adapter. 3. Torque screws to listed value , as shown in Fig. 50. Fig. 50 Fig. 48 OIL FILTER ADAPTERS Remove/Replace Oil Filter Adapters 1. Remove oil filters and oil filter adapters as shown below. Fig.
SECTION 4 - EXHAUST SYSTEMS GENERAL INFORMATION ............................................................................ 77 Inspecting Exhaust Systems....................................................................................77 REMOVE/INSTALL EXHAUST SYSTEM (050000, 085400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) .................................... 78 REMOVE/INSTALL EXHAUST SYSTEM (104700) ....................................... 79 REMOVE/INSTALL EXHAUST SYSTEM (161400) .....
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GENERAL INFORMATION To meet the various requirements of the original equipment manufacturers (OEMs), some engines are shipped without exhaust systems. Exhaust systems for these engines are serviced and supplied by the OEM. Contact the original equipment manufacturer for speci fic service information on non-Briggs & Stratton exhaust systems. CAUTION: When replacing exhaust system Fig. 1 components, replacement parts must be the same as originally specified by the OEM.
REMOVE/INSTALL EXHAUST SYSTEM (050000, 085400, 115400, 117400, 1 18400, 138400, 1 85400, 235400, 245400) A typical muffler installation for the models listed above is shown in (Fig. 2). Fig. 4 2. Remove two muffler nuts ([A] Fig. 5). 4 Fig. 2 To remove the muffler assembly: 1. Remove muffler brace screws ([A] Fig. 3 or Fig. 4), if equipped. Fig. 5 3. Remove the muffler and exhaust gaskets. 4. Inspect the exhaust system. SEE SECTION 4- EXHAUST SYSTEMS. To install the muffler assembly: Fig.
4. Check for proper alignment and any interference issues. 5. Torque muffler nuts to listed values. 6. If equipped, torque muffler brace screw to listed values. 4. Remove backplate and gasket. SEE SECTION 3-ENGINE DISASSEMBLY. 5. Take off the two screws (A) that hold the exhaust elbow shield ([B] Fig. 8) and remove shield. REMOVE/INSTALL EXHAUST SYSTEM (104700) 4 Fig. 8 6. Remove the screws ([A] Fig. 9) hol ding the exhaust elbow and set elbow aside. Fig. 6 To remove 104700 muffler assembly: 1.
To install the 104700 muffler system: NOTE : U se (#93963) valve lubricant on all REMOVE/INSTALL EXHAUST SYSTEM (161400) exhaust system threads to prevent galling of the threads and ease future disassembly. 1. Position new gasket, exhaust elbow and screws ([A] Fig. 10). 2. Torque screws to listed values. 3. Place the exhaust elbow shield in position and secure with the two mounting screws ([A] Fig. 10). Torque screws to listed values. 4 Fig. 11 To remove muffler from model 161400: 1.
3. Take the muffler guard bracket ([A] Fig. 13) off of the muffler. To install muffler to model 161400: 1. Assemble the lower portion of the exhaust manifold (with its gasket) and two bolts ([A] Fig. 16) to the muffler and fingertighten. Fig. 13 4. Remove the mounting screws that secure muffler (A) to its support bracket (B) and exhaust manifo ld ([C] Fig. 14). 4 Fig. 16 2. Secure the muffler/manifold assembly and its gasket to the head and finger-tighten. 3.
When all components are properly aligned; 4. Torque manifold bolts ([A] Fig. 18) to listed values. SEE SECTION 14- ENGINE SPECIFICATIONS. 5. Torque bracket bolts ([B] Fig. 18) to listed values.SEE SECTION 14- ENGINE SPECIFICATIONS. 6. Install manifold guard bracket and torque to listed values. 7. Install the muffler heat shield bracket [A] with four screws. Torque to listed values. REMOVE/INSTALL EXHAUST SYSTEM (260700, 261700) 4 Fig. 20 Fig. 18 8. Secure muffler guard ([A] Fig.
that secure the exhaust elbow cover (Fig. 22). Fig. 22 5. With the clamp loose, work the muffler free of manifold. 6. Slide exhaust elbow cover free of exhaust manifold. NOTE : If further engine disassembly is required: Remove bracket screws ([A] Fig. 23 ) under cylinder head and remove bracke t. 4 Fig. 24 10. Inspect the exhaust system components. SEE SECTION 4- EXHAUST SYSTEMS.
3. Place exhaust manifold elbow on gasket in heat shield and install mounting bolts. ([A] Fig. 26) 11. Torque muffler clamp screw and nut to listed values.SEE SECTION 14- ENGINE SPECIFICATIONS. 12. Torque lower bracke t bolts to listed values. SEE SECTION 14- ENGINE SPECIFICATIONS. 13. Install mounting screws in exhaust elbow cover. 14. Torque all fasteners to listed values. REMOVE/INSTALL EXHAUST SYSTEM (28Q700) Fig. 26 4 4. Torque bolts to listed values.
5. Remove muffler adapter screws ([A] Fig. 30). 6. Bend tabs ([A] Fig. 32) to secure the bolts. A T-40 TORQUX ™ bit is required. Briggs & Stratton (#19442) “TORQUX STAR BITS.” Fig. 32 4 Fig. 30 6. Inspect the exhaust system components. SEE SECTION 4- EXHAUST SYSTEMS. To install muffler on Model 28Q700: NOTE : U se (#93963) valve lubricant on all exhaust system threads to prevent galling of the threads and ease future disassembly. 1. Install muffler adapter with new gasket. Fig. 31 2.
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SECTION 5 - FUEL SYSTEMS AND CARBURETION FUEL SYSTEM CLEANING AND INSPECTION............................................ ………..89 FUEL TANKS, FITTINGS AND LINES ........................................................... ………..90 Fuel System (050000, 118400)................................................................................………...90 Fuel System (085400, 115400, 117400, 138400, 185400, 235400, 245400) ......... ………...90 Fuel System (104700) .........................................................
5 88
WARNING Gasoline and its vapors are extremely flammable and explosive. Fire or explosion can cause severe burns or death. When adding fuel: • Turn engine OFF and let engine cool at least 2 minutes before removing. • Fill fuel tank outdoors or in a well ventilated area. • Do not overfill fuel tank. Fill tank to approxi mately 1-1/2 inches below top of neck to allow for fuel expansion. • Keep gasoline away from sparks, open flames, pilot lights, heat and other ignition sources.
FUEL TANKS, FITTINGS AND LIN ES Fuel System (050000, 118400) Removal 1. Disconnect breather hose ([A] Fig. 1) at rocker cover and remove air cleaner assembly. 2. Release clamp and disconnect tank hose at fuel shut-off valve ([B] Fig. 1). 3. Place hose in appropriate container and allow fuel to completely drai n from tank. 5 Fig. 1 1. Open carburetor bowl drain screw and drain remaining fuel into appropriate container. 2. Close bowl drain screw. 3.
3. Open carburetor bowl drain screw and drain remaining fuel into appropriate container. 4. Close bowl drain screw. 5. If equipped with metal key switch cover (Fig. 3), remove screws from cover and allow cover to hang from wiring. 12. Release clamp and disconnect hose from tank outlet fitting. Set aside. 13. Release clamp and disconnect hose at carburetor fitting. 14. Remove screw ([A] Fig. 5) and remove shut-off valve with spacer (B). Fig. 5 15. Drain any remaining fuel into appropriate container. 16.
Fig. 6 Fig. 8 3. Slide carburetor from its mounting studs and disconnect governor link ([A] Fig. 7) and anti-backlash spring ([B] Fig. 7) when carburetor is free. 4. Remove governor link and anti-backlash spring from governor lever ([C] Fig. 7) and set aside. 5 Fig. 7 5. Remove the carb spacer from the carburetor mounting studs. SEE SECTION 13- FINAL ENGINE ASSEMB LY. Inspect Fuel System. SEE SECTION 5- FUEL SYSTEM CLEANING AND INSPECTION.
11. Torque screws and nuts to values listed. 12. Position trim plate and install short screw on left side and long screw on right side. 13. Install separate control cover (if equipped) and torque screws to values listed. 14. Install throttle control kno b. 15. Position metal key switch cover (if equipped) and start all screws. 16. Torque mounting screws to values listed. 17. Add small amount of fuel to tank. 18. Open shut-off valve and check for leaks. 19. Install air cleaner assembly.
8. Install tank using long screw next to brake assembly and short screws underneath. 9. Torque screws to values listed. 10. Position brake assembly cover and install phillips screws to values listed. 11. Install hose assembly to tank fitting and carburetor fitting with new clamps. 12. Add small amount of fuel to tank, open shut-off valve, and check for leaks. 13. Start engine and check for leaks again. Fuel System (161400) Fig. 12 14.
10. Remove bo lts ([A] Fig. 15) that secure shut-off valve. Inspect Fuel System. SEE SECTION 5- FUEL SYSTEMS AND CARBURETION. Installation For torque values: SEE SECTION 14- ENGINE SPECIFICATIONS. 1. Install the carburetor assembly as shown in (Fig. 17). Fig. 15 11. Remove bo lts ([B] Fig. 15) that hold the choke bracket, air intake duct and carburetor. 12. While removing carburetor, disconnect governor link and anti-backlash spring. 13.
9. Fit left end of trim plate into slot in air cleaner base. 10. Start screws in holes along trim plate. 11. Torque screws to values listed. 12. Torque tank support screws above valve cover to values listed. 13. Install choke and th rottle control knobs. 14. Add small amount of fuel to tank. 15. Open shut-off valve. 16. Check for leaks. 17. Start engine and check for leaks again. 6. Loosen screw at hose clamp, if equipped, on control bracket. 7.
2. Disconnect the clamps at the carburetor fitting ([A] Fig. 21) and the crankcase ([B] Fig. 21). 3. Remove the bolts ([C] Fig. 21) that secure the pump to its mounting bracket. Fig. 20 2. While sliding carburetor on its mounting studs, install the governor link and antibacklash spring (Refer back to Fig. 20). 3. Install choke link. 4. Mount new gasket and air intake manifold and secure with two nuts. 5. Torque mounting nuts to values listed. 6. Install air filter housing and air filter. 7.
Fig. 25 Fig. 23 5 9. Whi le removing the carburetor, disconnect the governor link with anti-backlash spring (B) and the choke link ([C] Fig. 23). 10. Remove the two bolts that secure the air intake manifold to the crankcase ([A]Fig.24). Fig. 24 Installation 1. Make sure the seal is properly seated in the groove of the air intake manifold ([A] Fig. 25). 98 2. Install air intake manifold and torque bolts to values listed. 3.
CARBURETOR SERVICE PROCEDURES (050000, 085400, 086400, 115400, 117400, 1 18400, 104700, 1 61400, 185400, 260700, 261700) Some engines were built using both Nikki and Walbro carburetors. These carburetors have a fixed high spe ed main jet with adjustment screws for idle mixture and idle speed only. Be certain to use both the manufacturer and the carburetor number when ordering service parts. Service parts are available for both carburetors.
Fig. 31 Fig. 29 5 9. Remove screws (A) holding choke pl ate ([B] Fig. 32) and remove. The float hinge pin ([A] Fig. 30) is a wedge fit. 5. Tap the small end of the pin (B) with a center punch until it is loo se. 6. Remove pin (A) and remove the float ([C] Fig. 30) and inlet needle assembly. Fig. 30 7. Remove pilot jet (A) with Screwdriver # 19062. 8. Pry off the idle mixture valve limiter (B), if used. Remove the idle mixture screw and spring ([C] Fig. 31). 100 Fig. 32 10.
Fig. 35 To clean carburetor: Fig. 33 SEE SECTION 5- FUEL SYSTEMS AND CARBURETION. NOTE: Engines with type numbers not ending in A1 or E1 have removable idle and main air jets. Remove jets ([A] Fig. 34 ) with carburetor jet screwdriver (#19280). 5 Assembly Use new seals and gaskets when assembling carburetor. 1. Install plastic washer (B) on throttle shaft (A). 2. Install the throttle shaft in the carburetor body with flat ([C] Fig. 36) facing out. Fig. 34 11.
7. Install choke shaft ([A] Fig. 39) into carburetor. NOTE : Make sure the choke shaft retainer stop (B) is between the carburetor body stop (C) and the detent spring ([D] Fig. 39) in order to install the choke plate next. Fig. 37 5 4. Rotate throttle shaft to check for binding. Correct if required. 5. Place upper choke shaft bushing ([A] Fig. 39) on choke shaft (B) with the detents (C) facing away from the long choke lever arm (D) and the stop ([E] Fig. 38) facing the bottom of the shaft. 6.
Fig. 41 CAUTION: Emulsion tube ([A] fig. 42) must be installed before main jet (B) or damage to th e threads of the emulsion tube will result. Fig. 43 15. Install spring (A) to groove in fuel needle valve ([B] Fig. 44). 5 9. Install emulsion tube (A) with screwdriver #19061. Install main jet ([B] Fig. 42). Fig. 44 16. Slide fuel need le valve assembly (A) on tab (B) of float ([C] Fig. 45). Fig. 42 FOR MAIN JET AND PILOT JET IDENTIFICATION, SEE IDENTIFYING MAIN AND PILOT JETS ON PAGE 107. 10.
hinge (C) and both hinge pin posts ([D] Fig. 46). 21. Install float bowl gasket ([A] Fig. 48) to carburetor body groove. 22. Make sure the gasket does not twist or kink. Fig. 48 Fig. 46 5 19. Install the hinge pin. 20. Turn the carburetor body upside down. NOTE : The float (A) should be parallel to the 23. Position bowl drain ([A] Fig. 49 ) as shown. 24. Install float bowl (B), washer (C), and mounting screw (D), to carburetor. 25. Tighten screw ([D] Fig. 49) securely.
Type Numbers Not Ending In A1Or E1 Model Seri es 085400 115400** 115400* 117400 185400** 185400* ** Large A ir C leaner Standard Main Jet 71.3 75 75 81.3 93.8 91.3 High Altitude Main Jet 67. 5 72.5 72.5 78. 8 90 90 Standard Pilot Jet 42.5 45 42.5 42.5 40 37.5 *Small Air Cleaner Hig h Altitude Pilot Jet 40 42.5 37.5 41.3 35 35 Type Numbers Ending in A1 or E1 Model Seri es 085400 115400 117400 185400** 185400* ** Large A ir C leaner Standard Main Jet 67.5 75 81.3 91.3 91.3 High Altitude Main Jet 82.
3. Push float hinge pin (A) out of th e hinge posts (B). Remove float (C) and needle assembly ([D] Fig. 53). 4. The float hinge pin ([A] Fig. 53) is a slip fit. After Date Code 90042833 Remove the fixed main jet. Remove the main emulsion tube with Carburetor Jet Screwdriver, #19062. 6. Pry off the idle mixture valve limiter (if used). Remove the idle mixture scr ew and spring from carburetor body ([A] Fig. 55). 7. Remove pilot jet ([B] Fig. 55) with Jet Screwdriver #19062. 5 Fig. 53 5.
11. Remove air jets (if removable) on either side of the choke plate opening with Carburetor Jet Screwdriver # 19280. 12. Note the p osition of the throttle plate. 13. Remove the throttle plate screws (A). 14. Remove the throttle plate ([B] Fig. 57). Assembly Use new seals and gaskets when assembling carburetor. 1. Install throttle shaft seal ([B] Fig. 59) to carburetor body (A). Install seal with grooved side out, Fig. 59. 2. Place throttle shaft retainer (C) on throttle shaft (D).
Fig. 60 8. Connect one spring end ([A] Fig. 61) to the carburetor body (B), the other end (C) to the choke lever ([D] Fig. 61) to hold choke plate open. Fig. 62 9. Place choke plate ([A] Fig. 63) on choke shaft with stamped number (B) tow ard the fuel inlet nipple (C) side of the carburetor. 10. Secure with two screws ([D] Fig. 63). 5 Fig. 61 NOTE: Engines with type numbers not ending in A1 or E1 have removable idle and main air jets. Remove or install jets ([A] Fig.
Fig. 64 15. Slide fuel need le valve assembly (A) on to tab (B) of float ([C] Fig. 65). Fig. 66 17. Insert the float hinge pin (A) through the float hinge and both hinge pin posts ([B] Fig. 67). Center the hinge pin in the hinge pin posts. Fig. 65 16. Place float assembly ([A] Fig. 66) in carburetor. Fig. 67 18. Turn the carburetor body upside down. The floa t (A) should be parallel to the float bowl mounting surface ([B] Fig. 68).
Fig. 70 Identifying Main Jets (104700) Fig. 68 If not parallel: • Replace the fuel inlet valve, float and hinge pin. 5 19. Install the emulsion tube (A) and then the main jet ([B] Fig. 69). Model Series Standard Jet High Altitude Jet Before 100 92.5 90091033 After 107.5 102.5 90090933 Carburetor Service - Mikuni (161400) CAUTION: Do not use wires, drills or other devices to clean out metering holes and passages. NOTE : Use compressed air at a moderate Fig. 69 20.
Fig. 73 Fig. 71 Disasse mbly 1. Remove the float bowl mounting screw (C), washer (B) and float bowl ([A] Fig. 72). 4. Remove the pin, float and inlet needle assembly. 5. Remove fixed main (B) jet from end of fuel pick up tube first, Fig. 74, then remove the emulsion tube ([A] Fig. 74). 5 Fig. 72 2. Remove float bowl gasket (A). 3. The float hinge pin is a wedge fit. One end of float hinge pin has two flats ([B] Fig. 73). Tap the opposite end of the pin until loose. Fig.
Fig. 75 6. Remove pilot jet ([A] Fig. 76) with screwdriver # 19062. Fig. 77 9. Unhook the choke shaft spring. 10. Remove choke plate screws ([A] Fig.78). 11. Remove choke plate (B), shaft (C), spring (D), washers (if used),se al (E), bushings (F) Fig. 78). 5 Fig. 76 7. Pry off the idle mixture valve limiter ([A] Fig. 77). 8. Remove the idle mixture screw ([B] Fig.77). Fig. 78 NOTE: Engines with type numbers not ending in A1 or E1 have removable idle and main air jets.
15. Remove and inspect the bushing ([F] Fig. 80). Replace if worn or damaged. Remove or install jets ([A] Fig. 79) with carburetor jet screwdriver (#19280). 5 Fig. 80 To clean carburetor: Fig. 79 Note the position of the throttle plate. 12. Remove throttle plate screws ([A] Fig. 81) and remove plate (B). 13. Slide the throttle sha ft (C) out of the carburetor body. 14. Remove the throttle shaft seal (D) and washer (E). SEE SECTION 5- FUEL SYSTEMS AND CARBURETION. Inspect the idle mixture screw.
spring should hold the choke plate open Fig. 84. Fig. 81 5. Lay the throttle plate (A) on the shaft with the stamped numbers (B) to the left. Install two screws ([C] Fig. 82). Fig. 84 10. Place choke plate (A) on choke shaft with stamped nu mber(s) (B) facing opposite the fuel inlet (C). Attach with screws ([D] Fig. 85). 5 Fig. 82 6. Rotate throttle shaft to check for binding. Correct if required. 7. Install spring (A), washer (B), bushing (C) and seal (D) to choke shaft ([E] Fig. 83). 8.
Fig. 88 15. Slide fuel need le valve assembly (A) on to tab (B) of float ([C] Fig. 89). Fig. 86 12. Place emulsion tube (B) in fuel pick up first, then install fixed main jet ([A] Fig. 87) . 5 13. Install the emulsion tube (B) with jet screwdriver #19062, (C) and install the fixed main jet ([A] Fig. 87). Fig. 89 16. Place float assembly (A) in carburetor, Fig. 90. 17. Insert the small end of the float hinge pin (B) by hand until pin is through the float hinge (C) and both hinge pin posts (D), Fig.
Fig. 92 Fig. 90 18. Turn the carburetor body upside down. The floa t (A) should be parallel to the float bowl mounting surface ([B] Fig. 91). 22. Install idle mixture screw ( D) and spring Fig. 93. Turn screw in until it just seats. Do not tighten. 23. Back screw off 1-1/2 turns. 24. Install limiter ([E] Fig. 93), if used. 5 Fig. 91 If not parallel: • Replace the fuel inlet valve, float and hinge pin. 19. Position bowl drain as shown, Fig. 92. 20.
Identifying Main Jets (161400) Model Series Standard Jet High Altitude Jet Before 100 92.5 90091033 After 107.5 102.5 90090933 Fig. 94 These carburetors are equipped with two styles of choke shafts: • Plastic shaft with snap-in choke plate • Metal shaft with screw-mounted choke plate. Carburetor Service - Mikuni (260700, 261700) CAUTION: Do not use wires, drills or other devices to clean out metering holes or passages. To remove plastic choke shaft and plate: 1.
Disasse mble 1. Remove fuel bowl mounting screw (C) and washer (B). Remove the fuel bowl ([A] Fig. 95). Fig. 95 2. Remove float bowl gasket ([A] Fig. 96). 5 Fig. 97 5. Remove the main jet (A) from the fuel pick-up tube. 6. Remove the emulsion tube ([B] Fig. 98) with a carburetor jet screwdriver. Fig. 96 3. Remove float hinge pin (A), float ([B] Fig. 97), and inlet needle. Float hinge pin is a drive fit and one end of the pin has two flats. 4.
Fig. 101 Fig. 99 8. Remove idle mixture screw with spring ([A] Fig. 100). 11. Remove the air jets located on either side of the choke plate opening with carburetor jet screwdriver # 19280. 12. Note the position of the throttle plate for reinstallation. 13. Remove the throttle shaft screws ([B] Fig. 101)Remove the throttle plate. Low emissio n LMT carburetors with type numbers that end in A1 or E1 have pressed in pilot jets that are not removable. Do not remove the pressed in pilot jets ([A] Fig. 102).
shaft. Secure with two screws ([ G] Fig. 105). Fig. 103 15. Using carburetor nozzle screwdriver # 19280, remove main carburetor emulsion tube ([A] Fig. 104). Fig. 105 1. Install throttle shaft seal (A) to carburetor body. Install seal with grooved side out. 2. Place plastic throttle shaft seal (B) o n throttle shaft ([C] Fig. 106). 3. Install throttle shaft to carburetor body. 5 Fig. 104 TO CLEAN CARBURETOR: SEE SECTION 5FUEL SYSTEMS AND CARBURETION. Assembly 1. Assemble retainer ([A] Fig.
CARBURETOR SERVICE PROCEDURES (138400) Carburetor Service - Nikki (138400) CAUTION: Do not use wires, drills or other devices to clean out metering holes or passages. NOTE : Use compressed air at a moderate Fig. 107 6. Rotate throttle shaft to check for binding. Correct if required. pressure setting (5-7 PSI). Blow in both directions to clean out all openings and passages.
(D) and float bowl screw washer ([B] Fig. 109). Fig. 109 2. Remove float hinge pin (A), ca rburetor float (B) and float needle valve ([C] Fig. 110). Fig. 111 6. Remove screw ([A] Fig. 112). 7. Remove, throttle plate (B), throttle shaft (C) and seal ([D] Fig. 112). 5 Fig. 110 3. Remove main jet first ([A] Fig. 111) with a carburetor jet scr ewdriver. 4. Remove carburetor emulsion tube ([ B] Fig. 111). 5. Remove rubber plug ([C] Fig. 111). 122 Fig. 112 8.
Fig. 113 9. Remove idle speed screw ([A] Fig. 114). Fig. 115 5 TO CLEAN CARBURETOR: SEE SECTION 5FUEL SYSTEMS AND CARBURETION. Assemble 1. Install pilot jet ([A] Fig. 116). Fig. 114 10. Remove pilot jet ([A] Fig. 115). Fig. 116 2. Place new seal ([A] Fig. 117) lip down on the choke shaft (B).
(C) on choke lever detents ([D] Fig. 117). Rotate shaft closed. 3. Place choke plate (E) on choke shaft (B), secure with screw ([F] Fig. 117). Fig. 119 NOTE: For correct main jet and pilot jet identification and selection. Fig. 117 5 10. Insert the inlet needle (A) into the slot on the float ([B] Fig. 120). 4. Place new throttle shaft seal ([A] Fig. 118) on the throttle shaft (B). Insert in carburetor with throttle lever ([C] Fig. 118) set as shown. 5. Install idle speed screw ([D] Fig.
12. Place new float bowl gasket (A) in carburetor body groove, Fig. 119. 13. Place float bowl (B) on carburetor with drain boss parallel (C) to fu el inlet fitting ([D] Fig. 122). 14. Install new float bowl washer (E). Torque bowl screw ([F] Fig. 122) to values listed. NOTE : Use compressed air at a moderate pressure setting (5-7 PSI). Blow in both directions to clean out all openings and passages.
Fig. 126 15. Remove float hinge pin (A), float ([B] Fig. 127), and inlet needle. Fig. 124 5 8. Remove the throttle plate, throttle sha ft with lever. Remove the foam seal. 9. Remove the throttle shaft bushing from the carburetor body. 10. Rotate the choke shaft ([C] Fig. 125) to wide open. 11. Pull the choke plate ([D] Fig. 125) out of the choke shaft slot. Float hinge pin is a drive fit and one end of the pin has two flats. 16. Tap the end opposite the flats with a center pun ch ([C] Fig.
throttle lever should be to the left of the idle speed screw. 9. Rotate the throttle shaft CW until the idle stop is against the idle speed screw. 10. Place the throttle plate (L) on to the throttle shaft with the numbers (M) facing into the carburetor, on the right. 11. Place a drop of Loctite® on to the screw threads. Tighten the throttle plate screws ([N] Fig. 130). Fig. 128 2. Insert the spring inside the large foam seal. Slide the seal and spring on to the choke shaft ([G] Fig.
2. Place a new bowl gasket on the carburetor body. 3. Place the bowl on the carburetor. Install the float bowl screw. 4. Torque the screw to values listed. Identifying Main Jets (235400, 245400, 28Q700) 5 Model Series Standard Jet High Altitude Jet 235400 497570 497571 245400 498172 498172 28Q700 231858 231850 Fig. 131 Disasse mbly 1. Remove fuel bowl screws (G) and separate fu el bowl (H) and solenoid (E) from the carburetor body ([I] Fig. 132).
9. Remove two screws (A) and throttle plate (B) and pull the throttle shaft ([C] Fig. 136) from the carburetor body. Fig. 133 6. Remove the float base gasket ([M] Fig. 134) from the carburetor body. Fig. 136 10. Remove the idle mixture screw with spring (D) and the idle speed screw with spring ([E] Fig. 137). 5 Fig. 134 7. Press down on the main jet ([N] Fig. 135) to remove it from the float base tube. 8. Replace the float base if it shows signs of wear or damage.
Assembly 1. If separated, place the throttle return spring ([A] Fig. 140) inside the large foam seal (B). 2. Slide the seal and spring on to the choke shaft (C) with the top of the spring (D) contacting the choke shaft lever ([E] Fig.140). 3. Turn the choke shaft ccw while gently pushing it into the carburetor body until the bottom end of the spring ( A) rests on the back of the spring perch ([F] Fig. 140). Fig. 138 CAUTION: This carburetor has pressed-in jets that are not serviceable.
The dimples position the choke plate on the shaft. Fig. 144 Fig. 142 8. Install small foam washer (J) to throttle shaft (K). 9. Install throttle shaft to the carburetor body. 12. Install idle mixture screw ( O) with spring and the idle speed screw ([P] Fig. 145) with spring . 13. Turn each screw until the head of the screw touches the spring. 10. Turn throttle shaft until flat ([L] Fig. 143) is facing out. 5 Fig. 145 Fig. 143 NOTE: The holes in the throttle plate are offset.
20. Insert the spring ([Y] Fig. 150) to the bottom of the float assembly. Fig. 146 18. Place gasket (U) on carburetor body ([V] Fig. 147). 5 Fig. 149 21. Place the fuel bowl (A) on the carburetor base ([B] Fig. 150). 22. Fasten with scr ews ([C] Fig. 150). 23. Install solenoid (D) and washer ([E] Fig.150). 24. Torque solenoid to values listed (Fig.150). Fig. 147 NOTE : The l ocating tang (W) on the float assembly must be placed in the recess ([X] Fig. 148) of the carburetor base as shown. 19.
SECTION 6 - GOVERNOR SYSTEMS MECHANICAL GOVERNOR SYSTEMS........................................................ 135 Governor System Operation (Typical) ..................................................................... 135 Governed Speed (RPM) Limits ................................................................................ 136 GOVERNOR COMPONENTS (050000, 118400) .......................................... 136 Governor Component Removal ...........................................................
6 134
MECHANICAL GOVERNOR SYSTEMS series of interconnecting linkages and springs ([D] Fig. 3). Governor System Operation (Typical) A governor system operates by transmitting engine RPM through a pair of flyweights (A) th at retract and extend a sliding cup ([B] Fig. 1). Fig. 1 The end of the cup is in contact with the paddle (A) of the governor crank ([B] Fig. 2). 6 Fig. 3 The purpose of the governor system is to maintain a desired engine speed (RPM) in spite of the changing loads imposed on the engine.
Governed Speed (RPM) Limits In order to comply with specific top governed speed limits, Briggs & Stratton supplies equipment manufacturers (OEM)s with engines that have adjustable top speed limits. These limits are set to OEM specifications. The top no-load speed limit will allow no more than the desired top governed speed limit when the engine is operated on a rig id test stand at our factory. However, the design of the equipment being powered can affect engine speeds.
11. Tap the shaft through the cylinder housing with a small punch or equivalent (Fig. 8). Fig. 6 6. Remove cylinder cover. See SECTION 10- CYLINDERS, COVERS AND SUMPS. 7. Rotate the engine crankshaft so the counter weight ([J] Fig. 7) is in position shown. 8. Remove the spring clip from the governor crank. 9. Push governor crank ([A] Fig. 7) down into the cylinder housing and remove. Fig. 8 The entire assembly will come free of the housing. 6 Governor Component Inspection 1.
Governor Component Installation 1. Make sure the flyweights, spool and gear move freely. 2. Set thrust washer (if used) on th e shaft of the governor gear ([A] Fig. 9). 5. Install E-clip ([A] Fig. 11) on governor crank and push crank up through cylinder housing and install thrust washer. Make sure the paddle of the governor shaft rests on the face of the governor cup. Fig. 11 Fig. 9 6 3. Press the governor shaft through its mounting hole in the cylinder until it bottoms on the face of the washer (Fig.
13. Ensure that you can feel the governor crank paddle make contact with the governor cup on governor gear. 14. While holding the paddle against the governor cup, tighten the upper locknut. 15. Reinstall any other components you removed, 16. Perform static adjustment. See SECTION 1- SAFETY, MANTENANCE AND ADJUSTMENTS. 4. Rotate crankshaft ([I] Fig. 14) as necessary for adequate clearance to remove governor crank (F).
10. Remove thrust washer. Fig. 16 Governor Component Inspection See SECTION 6- GOVERNOR SYSTEMS. Governor Gear Shaft - Remove and Replace 1. Press governor gear shaft (K) out of cylinder cover from outside, Fig. 17. 6 Fig. 18 Governor Component Installation 1. Place thrust washer on governor gear shaft. 2. Place governor gear weights (if removed) in governor cup and place assembly on governor gear shaft. 3. Push assembly down until gear snaps into groove on governor gear shaft. 4.
9. Install lower nut (C) on governor crank (F) with serrations UP until nut bottoms on threads of the crank. Tighten nut (left hand threads), Fig. 19. 10. Place governor lever (B), on governor crank (F). 11. Install top nut ([A] Fig. 19) with serratio ns down on l ever. 12. Hold paddle of governor crank against cup of governor gear while tightening top nut (left hand threads). Fig. 21 NOTE : 60 Hz generators use the outer hole ([P] Fig.
5. Inspect bushing for burrs or foreign materi al. f35p15 Fig. 22 5. Remove spring clip ([A] Fig. 23). 6. Push governor crank down through cylinder and out of bearing. 7. Pry out governor crank seal. Do not damage seal bore. Discard seal. Fig. 24 If discrepancies are found: • Replace the go vernor gear as a complete assembly. If the shaft bushing is damaged or worn: • Replace bushing. 6 f34p14 Governor Crank Bushing Replacement Fig. 23 Governor Component Inspection Refer to (Fig. 24). 1.
4. Thoroughly clean away all chips and cutting debris. Fig. 27 Fig. 25 Governor Component Installation 1. Press in new seal. 2. Slide governor crank ([A] Fig. 26) up through the bushing and position as shown in the appropriate illustration. 6 CAUTION: Ensure that governor crank is in the position illustrated. (Fig. 26) (Fig. 27) and (Fig. 28) If it is not, proper governor adjustments cannot be made and will result in over-speeding and engine damage. Fig. 28 3. Install washer and spring clip.
4. Install governor gear. Ensure that counterweights ([A] Fig. 30) move freely without binding. Fig. 30 5. Install cylinder cover or sump. See SECTION 10- CYLINDERS, COVERS AND SUMPS. NOTE: (161432 Type 0080-01) When 6 assembling governor lever assembly (A), ensure that tab on strike plate ([B] Fig. 31) is between upper and lower half of lever clamping area. Fig. 31 6. Re install any components you removed to gain access to the cylinder cover. 7. Perform a static adjustment.
SECTION 7 - CYLINDER HEADS AND VALVES ROCKER ARM ASSEMBLIES ....................................................................... 147 Remove Rocker Arm Assembly (050000, 118400).................................................. 147 Remove Rocker Arms (085400, 086400, 115400, 117400, 138400, 185400) ........147 Remove Rocker Arm Assembly (235400, 245400).................................................. 147 Remove Rocker Arms (104700, 161400, 260700, 261700, 28Q700) .....................
CYLINDER HEAD ASSEMBLY ..................................................................... 153 Install Push Rod Guides and Studs (085400, 104700, 115400, 117400, 118400, 28Q700) .................................................................................................................1 53 Installing Valve Springs & Retainers (050000, 235400, 245400) ........................... 154 Install Valve Springs And Retainers (104700, 28Q700) ...................................................................
Remove Rocker Arms (085400, 086400, 115400, 117400, 138400, 185400) ROCKER ARM ASSEMBLIES Remove Rocker Arm Assembly (050000, 118400) 1. Remove the jamb nut (A) from the rocker arm stud. 2. Remove the rocker arm pivot (B) from the studs and remove the rocker arms ([C] Fig. 2). 1. Remove the four bolts ([A] Fig. 1) that mount the rocker arm assembly to the cylinder head. 050000 Fig. 2 3. Remove valve stem caps (if equipped ) and push rods (D). 4. Remove rocker stud (E) and push rod guide ([F] Fig. 2).
6. Remove valve adjusting screw and nut ([F] Fig. 4) from rocker arm. 4. Remove rocker arm studs (D) and push rod guides ([E] Fig. 5), if equipped. Fig. 5 Fig. 4 Remove Rocker Arms (104700, 161400, 260700, 261700, 28Q700) 7 1. Loosen rocker arm set screws ([A] Fig.5). 2. Remove rocker arm nuts ( B), and rocker arms (C). 3. Remove push rods and note the following: 104700, 161400: • Push rods are identical. 260700, 261700: • The intake push rod has center section that is made of aluminum and is hollow.
Remove Cylinder Head (104700, 161400, 260700, 261700) 3. Make note of an y discrepancies and discard old head gaske t. 1. Remove head bolts ([A, B, C & D] Fig.7) and cylinder head. NOTE : Engines manufactured before 940501xx were equipped with sealing washers under cylinder head bolts (A) and ([C] Fig. 7). 2. Remove and discard head gasket. Fig. 8 7 Fig. 7 Remove Cylinder Head (28Q700) 1. Remove head bolts ([A] Fig.8) and cylinder head. 2. Remove and discard head gasket.
VALVES Remove Valves (050000, 086400, 118400, 104700) 1. Place cylinder head on a solid and flat work surface. 2. Bundle a rag under the face of the valve being removed. 3. With a small socket mounted on a drive handle, push the valve retainer down from the direction of the open slot as shown in ([A] Fig. 9). 4. Follow the sequence shown ([B & C] Fig.9). Remove Valves (085400, 086400, 115400, 117400, 138400, 185400, 161400, 260700, 261700, 28Q700) 1. Place cylinder head on a solid and flat work surface. 2.
INSPECT CYLINDER HEAD COMPONENTS 3. If an area is questionable, use a feeler gauge to measure the amount of distortion as shown in Fig. 13. Inspect Push Rods (All Models) Check pushrods for straightness as shown in Fig. 11. Fig. 11 Replace if bent. Inspect Head For Distortion (All Models) 1. Clean the mating surface of the cylinder head. 2.
Inspect Valve Stem / Valve Guide Tolerance (All Models) 1. Measure the valve stem at the locations illustrated in ([A & B] Fig. 14). Fig. 14 Reface Valves and Seats (All Models) Valve faces can be resurfaced using a commercially available valve grinding tool. Briggs & Stratton does not recommend this practice as a high quality repair procedure. • Replace damaged or worn valves. For specifications relating to the engine you are working on, see SECTION 14- ENGINE SPECIFICATIONS. 1.
4. Replace valve seat if dimension ([B] Fig. 16) is less than 1/64” (.4mm). Fig. 16 Replace broken, distorted, or worn valve springs. Fig. 18 CYLINDER HEAD ASSEMBLY Install Push Rod Guides and Studs (085400, 104700, 115400, 117400, 118400, 28Q700) If push rod guide was removed: 1. Place push rod guide (A) in cylinder head with word “TOP” (except 104700) toward Mag. side of cylinder head, Fig.17 or 2. Coat rocker arm stud threads with Loctite #242 sealant. 3. Install rocker arm studs.
Two piece valve stem seals were used on early production intake valves (28Q700), Fig. 19. Be sure Valve Guide Lubricant #93963 is not on valve face, valve seat, or exposed end of valve stem. • Gasket seal or washer is used on intake valve only, (085400, 115400, 117400, 118400, 185400, 235400, 245400, 28Q700). Installing Valve Springs & Retainers (050000, 235400, 245400) 1. Install the oil splash guide in the rocker box (if equipped) as shown in Fig. 21. Fig.
Make sure the keeper is completely seated in the groove of the valve stem. • Repeat this process for the remaining valve. 3. Place retainer on spring. Use Valve Spring Compressor, #19347 ([A] Fig. 24) to press on retainer and compress spring. Install Valve Springs And Retainers (104700, 28Q700) 1. Place a shop rag or wood blocks on work surface to support valves. Place cylinder head on rag or blocks and install valve spring over valve stem. 2. Place retainer (A) on spring.
• Fig. 31 ( 138400) Torque cylinder he ads in three steps: For example: For final torque of 220 lb-in. (25 Nm) : • First step 75 lb-in. (9 Nm) • Second step 150 lb-in. (17 Nm) • Final step 220 lb-in. (25 Nm) 1 4 2 3 CAUTION: Do not tighten any screw to the final torque before all screws have been tightened to the second step. Uneven tightening may warp the cylinder head. Fig. 27 4 1 3 1 3 5 7 4 2 2 Fig. 28 Fig. 25 1 1 4 3 3 2 Fig. 26 156 4 2 Fig.
INSTALL ROCKER ARMS 2 5 4 Install Push Rods & Rocker Arms (104700, 161400, 260700, 261700, 28Q700) 8 6 3 1 7 1. Install push rods (A) through push rod guide. Make sure push rods are seated in valve tappets ([B] Fig. 32). Fig. 30 1 3 4 2 Fig. 31 Fig. 32 2. Remove all lubri cant from end of valve stems. 3. Place valve caps ([C] Fig. 33), (when used) on end of valve stems. 4. Place rocker arms on studs. Install rocker arm nuts (D) and screw while holding rocker arm against valve cap ( [C] Fig.
Install Push Rods & Rocker Arms (235400, 245400) 6. Tighten the jamb nut without moving the adjustment screw. 1. Install push rods. Be sure each push rod is seated in its tappet. 2. Place rocker arm shaft assembly on cylinder head making sure that push rod sockets engage valve adjusting screws. 3. Install two screws ([A] Fig. 34) in rocker arm shaft and cylinder head. • Torque screws as listed. See SECTION 14ENGINE SPECIFICATIONS. Fig. 35 7.
5. Adjust as required. Fig. 36 6. When valves are adjusted, hold rocker nut and tighten rocker ball screw or nut to torque listed. 7. Recheck clearance and adjust, if required.
7 160
SECTION 8 - STARTERS REWIND STARTERS………………………... ................................................. 163 Remove Rewind Starter Housings (Typical) ............................................................163 Install Rope And Handle Assembly. .........................................................................1 66 Disassemble Rewind Starter (161400, 235400, 245400) ........................................166 Inspect Rewind Starter (161400, 235400, 245400) ...............................................
8 162
REWIND STARTERS Install Rope And Handle Assembly Handles With Inserts Remove Rewind Starter Housings (Typical) 1. Remove four screws (A) holding rewind starter housing ([B] Fig. 1) and remove. 2. If riveted, drill through rivets. Clean all debris. NOTE : Some units do not use an insert in the handle. 1. To determine proper length of starter rope, see SECTION 14- ENGINE SPECIFICATIONS. Cut as necessary. 2. Insert rope (A) through starter handle (B) and starter handle insert (C). 3.
Disassemble Rewind Starter (115400, 117400, 118400, 138400, 185400, 260700, 261700) WARNING 9. Wiggle pulley until spring comes free of its anchor. 10. Carefully lift out pulley and spri ng assembly, (Fig. 5). NOTE : Do not remove spring from pulley. Pulley and spring are serviced as an assembly. Eye injury could occur if flywheel is struck with a hard object. • Do not strike flywheel with hard object or steel tool. • Wear safety goggles or other eye protection. 1.
4. Position springs (A) over posts (B) in pulley. Install pawls ([C] Fig. 9). Assemble Rewind Starter (115400, 117400, 118400, 138400, 185400, 260700, 261700) 1. Lay starter housing flat on work bench. 2. Position pulley and coil spring assembly (A) over center pivot post ([B] Fig. 7) in starter housing. Fig. 9 Fig. 7 3. Rotate pulley counterclockwise until slight resistance is felt, indicating that spri ng is engaged in spring tab, (Fig. 8). 5.
Disassemble Rewind Starter (161400, 235400, 245400) 1. Pull starter rope out as far as it will go. 2. Lock pulley to prevent it from retracting in starter housing. 3. Extract rope at pulley and cut off knot. 4. Remove rope and handle from rewind starter. 5. Unlock pulley and slowly release spring tension. 6. Inspect rope for fraying and broken strands. Replace if worn. 10. Lift out pulley. The starter spring cup (D) will normally remain in starter housing ([E] Fig. 12).
Inspect Rewind Starter (161400, 235400, 245400) 1. Inspect starter pulley for cracks, rough edges, wear or bu rrs in pulley groove (A), wear on spring cup lugs (B) and center hole ([C] Fig. 14). Replace pulley if damaged or worn. Fig. 14 Assemble Rewind Starter (161400, 235400, 245400) 1. Place spring and cup in pulley, with outer end of spring (A) between two wide spaced lugs (B) in pulley and spring cup projections ([C] Fig. 16) next to the two wide spaced lugs. Fig. 16 2.
8. Insert rope through housing and hole in pulley. 9. Secure rope to pulley with overhand knot. 10. Remove pu lley lock and allow spring to slowly retract rope into rewind starter assembly. 11. Install handle. See SECTION 8- Fig. 3. Fig. 18 4. Install paw ls (A) and pawl springs ([B] Fig. 19) in pully. 5. Install retainer spring (A), retainer (B), washer (C) and retainer screw ([D] Fig. 19). Disassemble Rewind Starter With Metal Pawls (104700) WARNING 6. Rotate pully ([A] Fig.
9. Remove brake spring (C). 10. Rotate pulley and spring assembly ([D] Fig. 22) until pulley feels free. 11. Lift out pulley and spring assembly. NOTE : Pulley and spring with retainer are serviced as an assembly. Do not remove spring retainer fr om pulley. Fig. 24 Assemble Rewind Starter With Metal Pawls (104700) 1. Note the location of the free end of the spring in the pulley assembly and of the inner spring retainer ([A] Fig. 25) in the starter housing. Fig.
4. Install pawls (A), pawl springs (B), and brake spring ([C] Fig. 26). 9. Insert rope through housing and hole in pulley. 10. Secure rope to pulley with overhand knot. See SECTION 8- FIG. 3. 11. Remove pu lley lock and allow spring to slowly retract rope into rewind starter assembly. Disassemble Rewind Starter (28Q700) NOTE : If problems are encountered with the Fig. 26 5. Place retainer (A) on brake spring and partially tighten retainer screw ([B] Fig. 27.
Assemble Rewind Starter (28Q700) 8. Install rope. 1. Straighten spring to allow easier installation and restore tension. 2. Oil spring. 3. Insert either end of spring into blower housing slot and hook into pulley (A). 4. Place a dab of grease (B) on steel pul ley. 5. Set pulley into housing. Bend tang down. Adjust tang gap to 0.063 i n. (1.6 mm) ([C] Fig. 29). Depress pulley fully into rewind housing when measuring tang gap. Fig. 31 9. Insert rope through housing and hole in pulley. 10.
Fig. 34 Fig. 33 NOTE: Some engines are equipped with an OEM supplied electric starter. Contact the OEM for service information and adjustment procedures. Ring Gear Replacement Briggs & Stratton engines use an aluminum, plastic or steel ring gear that is attached to the flywheel. Replace the ring gear if it shows wear or damage. Some ste el ring gears are pressed or heat shrunk to the flywheel. These ring gears are not replaceable.
Starter Drive (104700, 161400, 260700, 261700) Disassemble Starter Drive (Roll Pin Retainer) 1. Place starter drive retainer on support block and drive out rol l pin ([A] Fig. 36) to remove starter drive. CAUTION: Do not oil pinion gear on clutch helix. 3. Wash the parts in solvent. Assemble Starter Drive NOTE : Use new roll pin when assembling starter drive . Fig. 36 2. Remove cover (B), upper spring retainer (C), spring (D), clutch retainer (E), washer (F), pini on gear (G) and clutch ([H] Fig. 37).
Starter Drive (235400, 245400) Disassemble Starter Drive (Snap Ring Retainer) 1. Remove dust cover (A). 2. Push down on upper spring retainer (B) to expose snap ring ([C] Fig. 39) on shaft. Fig. 38 Inspect Starter Drive 1. Inspect the pinion gear and clutch ([D] Fig. 38) for damaged teeth. Some pinion gears use a rubber bottom as part of the clutch. If clutch rubber inside pinion gear is worn or damaged, pinion gear will slip when starter is engaged. • Check for wear or damage. 2.
6. Remove upper spring retainer (B), return spring (G), lower retainer (H), pinion gear (I), and starter clutch ([J] Fig. 39). Starter Drive (28Q700) Inspect Starter Drive 1. Inspect the pinion gear (I) for damaged teeth. Some pinion gears use a rubber bottom as part of the clutch. If clutch rubber inside pinion gear is worn or damaged, pinion gear will slip when starter is engaged. • Check for wear or damage. Correct any sticking betwee n pinion gear and starter shaft helix ([K] Fig. 39).
Inspect Starter Drive 1. Inspect the pinion gear ([E] Fig. 42) for damaged teeth. Some pinion gears use a rubber bottom as part of the clutch. If clutch rubber inside pinion gear is worn or damaged, pinion gear will slip when starter is engaged. • Check for wear or damage. 2. Correct an y sticking between pinion gear and starter clutch (F) helix, Fig. 42. CAUTION: Do not oil pinion gear on clutch helix. 3. Wash the parts in solvent. 4. The pinion gear (E), clutch (F), and C-ring ([A] Fig.
SECTION 9 - LUBRICATION SYSTEMS SYSTEM TYPES……………………………. ................................................... 179 Oil Dipper (050000, 085400, 086400, 115400, 117400, 138400, 185400, 235400, 245400) ......................................................................................................179 Oil Dipper (161400) .................................................................................................. 179 Oil Slinger (28Q700) ................................................................
9 178
SYSTEM TYPES For information regarding external breather systems: See SECTION 3- ENGINE DISASSEMBLY. Briggs & Stratton OHV engines use four lubrication systems. 1. Oil Dipper 2. Oil Slinger 3. Pressure Filtration 4. Pressure Lubrication Oil Dipper (050000, 085400, 086400, 115400, 117400, 138400, 185400, 235400, 245400) f23p11 Fig. 2 Oil Slinger (28Q700) The oil slinger (A) i s driven by the camshaft ([B] Fig. 3). The dipper ([A] Fig. 1) is an integral part of the connecting rod cap.
Pressure Lubrication (104700, 260700, 261700) Pressure Filtration Fig. 6 OIL PUMP SERVICE Fig. 4 Oil Pump & Screen Removal/ Installation (104700, 260700, 261700) The oil pump can be accessed from the outside of the sump. Oil Pump Removal/Installation (104700) 1. Remove the three screws that hold the oil pump cover to the sump. The O-ring that seals the cover is held in a channel machined into the sump ([A] Fig. 7). 9 Fig. 5 Fig.
2. Lift the pump rotor and its drive shaft from the sump ([A] Fig. 8). 2. Remove snap ring ([A] Fig. 10) retaining inner rotor to shaft. f32p15 Fig. 8 3. Remove the outer oil pump rotor ([A] Fig.9). Fig. 9 4. Remove the O-ring and discard. 5. Inspect the O-ring channel, inner and outer pump rotor an d the drive shaft for any signs of wear or damage. Replace if worn or damaged. 6. Coat all parts with new oil and rei nstall. 7. Install cover and torque bolts to listed value.
Oil Screen Removal/Installation (104700) The oil pump screen is located inside the sump. Remove sump from cylinder to clean or replace the screen. 1. Remove two screen retaining screws ([A] Fig. 12). Clean or replace as needed. Fig. 14).Press screen into position as shown. Fig. 14 Oil Pump & Screen Removal/ Installation (28Q700) Fig. 12 2. Install screen and torque screws to listed value. See SECTION 14- ENGINE SPECIFICATIONS.
Slide screen out from its cavity. Clean and/or replace. Current oil pump screen (After date code 98063000) requires the sump be removed from the engine. Drive the screen out from the outside of the sump cover (Fig. 17). Oil Pump Removal/Installation (28Q700) All three oil pump configurations can be removed from the outside of the sump. With slight variations of the O-ring channel and design of the pump cover, the removal and installation procedure is essentially the same. All Date Codes (28Q700) 1.
After Date Code 98063000 (28Q700) 1. Install new O-ring ([A] Fig. 21) in channel in sump. Before 94110700 (28Q700) 1. Install O-ring ([A] Fig. 23) to groove in sum p. 2. Place pump cover on oil pump cavity, and install three screws. 3. Torque to listed value. Fig. 21 2. Install cover and torque bolts to listed value. See SECTION 14- ENGINE SPECIFICATIONS. After 94110600 (28Q700) 1. Install O-ring ([A] Fig. 22) to groove in sum p. 2. Place pump cover on oil pump cavity.
Low oil will cause contact between the cylinder housing and a shaft attached to a float. The sensor assembly is show n with the shaft ([A] Fig. 24) grounding against the cylinder housing. OIL GARD® (161400) For Troubleshooting information: See SECTION 2- TROUBLESHOOTING, pg.55. Oil Gard® System (161400) Fig. 24 When the switch is submerged in oil, the shaft is lifted and no longer makes contact with the cylinder. An O-ring provides a seal between the cylinder housing and the terminal ([Fig. 25] A & B).
Disassemble Oil Gard® System (161400) 1. Disconne ct wire (A) from float assembly terminal and remove mounting screws ([B] Fig. 28). f61p28 Fig. 28 2. Remove float assembly ([A] Fig. 29) from cylinder. 9 f62p28 Fig. 29 To service warning light, 1. Disconnect wire connector and remove light from control panel. 2. Remove air cleaner to gain access to light (if so equipped). 186 Inspect Oil Gard® System (16140 0) 1. Inspect float assembly for cracks in housing and float. 2.
SECTION 10 - CYLINDERS, COVERS AND SUMPS REMOVING COVERS AND SUMPS ............................................................. 189 Removal: (All Models) ..............................................................................................1 89 Crankshaft Seals (All Models)..................................................................................189 BEARINGS .....................................................................................................
10 188
REMOVING COVERS AND SUMPS Removal: (All Models) Before removing a cover or sump from engine, remove rust, paint, or burrs from the PTO end of the crankshaft. 1. Drain the oil from the engine. 2. Remove the cover or sump bolts (Fig. 1). Crankshaft Seals (All Models) Oil seals are a press fit in cylinder and sump covers. Oil Seal Removal (All Models) Pry the old se al out of its mounting (Fi g. 2), using a screwdriver. If cover or sump sticks: • Tap lightly with soft mallet on alternate sides of cover.
Use the following plug gauges to check cam bearings: • 161400 - Gauge #19383 • 104700 - Gauge #19164 (Magneto-Side) • 260700, 261700 - Gauge #19383 • 28Q700 - Ga uge #19164 Insert the gauge ([A] Fig. 3) into the beari ng at several locations. If the plug gauge can be inserted 1/4 in. (6.35 mm) or more: • Replace cylinder, cover or sump. Ball Bearing Service (085400, 086400) Removal: Magneto-Side Ball Bearing Bearing Removal Tools: (Refer to Fig.
Installation: Magneto-Side Ball Bearing Bearing Installation Tools: (Refer to Fig. 5). • Adapter/Driver ([A] #19397) • Driver ([B] #19320) • Washer ([C] #225136) • Puller Screw ([D] #19318) • Pilot Nut ([E] #19395) 1. Lubricate outside of ball bearing. 2. Insert adapter/driver (A) into driver (B) and place ball bearing on adapter. 3. Assemble washer (C) to puller screw (D) and insert through bushing. 4. Insert small end of pilot nut (E) in oil seal boss in cylinder. 5.
5. Tighten screw until bearing is seated. Fig. 7 Installation: Magneto-Side Ball Bearing Bearing Installation Tools: (Refer to Fig. 9) • Support ([A] #19394) • Washer ([B] #225136) • Puller Screw ([C) #19318) • Pilot ([D] #19396) 1. Lubricate outside of ball bearing. 2. Place ball bearing on support (A). 3. Assemble washer (B) to puller screw (C) and insert through pilot (D). 4. Insert puller screw (C) with small end of pilot (D) into cylinder and thread into support (A).
5. Insert puller screw (B) w ith driver (C) through ball bearing and thread into support (D). Fig. 10 6. Tighten until ball bearing is seated. Removal: PTO-Side Ball Bearing (With 6:1 Gear Reduction) Bearing Removal Tools: (Refer to Fig. 12). • Puller Nut ([A] #19139) • Puller Stud ([B] #19398) • Support ([C] #19454) • Washer ([D] #225136) • Nut ([E] #94814) 1. Remove governor gear. 2. Assemble puller nut (A) to puller stud (B) and insert through ball bearing. 3. Place support (C) over ball bearing. 4.
2. Using arbor press and tool ([A] #19320). Fig. 13 Installation: Magneto-Side Ball Bearing Bearing Installation Tools: (Refer to Fig. 15) • Washer ([A] #225136) • Puller Screw ([B] #19318) • Pilot ([C] #19396) • Support ([D] #19394) 1. Lubricate outside of bearing. 2. Place ball bearing on support (D). 3. Assemble washer (A) to puller screw (B). 4. Insert small end of pilot (C) into seal boss in cyl inder. 5. Insert puller screw (B) through pilot (C) and thread into support (D). 6.
Ball Bearing Service Counter-Balance (185400) Fig. 16 Installation: PTO-Side Ball Bearing Bearing Installation Tools: (Refer to Fig. 17). • Washer ([A] #225136) • Support ([B] #19394) • Puller Screw ([C] #19318) • Pilot ([D] #19396) 1. Lubricate outside of bearing. 2. Install shim(s) - if used. 3. Assemble washer (A) to puller screw (C). 4. Insert large end of pilot (D) into seal boss of cover. 5. Insert puller screw (C) through pilot (C) and thread into support (B).
Installation: Counter-Balance Ball Bearing Bearing Installation Tool: (Refer to Fig. 19) • Driver ([A] #19320) 1. Oil outside of ball bearing. 2. Using an arbor press and driver (A), press ball bearing until it is seated. Fig. 19 2. Assemble washer (A) to puller screw (B) and insert through large end of driver (C). 3. Place open side of support (D) against ball bearin g. 4. Insert puller screw (B) w ith driver (C) through ball bearing and thread into support (D). 5.
2. Remove oil seal. 3. Assemble washer (A) to puller screw (B) and insert through large end of driver. 4. Assemble second washer (A) over puller screw (B) up against driver (C). Fig. 23 Fig. 22 5. Place open side of support (D) against ball bearing with notch (E) of support (D) over two ribs in cylinder cover. 6. Insert puller screw (B) w ith driver (C) and washer (A) through ball bearing and thread into support (D). 7. Tighten until ball bearing comes free of cylinder cover. 2.
Installation: Magneto-Side DU Bearing 1. Place cylinder on cylinder support tool (#19351). 2. Position new bushing against counterbored bearing with the oil hole aligned with hole (B) in the side of the bore ([A] Fig. 25). 3. Press the new bearing (A) into place. Removal: PTO Ball Bearing 1. Remove oil seal . 2. Support the cylinder cover on arbor press and press out bearing using bushing (A) driver (#19226). Press be aring to the inside of the cover Fig. 27. Fig. 27 Fig. 25 4.
If measurement exceeds specified dimension: • Place split of bearing seam ([A] Fig. 30) as shown. • Replace cylinder and/or sump. Aluminum Bearing Service (260700, 261700) Measure magneto-side be aring and PTO beari ng with plug gauge (#19378) or compare measurements with reject size dimension. See SECTION 14- ENGINE SPECIFICATIONS. If measurement exceeds specified dimension: • Replace cylinder and/or sump. DU™ & Ball Bearing Service (28Q700) Removal: Magneto -Side DU™ Bearing 1. Remove oil seal. 2.
PTO-Side Ball Bearing If the measurement obtained from the sump cover bearing exceeds limitations: • Replace sump. Installation: Cylinders and Covers And Sumps (All Models) Make sure the mating surfaces of the cylinder and cover or sump are clean. 1. Place the gasket ([A] Fig. 33) on the mating surface of the cylinder. INSTALLING COVERS AND SUMPS Seal Protectors (All Models) Use a seal protector to prevent damage to oil seals when installing covers or sumps. 10 Tool# Color Size 19334/1 White .
Fig. 37 Fig. 34 Fig. 38 Fig. 35 10 Fig. 39 Fig.
CRANKSHAFT END PLAY When cylinder cover or sump is installed with a standard gasket, end play should be as listed in SECTION 14- ENGINE SPECIFICATIONS. Always measure end play with a standard gasket in place. If end play is less than listed: • Use additional gasket(s) between the oil sump and cylinder to get proper end play. If end play is more than listed: Fig. 40 • Use Part #220624 shim on magneto end of crankshaft ([A] Fig. 43 non-pump applications) or on PTO end of crankshaft ([B] Fig.
CYLINDER BORES Resizing Cylinder Bores Inspect the cylinder whenever the engine has been disassembled. Look for cracks, stripped bolt holes, broken fins or any evidence of cylinder wall damage or wear. A cylinder bore may be resized to 0.020 in. (0.51 mm) over the standard size shown in the engine specifications. See SECTION 14- ENGINE SPECIFICATIONS. If done accurately, the corresponding 0.020 in. (0.51mm) oversize rings and pistons will fit correctly and maintain proper clearances.
Fig. 46 If using hand drill to hone: • Clamp the cylinder and honing fixture in a vise at a convenient working height. If using drill press: • Oil the surface of the drill press table liberally. Set (do not anchor) the honing fixture/plate (A) and cyl inder on dril l press table.([B] Fig. 47). Fig. 47 4. Select hone set as mentioned earlier. 5. Place hone in middle of cylinder bore. 6. Tighten adjusting knob with finger or small screwdriver until stones fit snugly against cylinder wall. Do not force. 7.
travel area, (D) use this area to guide hone to straighten cylinder bore, Fig. 47. 10. Start the drill and, as the hone spins, move it up and down limiting the travel to the bottom of the cylinder ([E] Fig. 47). 11. As the bottom of the cylinder increases in diameter, gradually increase the length of the strokes until hone travels full le ngth of bore and extends past the cylinder bore ends ([F] Fig. 47). Do n ot extend hone more than 3/4 in. to 1 in. (19.1 mm to 25.
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SECTION 11 - CRANKSHAFTS, CAMSHAFTS, BALANCING SYSTEMS, GEAR REDUCTIONS CRANKSHAFT & CA MSHAFT REMOVAL (050000, 085400, 086400, 117400, 138400, 185400, 235400, 245400, 161400, 104700, 260700, 261700) ......................................................................................................... 213 Inspecting Camshaft (All Models) ............................................................................213 Inspecting Crankshaft. .................................................................
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CRANKSHAFT & CAMSHAFT REMOVAL (050000, 085400, 086400, 117400, 138400, 1 85400, 235400, 2 45400, 161400, 1 04700, 260700, 2 61700) 8. Remove the piston. See SECTION 12PISTONS, RINGS AND CONNECTING RODS. 9. Remove crankshaft(Fig. 2). 1. Drain oil from cylinder/sump. 2. Remove blower housi ng, flywheel and any other accessories that obstr uct cover/ sump removal. See SECTION 3- ENGINE DISASSEMBLY. CAUTION: Remove rust, paint a nd any burrs from the PTO end of crankshaft.
If any discrepancies are found: Inspecting Compression Release (050000, 085400, 115400, 117400, 118400, 138400, 185400, 235400, 245400) When inspe cting the compression release mechanism, ensure that all parts move freely. • Replace complete camshaft assembly. Inspecting Valve Tappets (All Models) Inspect valve tappets for wear on the tappet surface. Replace if worn or damaged. Inspecting Crankshaft Refer to Fig. 6 to check wear points on crankshaft. 1.
For reject size dimensi ons, see SECTION 14ENGINE SPECIFICATIONS. BALANCING SYSTEMS Rotating Counterweight System (161400, 185400, 235400, 245400) This system uses a geared counterweight (A) that rotates opposite the crankshaft counterweight (B), Fig. 8. Fig. 9 Installation Refer to Fig. 10. 1. Turn crankshaft to align timing marks (G) on cam gear and crankshaft timing gear. 2. Install counterweight (D) into cylinder. 3.
Oscillating Counterweight System (260700, 261700) 6. Remove connector link ([I] Fig. 13). Removal/Disassembly 1. Remove cylinder cover. See SECTION 10- CYLINDERS, COVERS AND SUMPS. 2. Turn crankshaft to align timing mark on gear (A) with timing mark on camshaft (B). 3. Remove camshaft ([C] Fig. 11). Fig. 13 Fig. 11 4. Remove crankshaft timing gear (D) and counterweight assembly ([E] Fig. 12).
3. Install counterweight assembly into cylinder and slide link (N) on to crankshaft eccentric ([O] Fig. 14). Fig. 14 4. Install timing gear on crankshaft. Refer to Fig. 15. 5. Turn cranksh aft to position timing mark on gear (A) toward camshaft location. 6. Install camshaft (C) and align timing marks (B) and (A). 7. Position cylinder cover gasket (P) on cylinder dowel pins. 8. Slide counterweight pivot shaft (Q) i nto counterweight pivot shaft bore (R) and install cylinder cover.
5. Install screw ([B] Fig. 19). Torque to listed value. Fig. 18 9. Measure counterweight bearings and crankshaft eccentrics and compare to reject dimensions. See SECTION 14ENGINE SPECIFICATIONS. If counterweight bearings are discolored, scored or worn beyond tolerances: • Counterweights must be replaced as a set. If the eccentrics are discolored, scored or worn beyond tolerances: • Replace the crankshaft Assembly/Installation Synchro-Balance® Refer to Fig. 19. 1.
The housing can be installed in four positions (A, B, C, D) relative to the crankshaft ([E] Fig. 21). Fig. 20 Fig. 21 10. Install connecting rod and piston with lubrication hole in rod toward magneto side. This will expose rod assembly marks. 11. Assemble the connecting rod cap, screw locks and screws. 12. Torque screws and bend up locks. 13. Install ta ppets and camshaft. 14. Align timing marks on camshaft and timing gear. Install sump cover.
gear teeth for wear, pitting or scoring. Replace if necessary 5. Inspect crankshaft gear teeth ([F] Fig. 23) for wear, pitting or scoring. Replace if necessary. Fig. 23 6. Remove four screws attaching housing ([G] Fig. 24) to cylinder. Bend ears on locking plates away from heads of two screws inside housing. Fig. 24 11 7. Remove housing and inspect for bearing wear, cracks and warping. Replace if necessary. 216 8. Replace crankshaft oil seal and cork gasket ([H] Fig. 25). Fig.
Install Gear Reduction Housing (115400, 118400) 1. Install new cork gasket on housing, and place housing against cylinder cover in original position, Fig. 27. 5. Insert seal protector (E) in seal of cover. Install cover ([F] Fig. 29) to gear case. Fig. 29 6. Install cover screws and torque to listed value. 7. Check end play of PTO shaft. End play limits: 0.002 - 0.030 in. (0.05 - 0.76 mm). Fig. 27 2. Install mounting screws (A) and locking plates ([B] Fig. 27. Torque to listed value.
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SECTION 12 - PISTONS, RINGS AND CONNECTING RODS REMOVE PISTON AND CONNECTING ROD............................................... 221 Piston Removal ........................................................................................................2 21 Piston Ring Removal................................................................................................221 Piston Pin Removal..................................................................................................
12 220
4. Remove the piston. (Fig. 2). Be careful no t to damage the surface of the cylinder bo re with the connecting rod. REMOVE PISTON AND CONNECTING ROD Piston Removal For related engine information: See SECTION 3ENGINE DISASSEMBLY. 1. Clean carbon deposits or any ridge buildup from top of cylinder bore to prevent ring breakage. 2. Remove connecting rod cap screws ([A] Fig. 1) and connecting rod cap. Check the illustrated parts list (IPL) for your model to determine the proper locking hardw are. Fig.
Piston Pin Removal INSPECT PISTON 1. Remove snap ring ([A] Fig. 4) from both sides of piston( if equipped). Inspect piston for scuffing or galling of the piston skirt. Discoloration of the piston is not cause for rejection Measure Piston Pin Bore Always look for "out-of-round" conditions. 1. Measure piston pin bore with telescoping gauge and compare reading with reject dimension. Fig. 4 2. Slide piston pin ou t of piston. Set pin and connecting rod aside. Piston Pin Removal (28Q700) 1.
Replace piston if rej ect dimensions are exceeded. See SECTION 14- ENGINE SPECIFICATIONS. Measure Piston Ring End Gap 1. Insert the top ring into the cylinder about an inch below the surface of the head ([A] Fig. 8). 2. Measu re gap with feeler gauge ([B] Fig. 8) as shown. Fig. 9 ASSEMBLE PISTON AND CONNECTING ROD Piston Pin Installation Fig. 8 1. Orient the connecting rod and piston as shown in (Fig. 10). 2. Align the letters “MAG” ([A] if used) on the connecting rod with the notch or arrow ([B] Fig.
not have offset piston pin bores and can be assembled to the connecting rod in either direction. marks on the first and second ring. Install them facing up. 6. Oil the piston pin. 7. Insert pin from the side opposite the shoulder stop or the first installed lock. 8. Install the second lock in the piston groove to retain the pin. Ensure both locks are firmly set in the grooves. Ring Installations New piston rings are recommended any time the original rings are removed from the piston.
3. Install the top ring ([D] Fig. 14). 2. Install the center ring (C). 3. Install the top ring ([D] Fig. 16). Fig. 14 Fig. 16 Ring Installation (161400) Note the shape of each ring and be careful to install them in their proper position. 1. Install the oil control rings (A) and expander (B). 2. Install the center ring (C) with the “T” facing up. 3. Install the top ring ([D] Fig. 15) with the “T” facing up.
8. Set piston and compressor assembly ([A] Fig. 21) on cylinder. Be careful not to scratch the surface of the bore with the connecting rod. 9. Push the piston down through the ring compressor and into the cylinder (B) until piston is in cylinder bore ([C] Fig. 21). CAUTION: Do not use exce ssive force when Fig. 18 installing the piston. You could damage the side rails of the oil control ring or impact the crankshaft with the bottom of the connecting rod. 3.
Fig. 23 NOTE: (28Q700) The notch in the connecting rod cap (A) must engage the tab on the connecting rod ([B] Fig. 24). Fig. 24 2. Install the rod bolts, dipper an d washers (if equipped) and torque as listed. See SECTION 14- ENGINE SPECIFICATIONS. CAUTION: (28Q700) Torque screw closest to the piston first. Torque screw farthest from the piston second. 3. Rotate crankshaft two revolutions to ensure crank pin and rod are not binding. 4.
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SECTION 13 - FINAL ENGINE ASSEMBLY GENERAL INFORMATION ............................................................................ 231 MODEL 050000.............................................................................................. 231 Models 085400, 086400, 115400, 117400, 118400, 13840 0, 185400, 235400, 245400 ............................................................................................. 234 MODEL 104700...........................................................................
13 230
GENERAL INFORMATION This engine assembly section assumes you have inspected all the items listed in the "Reject Dimensions" for the engine you are working on. See SECTION 14- ENGINE SPECIFICATIONS. If you have not inspected all the listed items, you may be replacing expensive parts needlessly and/or reinstalling troublesome parts.
4. Install flywheel, woodruff key and position flywheel on crankshaft (Fig. 4). Fig. 6 Fig. 4 5. Position the starter cup (A) on top of the blower fan (B) by aligning the two drive flanges with the casting depressions. Install starter hub (if equipped), washer (C) and flywheel nut ([D] Fig.5). 7. Torque the flywheel nut to value listed in SECTION 14- ENGINE SPECIFICATIONS. 8. Position the Oil Gard® module ([A] Fig. 7) as shown. Fig. 7 Fig. 5 6. Place Flywheel Strap Wrench #19433 ([A] Fig.
9. Install the cylinder shield (Fig. 8). 11. Install grounding lead ([A] Fig. 10) as shown. Fig. 8 10. Set the blower housing in position and check that no wires are pinched. Position spark plug lead in the contour created for it ([A] Fig. 9). Fig. 10 12. Assemble shield ([A] Fig. 11) as shown. Fig. 11 Fig. 9 13. Mount the remaining blower housing bolts and torque to value listed. See SECTION 14- ENGINE SPECIFICATIONS.
14. Refer to Fig. 12 and install components as shown. MODELS 085400, 086400, 115400, 117400, 1 18400, 138400, 1 85400, 235400, 245400 NOTE : The 185400 was used as a general representation of the following models; 085400, 086400, 115400, 117400, 118400, 138400, 235400, 245400. Those engines that have gear reduction systems are covered in section 11. With minor variations, the 185400 is a good outline for the procedures required to assemble the above mentioned engines. 1.
5. Install the upper (A) and lower ([B] Fig. 16) cylinder shields. 11. Connect fuel hose ([C] Fig. 18) to carburetor. Fig. 16 6. Install the blower housing. Make sure the engine turns over with the starter rope. 7. Install the governor lever and connect the return spring (A), carburetor throttle link (B) and the choke link (C) to the control bracket ([D] Fig. 17). Fig. 18 12. Install air cleaner base ([A] Fig. 19). Fig. 19 13. Install air filter and cover. Fig. 17 8. Install muffler. 9.
14. Mount the Oil Gard® module ([A] Fig. 21) as shown and connect wires to the stop switch. Fig. 21 15. Install the breather tube (A) and route the spark plug wire ([B] Fig. 22) as shown. 3. Place large carburetor gasket-adapter ([A] Fig. 24). Fig. 24 4. With the governor lever in position, loosely install both control brackets ([A & B] Fig.25). Fig. 22 16. Mount trim cover over the throttle and choke controls. MODEL 104700 Fig. 25 5. Connect governor return spring ([A] Fig.26). 1.
8. Route the alternator wire (D) and the ignition coil wire (E) as shown in Fig. 27. carburetor assembly ([C] Fig. 28) on mounting studs. Fig. 28 Fig. 27 9. With the wires routes as shown, torque the back plate and control bracket mounting bolts to listed values. See SECTION 14ENGINE SPECIFICATIONS. 10. Mount the flywheel, woodruff key, fan and rewind starter hub. Torque flywheel nut to listed value. See SECTION 3ENGINE DISASSEMBLY. 11. Install the exhaust manifold and its heat shield.
MODEL 161400 4. Position the fan to allow for the magnet to fit in the fan cut-out ([A] Fig. 31). 1. Install the cylinder baffle using the upper head bolts (A) and one lower mounting screw ([B] Fig. 29). Make sure to torque head bolts to listed values. See SECTION 14- ENGINE SPECIFICATIONS. Fig. 31 5. Install the ignition coil and adjust the air gap. 6. Route the ignition harness as shown (A) and connect wire to ignition coil. Torque control bracket screws ([B] Fig. 32) to values listed in section 14.
8. Connect the other end of the governor link and spring to throttle lever ([D] Fig. 33) and temporarily install carburetor. 11. Torque carburetor mounting bolts ([D] Fig. 35) to values listed. See SECTION 14- ENGINE SPECIFICATIONS. Fig. 33 9. Route the spark plug wire (A) and the governor links as shown and install the blower housing. Make sure there are no obstructions to the governor links at (B) and ([C] Fig. 34). Fig. 35 12.
17. Connect breather hose and install air filter housing (A) and trim ([B] Fig. 37). 2. Install the control bracket (Fig. 39). Fig. 39 Fig. 37 18. Install air filter and cover. 3. Connect the main governor spring ([A] Fig. 40). MODELS 260700, 261700 1. Mount the governor lever (A) o n th e governor shaft as shown in Fig. 38. Fig. 40 4. Connect the idle control spring ([A] Fig.41). Fig. 38 Fig. 41 5. Install the alternator.
6. Install the ignition coil harness to the ground term inal (A) and route the harness ([B] Fig. 42) as shown. 11. Install the fan retainer, flywheel nut and starter cup. Torque to listed values. Fig. 44 Fig. 42 7. Loosely position the back plate and route the alternator wires as shown in ([A] Fig.43). 12. Install the ignition coil and set the air gap. 13. Install the exhaust system. See SECTION 4- EXHAUST SYSTEMS. Route the spark plug wire as shown in ([A] Fig. 45). Fig. 43 Fig. 45 8.
14. Install the governor links as sho wn in Fig. 46. 21. Install blower housing. Fig. 48 Fig. 46 15. Install the air cleaner manifold and attach breather hose. Torque nuts to listed values. See SECTION 14- ENGINE SPECIFICATIONS. 16. Install fuel pump bracket (A) and fuel pump (B). 17. Connect fuel l ines ([C] Fig. 47) to carburetor and cylinder. MODEL 28Q700 1. Install flywheel guard ([A] Fig. 49). 2. Install alternator with the power output wires positioned as shown ([B] Fig. 49). 3.
4. Install flywheel with fan, fan retainer and flywheel nut. Torque nut ([A] Fig. 50) as shown to values listed in section 14. Fig. 50 5. Install ignition coil and set air gap. 6. With coil installed and ground wire connected, route wire through small clamp ([A] Fig. 51) to grounding terminal on equipment. 7. Install governor link with spring (A) and connect choke arm ([B] Fig. 52) as shown. Fig. 52 8. Install air cleaner base to carburetor and torque mounting nuts ([A] Fig. 53) to listed values.
9. Install inner blower housing with brackets ([A] Fig. 54) as shown. Fig. 54 10. Install the oil-fill tube. 11. Install the outer blower housing on brackets (Refer to Fig. 54). 12. Install grill to top of flywheel fan. 13. Install bracket for the fuel pump (A). Install pump (B) and connect fuel lines ([C] Fig. 55). Fig.
SECTION 14 - ENGINE SPECIFICATIONS & REFERENCE TABLES MODEL 050000 ........................................................................................... 247 Engine S pecifications .................................................................................. 247 Fastener Torque S pecifications................................................................... 247 Reject Dimensions....................................................................................... 248 MODELS 085400 & 086400 ...
MODELS 235400 & 245400 ........................................................................ 265 Engine Specifications .................................................................................. 265 Fastener Torque S pecifications................................................................... 265 Reject Dimensions....................................................................................... 266 MODEL 161400...............................................................................
MODEL 050000 Engine Specifications (050000) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 3.625 in. (92.08 mm) 2.047 in. (52.0 mm) .002 -.006 in. (.05 -.15 4.88 cu. in. (80 cc) 1.7 qt. (1.6 liter) 13 oz. (.4 liter) .024 -.028 in. (.60 -.70 1.496 in. (38.0 mm) .004 -.008 in. (.10 -.20 .004 -.008 in. (.10 -.
Fastener Torque Specifications (050000) Tool Size Torque Oil Guard Float Switch Rewind Retainer Screw Rewind Starter Rocker Arm Assembly Rocker Ball Set Screw or Nut Spark Plug Valve Cover 10 mm Phillips 10 mm 10 mm 10 mm 5/8 in. 10 mm 45 lb-in. (5 Nm) 70 lb-in. (8 Nm) 45 lb-in. (5 Nm) 45 lb-in. (5 Nm) 45 lb-in. (5 Nm) 180 lb-in. (20 Nm) 35 lb-in. (4 Nm) Reject Dimensions (050000) Standard Size Reject Size Cylinder (050000) Magneto Bearing Camshaft Bearing Bore Diameter Bore Out-Of-Round Ball .
Reject Dimensions (050000) Standard Size Reject Size Connecting Rod (050000) Crank Pin Bearing Piston Pin Bearing .9059 in. (23.01 mm) .5516 in. (14.01 mm) .9071 in. (23.04 mm) .5528 in. (14.04 mm) Piston (050000) Piston Pin Diameter Piston Pine Bore Ring End Gap (Top) Ring End Gap (Middle) Ring End Gap (Oil Control) Ring Land Clearance (Top) Ring Land Clearance (Middle) Ring Land Clearance (Oil Control) .5512 in. (14.00 mm) .5516 in. (14.01 mm) .006-.014 in. (.15-.35 .006-.014 in. (.15-.35 .008-.
MODELS 085400 AND 086400 Engine Specifications (085400 & 086400) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 mm) 3.625 in. (92.08 mm) 2.441 in. (62.0 mm) .001 -.008 in. (.03 -.20 mm) 7.69 cu. in. (126 cc) 3.2 qt. (3.0 liter) 20 oz. (.6 liter) .030 in. (.76 mm) 1.653 in. (42.0 mm) .002 -.004 in. (.05 -.10 mm) .002 -.004 in. (.05 -.
Reject Dimensions (085400 & 086400) Standard Size Reject Size Cylinder (085400 & 086400) Magneto Bearing Camshaft Bearing Bore Diameter Bore Out-Of-Round Ball .5909 in. (15.01 m m) 2.441 in. (62.00 m m) N/A N/A .5917 in. (15.03 m m) 2.442 in. (62.03 m m) .0015 in. (.04 m m) Cylinder Head (085400 & 086400) Standard Size Reject Size Intake Valv e Seat Angle 45° N/A Intake Valv e Seat Width Intake Valve Stem Diameter Intake Valv e Guide 3/64-4/64 in. (1.19-1.59 mm) .2346 in. (5.96 m m) .2368 in.
Reject Dimensions (085400 & 086400) Standard Size Reject Size Piston (085400 & 086400) Piston Pin Diameter Piston Pine Bore Ring End Gap (Top) Ring End Gap (Middle) Ring End Gap (Oil Control) Ring Land Clearance (Top) Ring Land Clearance (Middle) Ring Land Clearance (Oil Control) .5512 in. (14.00 m m) .5516 in. (14.01 m m) .006-.014 in. (.15-.35 mm) .006-.014 in. (.15-.35 mm) .008-.028 in. (.35-.70 mm) .001-.003 in. (.03-.07 mm) .001-.003 in. (.03-.07 mm) .001-.003 in. (.03-.07 mm) .5504 in. (13.
MODELS 115400 AND 117400 Engine Specifications (115400 & 11740 0) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 3.625 in. (92.08 mm) 2.677 in. (68.0 mm) .001 -.008 in. (.03 -.20 11.05 cu. in. (181 cc) 4.2 qt. (4.0 liter) 24 oz. (.7 liter) .030 in. (.76 mm) 1.968 in. (50.0 mm) .002 -.004 in. (.05 -.10 .002 -.004 in. (.05 -.
Fastener Torque Specifications (115400 & 117400) Tool Size Torque Rewind Retainer Screw Rewind Starter Rocker Arm Piv ot Rocker Arm St ud Rocker Ball Set Screw or Nut Spark Plug Starter Contactor Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator Phillips 10 mm 14 mm 12 mm 10 mm 5/8 in. 8 mm 12 mm 10 mm 10 mm 10 mm 10 mm 70 lb-in. (8 Nm) 45 lb-in. (5 Nm) N/A 175 lb-in. (20 Nm) 35 lb-in. (4 Nm) 180 lb-in. (20 Nm) 35 lb-in. (4 Nm) 140 lb-in. (16 Nm) 50 lb-in.
Reject Dimensions (115400 & 117400) Standard Size Reject Size Camshaft (115400 & 117400) Mag-Side J ournal PTO-Side J ournal Intake lobes Exhaust lobes .5905 in. (15.00 m m) .5905 in. (15.00 m m) 1.1102 in. (28.20 m m) 1.1102 in. (28.20 m m) .5898 in. (14.98 m m) .5898 in. (14.98 m m) 1.0827 in. (27.50 m m) 1.0827 in. (27.50 m m) Connecting Rod (115400 & 117400) Crank Pin Bearing Piston Pin Bearing 1.1817 in. (30.02 m m) .6303 in. (16.01 m m) 1.1827 in. (30.04 m m) .6311 in. (16.
MODEL 118400 Engine Specifications (118400) Armature Air Gap Bolt Circle (1) Bolt Circle (2) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 3.625 in. (92.08 mm) 4.5 in. (114.3 mm) 2.677 in. (68.0 mm) .002 -.006 in. (.05 -.15 11.05 cu. in. (181 cc) 3.8 qt. (3.6 liter) 24 oz. (.7 liter) .024 -.028 in. (.61 -.71 1.968 in. (50.0 mm) .004 -.008 in. (.10 -.20 .004 -.008 in. (.10 -.
Reject Dimensions (118400) Standard Size Reject Size Cylinder (118400) Magneto Bearing Camshaft Bearing Bore Diameter Bore Out-Of-Round Ball .5909 in. (15.01 m m) 2.677 in. (68.00 m m) N/A N/A .5917 in. (15.03 m m) 2.678 in. (68.07 m m) .0015 in. (.04 m m) Cylinder Head (118400) Standard Size Reject Size Intake Valv e Seat Angle 45° N/A Intake Valv e Seat Width Intake Valve Stem Diameter Intake Valv e Guide 3/64-4/64 in. (1.19-1.59 mm) .215 in. (5.46 m m) .2165 in. (5.50 m m) N/A .213 in. (5.
Reject Dimensions (118400) Standard Size Reject Size Connecting Rod (118400) Crank Pin Bearing Piston Pin Bearing 1.1815 in. (30.01 mm) .6303 in. (16.01 mm) 1.1827 in. (30.04 mm) .6315 in. (16.04 mm) Piston (118400) Piston Pin Diameter Piston Pine Bore Ring End Gap (Top) Ring End Gap (Middle) Ring End Gap (Oil Control) Ring Land Clearance (Top) Ring Land Clearance (Middle) Ring Land Clearance (Oil Control) .6299 in. (16.00 mm) .6303 in. (16.01 mm) .006-.014 in. (.15-.35 .006-.014 in. (.15-.35 .008-.
MODEL 138400 Engine Specifications (138400) Armature Air Gap Bolt Circle (1) Bolt Circle (2) Bolt Circle (3) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 3.937 in. (100 mm) 5.0 in. (127 mm) 6.5 in. (165.1 mm) 2.835 in. (72.0 mm) .002 -.025 in. (.05 -.64 13.12 cu. in. (215 cc) 4.8 qt. (4.5 liter) 32 oz. (.9 liter) .030 in. (.76 mm) 2.087 in. (53.0 mm) .005 -.008 in. (.13 -.
Fastener Torque Specifications (138400) Tool Size Torque Rocker Arm Pivot Rocker Arm Stud Rocker Ball Set Screw or Nut Spark Plug Starter Contactor Starter Key Switch Panel Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator / Rectifier 14 mm 12 mm 10 mm 5/8 in. 10 mm 10 mm 12 mm 7 mm 10 mm 10 mm 10 mm N/A 175 lb-in. (20 Nm) 35 lb-in. (4 Nm) 180 lb-in. (20 Nm) 45 lb-in. (5 Nm) 45 lb-in. (5 Nm) 140 lb-in. (16 Nm) 50 lb-in. (6 Nm) 45 lb-in. (5 Nm) 35 lb-in.
Reject Dimensions (138400) Standard Size Reject Size Camshaft (138400) Mag-Side Journal PTO-Side Journal Intake lobes Exhaust lobes .5905 in. (15.00 mm) .5905 in. (15.00 mm) 1.1476 in. (29.15 mm) 1.1476 in. (29.15 mm) .5898 in. (14.98 mm) .5898 in. (14.98 mm) 1.1083 in. (28.15 mm) 1.1083 in. (28.15 mm) Connecting Rod (138400) Crank Pin Bearing Piston Pin Bearing 1.1817 in. (30.02 mm) .6303 in. (16.01 mm) 1.1827 in. (30.04 mm) .6311 in. (16.
MODEL 185400 Engine Specifications (185400) Armature Air Gap Bolt Circle (1) Bolt Circle (2) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 in. (.30 -.50 3.937 in. (100 mm) 6.5 in. (165.1 mm) 3.150 in. (80.0 mm) .001 -.008 in. (.02 -.20 18.06 cu. in. (296 cc) 6.3 qt. (.6 liter) 32 oz. (.9 liter) .030 in. (.76 mm) 2.323 in. (59.0 mm) .002 -.004 in. (.05 -.10 .002 -.004 in. (.05 -.
Fastener Torque Specifications (185400) Tool Size Torque Rewind Retainer Screw Rewind Starter Rocker Arm Pivot Rocker Arm Shaft Rocker Ball Set Screw or Nut Spark Plug Starter Contactor Starter Key Switch Panel Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator / Rectifier Phillips 10 mm 14 mm 12 mm 10 mm 5/8 in. 10 mm 10 mm 12 mm 7 mm 10 mm 10 mm 10 mm 70 lb-in. (8 Nm) 55 lb-in. (6 Nm) N/A 175 lb-in. (20 Nm) 35 lb-in. (4 Nm) 180 lb-in. (20 Nm) 45 lb-in.
Reject Dimensions (185400) Standard Size Reject Size Camshaft (185400) Mag-Side Journal PTO-Side Journal Intake lobes Exhaust lobes .5905 in. (15.00 mm) .5905 in. (15.00 mm) 1.2657 in. (32.15 mm) 1.2657 in. (32.15 mm) .5898 in. (14.98 mm) .5898 in. (14.98 mm) 1.2402 in. (31.50 mm) 1.2402 in. (31.50 mm) Connecting Rod (185400) Crank Pin Bearing Piston Pin Bearing 1.3392 in. (34.02 mm) .7091 in. (18.01 mm) 1.3402 in. (34.04 mm) .7098 in. (18.
MODELS 235400 AND 245400 Engine Specifications (235400 & 245400) Armature Air Gap Bolt Circle (1) Bolt Circle (2) Bolt Circle (3) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .012 -.020 (.30 -.50 mm) 5.0 in. (127 mm) 6.5 in. (165.1 mm) 7.75 in. (197 mm) 3.504 in. (89.0 mm) .001 -.008 in. (.02 -.20 mm) 23.86 cu. in. (391 cc) 7.4 qt. (.7 liter) 32 oz. (.9 liter) .030 in. (.76 mm) 2.48 in. (63.0 mm) .
Fastener Torque Specifications (235400 & 245400) Tool Size Torque Rocker Arm Shaft Rocker Ball Set Screw or Nut Spark Plug Starter Contactor Starter Key Switch Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator / Rectifier 10 mm 12 mm 5/8 in. 8 mm 10 mm 12 mm 10 mm 10 mm 10mm 10 mm 85 lb-in. (10 Nm) 35 lb-in. (4 Nm) 180 lb-in. (20 Nm) 35 lb-in. (4 Nm) 45 lb-in. (5 Nm) 140 lb-in. (16 Nm) 50 lb-in. (6 Nm) 45 lb-in. (5 Nm) 35 lb-in. (4 Nm) 45 lb-in.
Reject Dimensions (235400 & 245400) Stand ard Size Reject Size Camshaft (235400 & 245400) Mag-Side Journal PTO-Side Journal Intake lobes Exhaust lobes .5905 in. (15.00 mm) .5905 in. (15.00 mm) 1.2894 in. (32.75 mm) 1.2894 in. (32.75 mm) .5898 in. (14.98 .5898 in. (14.98 1.2598 in. (32.0 1.2598 in. (32.0 Counterweight Shaft (235400 & 24500) Mag Side Journal PTO Side Journal .6772 in. (17.2 mm) .6772 in. (17.2 mm) .6756 in. (17.16 mm) .6756 in. (17.
MODEL 161400 Engine Specifications (161400) Armature Air Gap Bolt Circle (1) Bolt Circle (2) Bore Crankshaft End Play Displacement Fuel Tank Capacity Gear Reduction End Play Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .008 -.012 in. (. 20 -.30 mm) 5.0 in. (127 mm) 6.5 in. (165.1 mm) 3.0 in. (76.2 mm) .002 -.025 in. (. 05 -.64 mm) 16.48 cu. in. (270 cc) 5.0 qt. (4.7 liter) .002-.030 in. (.05-.76) 40 oz. (1.2 liter) .030 in. (.76 mm) 2.33 in. (59.18 mm) .
Fastener Torque Specifications (161400) Tool Size Torque Intake Manifold Muffler Muffler Brac ket Muffler Guard Oil Drain Plug Oil Fill Cap Oil Fill Tube Oil Guard Float Switch Rewind Retainer Screw Rewind Starter Rocker Arm Stud Rocker Arm Pivot Rocker Ball Set Screw or Nut Spark Plug Starter Drive Cover Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator / Rectifier 8 mm 8 mm 8 mm 1/4 in. & 8 mm 3/8 in.
Reject Dimensions (161400) Standard Size Reject Size Cylinder Cover (161400) PTO Bearing Camshaft Bearing Counterweight Bearing Ball .6255 in. (15.89 m m) .6255 in. (15.98 m m) N/A .6275 in. (15.94 m m) .6275 in. (15.94 m m) Crankshaft (161400) Crank Pin Journal Mag-Side J ournal PTO-Side J ournal 1.43 in. (36.32 m m) 1.5 in. (38.10 m m) Ball 1.429 in. (36.3 m m) 1.4973 in. (38.03 m m) N/A Camshaft (161400) Mag-Side J ournal PTO-Side J ournal Intake Lobes Exhaust Lobes Compression Release Lobe .
MODEL 104700 Engine Specifications (104700) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - With Filter Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .008-.012 in. (.20-.30 mm) 8.0 in. (203.2 mm) 2.561 in. (65.06 mm) .002-.020 in. (.05-.51 mm) 10 cu. in. (164 cc) 1.5 qt. (1.4 liter) 28 oz. (.8 liter) 24.7 oz. (.7 liter) .030 in. (.76 mm) 1.94 in. (49.28 mm) .003-.005 in. (.08-.13 mm) .003-.005 in.
Fastener Torque Specifications (104700) Tool Size Torque Oil Pump Cover Oil Pump Screen Rewind Retainer Screw Rewind Starter Rocker Arm Stud Rocker Arm Pivot Rocker Ball Set Screw or Nut Spark Plug Starter Drive Cover Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover 8 mm 7 mm Phillips 8 mm 10 mm 10 mm T-15 5/8 in. 7/32 in. 10 mm 8 mm 1/4 in. 8 mm 55 ln-in. (6 Nm) 35 lb-in. (4 Nm) 70 lb-in. (8 Nm) 55 lb-in. (6 Nm) 85 lb-in. (10 Nm) N/A 50 lb-in. (6 Nm) 180 lb-in. (20 Nm) 35 lb-in.
Reject Dimensions (104700) Standard Size Reject Size Camshaft (104700) Mag-Side J ournal PTO-Side J ournal Intake lobes Exhaust lobes Compression Release Lobe .5 in. (12.7 m m) .6890 in. (17.5 m m) N/A N/A .020-.025 in. (.51-.64 mm) .498 in. (12.65 m m) .6871 in. (17.45 m m) 1.136 in. (28.85 m m) 1.136 in. (28.85 m m) .022-.028 in. (.56-.71 mm) Connecting R od (104700) Crank Pin Bearing Piston Pin Bearing 1.231 in. (31.26 m m) .5519 in. (14.02 m m) 1.233 in. (31.32 m m) .5522 in. (14.
MODELS 260700 & 261700 Engine Specifications (260700 & 26170 0) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - With Filter Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .008 -.012 in. (.20 -.30 10.0 in. (254 mm) 3.437 in. (87.29 mm) .002 -.020 in. (.05 -.51 26.55 cu. in. (435 cc) N/A 72 oz. (2.1liter) 64 oz. (1.9 liter) .030 in. (.76 mm) 2.860 in. (72.64 mm) .003 -.005 in. (.08 -.13 .003 -.005 in.
Fastener Torque Specifications (260700 & 261700) Tool Size Torque Oil Drain Plug Oil Fill Tube Oil Filter Adapter Oil Pressure Switch Oil Pump Cover Rewind Retainer Screw Rewind Adaptor Rewind Starter Rope Starter Cup Rotating Screen Rocker Arm Stud Rocker Arm Pivot Rocker Ball Set Screw or Nut Spark Plug Starter Motor Bracket Starter Motor Thorough Bolt s Stator Valve Cover Voltage Regulator / Rectifier 7/16 in. Square 8 mm 10 mm 1 1/16 in.
Reject Dimens ions (260700 & 2617 00) Standard Size Reject Size Sump Cover (260700 & 261700) PTO Bearing Camshaft Bearing Counterweight Pivot Shaft 1.625 in. (41.28 mm) .6255 in. (15.89 mm) .5 in. (12.7 mm) 1.628 in. (41.35 mm) .6280 in. (15.95 mm) .498 in. (12.65 mm) Crankshaft (260700 & 261700) Crank Pin Journal Mag-Side Journal PTO-Side Journal Eccentrics 1.624 in. (41.26 mm) 1.624 in. (41.26 mm) 1.624 in. (41.26 mm) 2.6811 in. (68.10 mm) 1.622 1.622 1.622 2.
MODEL 28Q700 Engine Specifications (28Q700) Armature Air Gap Bolt Circle (1) Bore Crankshaft End Play Displacement Fuel Tank Capacity Oil Capacity - With Filter Oil Capacity - No Filter Spark Plug Gap Stroke Valve Clearance - Intake Valve Clearance - Exhaust .010 -. 014 in. (. 25 -.36 m m) 10.0 in. (254 mm) 3.437 in. (87.29 m m) .002 -. 023 in. (. 05 -.58 m m) 28.37 cu. in. (465 cc) N/A 52 oz. (1.5 liter) 48 oz. (1.4 liter) .030 in. (.76 m m) 3.062 in. (77.78 m m) .003 -. 005 in. (. 08 -.13 m m) .005 -.
Fastener Torque Specifications (28Q700) Tool Size Torque Oil Drain Plug Oil Fill T ube Oil Filter Adapter Oil Pressure Switch Oil Pump Cover Oil Pump Screen Rocker Arm Pivot Rocker Arm Stud Rocker Ball Set Screw or Nut Rotating Screen Spark Plug Starter Drive Cover Starter Motor Bracket Starter Motor Thorough Bolts Stator Valve Cover Voltage Regulator / Rectifier 7/16 in. Square 1/4 in. 1/2 in. or T-40 1 1/16 in. 5/16 in. 1/4 in. 10 mm 10 mm T-15 5/16 in. 5/8 in. 1/4 in. 1/2 in. 5/16 in.
Reject Dimensions (28Q700) Standard Size Reject Size Crankshaft (28Q700) Crank Pin Journal (Before 98070xx) Crank Pin Journal (After 98070xx) Mag-Side Journal PTO-Side Journal 1.2489 1.4986 1.3780 1.3780 1.2478 1.4975 1.3761 1.3761 Camshaft (28Q700) Mag-Side Journal PTO-Side Journal Intake lobes Exhaust lobes .5000 in. (12.70 mm) .5000 in. (12.70 mm) N/A N/A .4981 in. (12.65 mm) .4981 in. (12.65 mm) 1.2213 in. (21.02 mm) 1.2213 in. (21.
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