CONTENTS Section Title Page 1. SPECIFICATIONS ....................................................................................................... 1 2. PERFORMANCE ........................................................................................................ 3 . 2-1 MAXIMUM OUTPUT ........................................................................................................ 2-2 CONTINUOUS RATED OUTPUT ..................................................................................
Section Title Page 7. AUTOMATIC DECOMPRESSION SYSTEM............................................................ 46 8 CARBURETOR ........................................................................................................ 47 8-1 OPERATION AND CONSTRUCTION............................................................................ 47 8-2 DISASSEMBLY AND REASSEMBLY............................................................................. 48 9. STARTING SYSTEM ...................................
I MODEL 1 EH36 ~~~ EH36B ~ ~ EH36BS EH36DS I Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, OHV Gasoline Engine Type 89 x 65 mm (3.50x 2.56 in.) Bore x Stroke Piston Displacement 404 cm3 (24.65 cu.in.) Compression Ratio 8.3 output EH36D I I HP) /I800r.p.m. Continuous 6.3 kW (8.5 HP) /3600r.p.m. 6.3 kW (8.5 8.5 kW (11.5 HP) /1800 r.p.m. Max. - ~ 8.5 kW (1 1.5HP) /3600 r.p.m. - - 27.4 N m (2.80 kgf m) /2500r.p.m. 54.9 N m (5.60kgf m) /1250 r.p.m. Max.
I EH41 MODEL EH41BS EH41B EH41D EH41DS Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, OHV Gasoline Engine I Bore x Stroke 89 x 65 mm (3.50 x 2.56 in.) 1 404 cm3 (24.65 cu.in.) btonbisplacement I ~~ 8.3 Empression Ratio Output Continuous 7.0 kW (9.5 HP) /1800 r.p.m. 7.0 kW (9.5 HP) 13600 r.p.m. Max. 9.9 kW (13.5 HP) /1800 r.p.m. 9.9 kW (13.5 HP) /3600 r.p.m. - Max.
2. PERFORMANCE 2-1 MAXIMUM OUTPUT The maximum output is the outputan ofengine with its throttle valve fully opened under the condition that all the moving parts are properly brokenin after the initial break-in period. A new engine may not produce full maximum output while its moving parts are still not broken-in. NOTE : Power curves shownin the following charts are made in conformity withSAE internal combustion engine standard test codeJ 1349.
2-4 PERFORMANCE CURVES EH36 ( ) for type B t kgf-m (5.6) 2.8 Nom :54) 27 (5.4) 2.7 :52) 26 (5.2) 2.6 :50) 25 ! ! j(5.0) 2.5 :48) 24 (4.8) 2.4 :46) 23 (4.6) 2.3 (44) 22 (4.4) 2.2 HP 12 11 kW 9.0 8.0 10 7.0 9 8 7 6.0 5.0 6 4.0 5 4 3 3.0 2.0 28 24 (12) (14) REVOLUTION - 4- 32 (1 6) 36 (18) r.p.m.
EH41 - kgfom (5.8) 2.9 1 w (5.6) 2.8 I- ( for tvpe B Nom (56) 28 (54) 27 (52) 26 (5.2) 2.6 HP kW 14 10.0 13 12 11 9.0 8.0 10 7.0 9 8 7 6.0 5.0 6 4.0 5 4 3 3.0 2.0 20 24 28 (10) (12) (14) REVOLUTION - 5- 3632 (16) x10 (18) r.p.m.
1. The overhead valve design offers a compactness, light weight and ideal combustion characteristics resulting in more power from less fuel and prolonged engine life. 2. The adoption of an inclined cylinder offers low height of engine, makingthe arrangements for installing the engine much easier for various powered equipments. 3. The vibration, free design with a balancer system and lighter reciprocating parts. 4.
4. GENERAL DESCRIPTION OF ENGINE COMPONENTS 4-1 CYLINDER AND CRANKCASE The cylinder and crankcase is a single piece aluminum die-casting. The cylinder liner, made of special cast iron, is molded into the aluminum casting. The crankcase has a mounting surface on the output shaft side, where the main bearing cover is attached. I Fig. 4- 1 4-2 MAIN BEARING COVER The main bearing coveris an aluminum die-casting, which is mounted on the output shaft sideof the crankcase.
4-4 CONNECTING ROD ANDPISTON The connectingrod is an aluminum alloy die-casting andits large and small ends function as bearings. I The piston is an aluminum alloy casting, andcarries two compression rings and oneoil ring. 4-5 PISTON RINGS I The piston rings are made of special cast iron. Fig. 4-4 The profileof the top ring is a barrel face and the second ring has a tapered face. The oil ringis designed for better sealing and less oil consumption, in combination with 3 pieces.
B Theintakevalveislocated cylinder head. on flywheelside of the Hard alloy valve seats are molded in the cylinder head and stellite is fused to the exhaust valve face. The cylinder baffle leads cooling air to the exhaust valve areafor the optimum cooling. EXHAUST VALVE INTAKE VALVE Fig. 4-7 4-8 CYLINDER HEAD The cylinder head is an aluminum die-casting which utilizes semi-spherical type combustion chamber for the high combustion efficiency. Fig.
4-10 COOLING SYSTEM The large fins on the flywheel provide sufficient cooling air capacity for the inlet and exhaust area and cylinder. The cylinder baffle helps the cooling air flow efficiently. 4-11 LUBRICATION SYSTEM All the rotating and sliding parts are splash- lubricated by theoil splasher on the connecting rod. I OIL SPLASHER Fig.
4-13 CARBURETOR The engineis equipped with a horizontal draft carburetor that has a float controlled fuel system and a fixed main jet. The carburetors are calibrated carefully for sure starting, good acceleration, less fuel consumption and sufficient output. For details, referto page 47, section "8 CARBURETOR''. Fig. 4-72 4-14 AIR CLEANER KNOB Air-cleaner is a heavy-duty type with a dual element system; the primary one is an urethane foam (semi-wet) and secondary one is a dry type paper element.
4-16 DECOMPRESSION SYSTEM AUTOMATIC DECOMPRESSION SYSTEM An automatic decompression mechanismwhich opens exhaust valve before the piston reaches compression top is assembled on the camshaft for easy starting. RETURN SPRING Fig.
4-17 SECTIONAL VIEW OF ENGINE MUFF P.T.O. MAIN BEARING COVER FLYWHEEL Fig.
FUEL TANK I BALANCER SHAFT CRANKCASE CRANKSHAFT \ Fig.
5. DISASSEMBLY AND REASSEMBLY 5-1 PREPARATIONS AND SUGGESTIONS 1) When disassembling the engine, memorizethe locations of individual parts so that they can be reassembled correctly.If you are uncertainof identifying someparts, it is suggested that tags be attached to them. 2) Have boxes readyto keep disassembledparts by group. 3) To prevent losingand mispfacing, temporarily assemble each groupof disassembled parts. 4) Carefully handle disassembled parts, and clean them with washing oil if necessary.
5-3 DISASSEMBLY PROCEDURES fi Parts to remove Step Engine oildrain 1 Remarks and procedures Fasteners (1) Remove oil drain plug and drain oil. (2) To discharge oil quickly, remove oil gauge. OIL LEVEL GAUGE GASKET I OIL DRAIN PLUG Fig.
Step Parts to remove 2 Air cleaner cover and elements 3 Air cleaner base and gasket Remarks and procedures Fasteners cap nut Remove breather pipe from cylinder head. M6 flange nut : 2 pcs. M6 x 28 : 1 pce. v CAP NUT fig.
Parts to remove Step Fasteners Remarks and procedures M8 x 20 ; 4 pcs. (1) Close fuel cock. (2) Loosen the nut of fuel strainer and remove it. (3) Disconnect fuel pipe from fuel strainer. * Wipe off spilt fuel thoroughly. Fuel tank 4 . r Disconnect wire complete. Remove switch. stop Stop switch I screw ; 2 pcs. M8 BOLT AND WASHER ASSY : RUBBER PIPE Fig.
Parts to remove Remarks and procedures Control box, Diode rectifier, Magnetic switch and Electric starter (Option) 1 (1) Disconnect wires and remove control box. (2) Remove black wires from electric starter. (3) Loosen two bolts and remove electric starter. M6 FLANGE BOLT : 1 me. M6 SCREW (PANHEAD) : 1 pce. WIRE 2 M6 NU1 Fig. 5-5 - 19- Fasteners M8 ; 2 pcs.
Parts to remove Step 7 8 Remarks and procedures Muffler and muffler bracket Be careful notto lose muffler gasket. Carburetor Remove carburetor carefully unhooking governorrod and rod spring from governor lever. Fasteners M8 nut ; 2 pes. M8 x 16 ; 2 pcs. M6 TAPPING SCREW :5 DCS. M8 FLANGE FFLER UNIT Fig.
I Parts to remove Remarks and procedures (1) Unhook governor springfrom governor lever. Mark the holeon which the governor spring is hooked. (2) Loosen the bolt and remove governor lever. GOVERNOR LEVER GOVERNOR ROD GOVERNOR SPRING ROD SPRING M6 BOLT AND WASHER AY :1 pce. Fasteners ~~~~~ j Fig.
Step Parts to remove Fasteners Remarks and procedures 10 Recoil starter (Pulley cover ; type DS and type BS) M6 x 8 ; 4 pcs. 11 Blower housing M6 x 12 ; 5 pcs.. M6 FLANGE BOLT : 4 pcs. \ M6 FLANGE BOLT BLOWER HOUSING CP / PULLEY COVER CP (type W B S ) Fig.
Step. Parts remove to I I Remarks and procedures I (1) Remove spark plug cap from Ignition coil Fasteners I M6 x 25 ; 2 pcs. spark plug. (2) Remove ignition coilfrom crankcase. 12 Flywheel M8 x 12 ; 3 pcs. M18 nut, washer, spring washer (1) Remove the starting pulley. (2) Remove nut from crankshaft. (See Fig. 5-9.) (3) Remove flywheel using the flywheel puller. (See Fig. 5-10.) (4) Remove the key from crankshaft. (See Fig. 5-11.) 13 M8 BOLT :3 pes.
Parts to remove Step 14 1 15 16 1 I Remarks and procedures Fasteners A Charge coil (Option) M6 x 20 ; 2 pcs. Remove the Cylinder baffle M6 x 8 ; 4 pcs. 1 Spark plug NGK ; BPGES "a&) " M6 FLANGE BOLT : 2 pcs. CYLINDER BAFFLE 1 with SPEED CONTROL M6 SCREW (PANHEAD) :1 pce. M6 FLANGE BOLT : 2 pcs. Fig.
r 171 Parts to remove I I Remarks and procedures M6 x 25 ; 4 pcs. Rocker cover Remove rocker cover and gasket from cylinder head. 18 Rocker arm and push rod (1) Loosen nut and pivot on rocker arm. (2) Remove push rods from cylinder. 19 Cylinder head Remove cylinder head and gasket from crankcase. - M I 0 x 65 ; 4 pcs. ROCKER COVER CP CYLINDER HEAD FLANGE BOLT : 2 pcs. A \ Fasteners ’* \ / / \ \ / \ / - L/ - Fig.
Step Parts to remove intake and exhaust valves 20 Fasteners Remarks and procedures (1) Press down spring retainer,take out collet valve, and then remove spring retainer and valve spring. (2) Remove intake and exhaust valves from cylinder head.. Clean carbon andgum deposit from the valves, valve seats, ports and guides. Inspect valves, valve seatsand guides. INTAKE VAL EXHAUST VAL VALVE COLLET /-". VALVE SPRING VALVE GUIDE u Fig. 5-15 Fig.
Step Parts to remove Main bearing cover 21 Remarks and procedures Fasteners Be careful not to damage the oil seal. Use a soft hammer and evenly tap around outer surfaceof cover. M8 Crr)x40;5 pcs. M8 (12T)X40 ; 2 P - Fig. 5-17 M8BOLT (12T) : 2 pcs. Fig.
Step Parts to remove I Remarks and procedures 22 Camshaft and tappets Be careful not to damage camshaft and tappets. 23 Balancer Position piston at top dead center and remove balancer. Fasteners i? I Fig- 5-79 Fig.
Step Parts to remove Fasteners Connecting rod andpiston (1) Remove connectingrod bolts and connecting rod cap. (2) Turn crankshaft until piston comes to top dead center, push out connecting rod and piston assembly through top of cylinder. *Scrape off all carbon deposits that might interfere with removal of piston from upperend of cylinder. Piston and piston pin (1) Remove clips andpiston pin to 24 25 Remarks and procedures M8 x 40 ; 2 pcs remove connecting rod from piston.
Step 26 Parts to remove Remarks and procedures .Tap lightly on flywheel end of crankshaft to remove from crankcase. Crankshaft I w Fig. 5-22 CRANKSHAFT - Fig.
B 5-4 REASSEMBLY PROCEDURES 0 PRECAUTIONS FOR REASSEMBLY 1) Clean parts thoroughly before reassembly. Pay most attentionto cleanliness of piston, cylinder, crankshaft, connecting rod and bearings. 2) Scrape off all carbon deposits from cylinder head,piston top and piston ring grooves. 3) Check lip of oil seals. Replaceoil seal if the lip is damaged. Apply oil to the lip before reassembly. 4) Replace all the gaskets with new ones. 5 ) Replace keys, pins, bolts, nuts, etc.,if necessary.
r L II I Fig. 5-26 MARK “1“ \ Fig. 5-27 5-4-3 PISTON AND CONNECTINGROD The direction of piston on connecting rod is not specified. Apply oil to the small end of connecting rod before assembling piston and piston pin. Use clips on the both side of the piston pin to secure piston pin in position. Fig.
(2) Install piston and connecting rod assembly into cylinder. Use a piston ring compressor to hold piston rings. The "FAN" mark of the connecting rod is to face flywheel side when assembled. Note: (1) Apply enough oil to piston rings, connecting rod bearings and cylinder bore beforeassembly. Fig. 5-29 (2) Set gaps of the piston rings90 degrees apart fromeach other before assembly. i/"- Fig.
CRANKSHFT GEAR Install balancer shaft to crankcase aligning matching mark of balancer gear and crank gear as shown in the illustration. ~~~ CAUTION : Incorrect timing of the gears will cause malfunction of the engine and may results in damage due to interference of the parts. ~~ TIMING MARKS 5-4-6 TAPPETS AND CAMSHAFT Fig. 5-32 (1) Oil the tappets andinstall them. Push in fully to avoid damage during camshaft installation. (2) Lubricate bearing surfacesof camshaft.
D 5-4-7-1 CRANKSHAFT END PLAY (Fortype D and type B) 1) Measure the depth“Al” (From the mating surfaceto the inner raceof the ball bearing.) 2) Measure the height“Bl” (From the mating surface to the crank gear.) (A1+0.35)-81= SIDE CLEARANCE (mm) (SIDE CLEARANCE)-0.2 mm =THICKNESS OF CRANKSHAFT SHIM (mm) (A1 +O.O14)-Bl= SIDE CLEARANCE (in.) (SIDE CLEARANCE)-0.008 in.= THICKNESS OF CRANKSHAFT SHIM (in.) Following are available spacershims. CRANKSHAFT SPACER SHIMS T= 0.6 mm (0.024 in.) T= 0.8 mrn (0.031in.
(2) Lubricate the oil seal and bearing surfaces. Add a light film of oil on main bearing cover faceto hold the gasket in place. Place spacers chosen at procedure (1) on crankshaft and camshaft. A Use an oil seal guide when installing mainbearing cover to avoid damaging the seal. Tap the cover into place with asoft hammer. NOTE ; Be sure to use two M8 (12T)'BOLTS andWASHERS in two locations just-the root of cylinder tofasten the main bearing coverto crankcase.
(4) Valve guides shouldbe replaced when valve stem clearance exceeds specifications (See “SERVICE DATA). Draw valve guides out and press new guides in. Refer to “SERVICE DATA for clearance specifications. After replacing valves and guides,lap valves in place until a uniform ring shows around the face of the valve. Clean valves and wash cylinder head thoroughly. (5) Install cylinder head to cylinder with new head gasket.
5-4-10 VALVE CLEARANCE ADJUSTMENT Note: flywheel in position for Temporally fit the easy operation. (1) Position pistonat top dead center of compres- sion stroke by matching the mark "T" of flywheel with the thread hole(@) of crankcase. (2) Loosen the nuton rocker arm and turn the pivot to adjust the clearance between rocker arm and valve stem end. I 1 'THREAD HOLE (01 Fig. 5-37 Tighten the nut on rocker arm. - - Valve clearance: 0.085 0.115 m m (0.0034 0.0045 in.
5-4-12 CY LlNDER BAFFLE Install cylinderbaffle to cylinder head. M6 x 8 mm flange bolt: 4 pcs. 5-4-13 FLYWHEEL MAGNETO (1) Install chargecoil to crankcase. (Option) Clamp coil wire to crankcase. Note: Be carefulnot to pinch coil wire between charge coiland crankcase. (2) Put woodruff keyin keywayof crankshaft. Wipe off oil and grease thoroughly from tapered portion of crankshaft and flywheel center hole. ~~ Fig. 5-39 (3) Install flywheel to crankshaft.
5-4-15 BLOWER HOUSING AND RECOIL STARTER (1) Attach blower housing to crankcase. Tighten five flange bolts. M6 x 12 mm flange bolt : 5 pcs. Insert the high tension cord from the ignition coil into the notch of the blower housing so that not to pinch the cord. (2) Install recoil starterto blower housing. M6 x 8 rnm flange bolt : 4 pcs. Note: Be careful of pulling direction of starter rope. 5-4-16 GOVERNOR, SPEED CONTROL SYSTEM AND CARBURETOR Install governor leverto governor shaft.
(5) Install carburetor to cylinder head hooking governor rod to governor lever and throttle lever of carburetor. Hook rod spring over governor rod. (6) Attach air cleaner baseto carburetor. Tightentwo flange nutsand a bolt. Connect breather pipe from rocker coverto cleaner base. VERNORGEAR GOVERNOR ROD FULL CLOSE GOVERNOR SPRlN PEED SELF LOCK NU ADJUSTING SCRE CARBURET0 Fig.
(7) Adjust governor system. (a) Turn the speed control lever all the way toward the high speed position and fix it by tightening self lock nut. (b) Check that governor lever is pulled by gov- GOVERNOR ernor spring and carburetor throttle valve is fully open. (c) Turn governor shaft counterclockwise all the way using a screw driver,and tighten lock bolt to secure the lever on the shaft. (d) Loosen the selfJock nut to allowthe speed control lever to move freely. Fig.
5-5 BREAK-IN OPERATION An engine that has been completely overhauled by being fitted with a new piston, rings, valves and connecting rod should be thoroughlyRUN-IN before being put backinto service. Good bearing surfaces and running clearances between the various parts can only be established by operating the engine under reduced speed andloads for a short period of time. While the engine is being tested, check for oil leaks. Make final carburetor adjustment and regulate the engine operating speed.
(2) At lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing control circuit operates to runthe base current I3 to turnthe signal transistor A “ON” allowing the current 11 to bypass as current 14. At this moment the power transistor turns “OFF”and the currenth is abruptly shut resulting in the high voltage generated inthe secondary coil which produces sparksat the spark plug. (3) At higher engine revoluti.
6-3WIRING DIAGRAM 0 STANDARD Ignition Coil Spark plug /// Flywheel Fig. 6-2 0 ENGINE WITH ELECTRIC STARTER Electric starter Magnetic Switch Fig.
7. AUTOMATIC DECOMPRESSION SYSTEM EH36, 41 engines are employingthe automatic decompression systemas a standard feature. This enables easy and light start of the engine. The automatic decompression system releases the compression of the engine by lifting up the exhaust valve at the cranking. Following are the explanation using type “D” engine as a sample how the system works. The components of the systems are different for the type “D” and “ B engines, however, the pinciple of the function is same.
8. CARBURETOR 8-1 OPERATION AND CONSTRUCTION 8-1-1 FLOAT SYSTEM The float chamber is located below the carburetor body and, with a float and a needle valve, maintains a constant fuel level during engine operation. The fuel flows from the fuel tank into the float chamber through needle valve. When the fuel rises to a specific level, the float rises, and when its buoyancy andfuel pressure are balanced, the needle valve closes to shutoff the fuel, thereby keeping the fuelat the predetermined level. Fl Fig.
8-1-2 PILOT SYSTEM n The pilot system feeds the fuel to the engine during idling and low-speed operation. The fuel is fed through the mainjet to the pilot jet, where it is metered, and mixed with the air metered by the pilot air jet. The fuel-air mixture isfed to the engine through the pilot outlet and the by-pass. At idling speed, the fuel is mainly fed from the pilot outlet. 8-1-3MAIN SYSTEM The main system feeds the fuel the to engine at mediumand high-speed operation.
B 8-2-2 CHOKE SYSTEM (1) Remove the Phillips screw (6) and choke valve(7),and pull out the choke shaft (8). (2) When reassembling the choke shaft, make sure that the cutout in the choke valve faces the pilot air jet. Meantime, when reassembling set the rings (9) and (1 0 ) at the right position. 8-2-3PILOT SYSTEM (1)Remove the pilot jet (ll), using correcttool to avoid damage to it. (2) Reassembly Tighten the pilotjet securely. Otherwise, the fuel may leak, causing engine malfunction.
9. STARTING SYSTEM 9-1 RECOIL STARTER Trouble in the recoil starter rarely happens while it is in normal operation. If the starter develops trouble or when it is lubricated, carry out in accordance with following disassembling and assembling procedures. Tools ; Box spanner (spanner) Pliers Screwdriver Nippers or Knife 9-1-1 HOW TO DISASSEMBLE (type D) (1) Remove the recoil starter from engine. (2) Pull the starter knob to draw, out the starter rope by about 30 cm and tie a tentative knot as show in Fig.
(5) Remove each part in accordance with Fig. 9-3 1. Center screw 2. Friction plate 3. Friction spring 4. Ratchet 5. Ratchet spring 6. Reel Take out the reel slowly while turning it back and forth gently, otherwise the spring may escape from the case which mayinvite danger. (If the spring escapes, put it in the housing by following procedures shownin Fig. 9-8.) Untie the starter rope knot at reel end and withdraw it to complete disassembling. STARTER SHAFT (Grease is to be applied) Fig.
(4) Pass the starter rope through the starter knob and tie the rope end to make a tight overhand knot as shown in Fig. 9-6. Then put the knot into the knob. (5) Pass the other end of the .rope from the starter case tothe reel andmake a knot asillustrated above, then put the rope end securely into the rope housingin the reel. (6) Wind the starter rope by1.5 turns in the arrow direction as shown in Fig.
I 9-1-3 CHECK AFTER REASSEMBLY (1) Pull the starter knob a few times to check if : A. The starter knob is too heavy to pull, check that each part has been assembledas specified. 8.The ratchet fails to function, check that parts such as friction spring have been missing. (2) Pull outthe starter knobto extend the rope to its extreme to seeif: A. The starter ropestill remains in the rope slot in the reel, unwind the rope1 by mm to 2 mm turns as the spring may be over-stressed. B.
9-2 ELECTRIC STARTER i " . I 1 NOTE; For Electric starter operation,electric wiring should be connected among electric starter, magnetic switch, key switch and battery as shown in the diagram. Black Unit Coil Ignition I . I Green I wire u "' Electric Magnetic starter Switch Fig. 9-9 9-2-1 OPERATION AND FUNCTION - When key switch is turned ON, lower electric current (M -) flows through coilof magnetic switch and the coil is excited.
9-2-2 COMPORNENT PARTS Fig.
The following three conditions must be fulfilled for satisfactory engine start. 1. The cylinderfilled with a proper fuel-air mixture. 2. Good compression in the cylinder. 3. Good spark, properly timed,to ignite the mixture. The engine cannot be started unless these three conditions are met. There are also other factors which make engine start difficult, e. g., a heavy load onthe engine whenit is about to start at low speed, and a high back pressure due to a long exhaust pipe.
(4) Incorrect Valve clearance If the correct compressionis not obtained even after remedyingthe above, disassemblethe engine and check further as follows : a) Valve stuck open due to carbonor gum on the valve stem. b) If the piston ringsare stuck on the piston, removethe piston and connecting rod from the.engine. Clean or replacethe parts. 10-1-3 IGNITION SYSTEM Check the followings for lack of sparks. (1) Wires of the ignition coil, sparkplug or contact breaker disconnected.
10-4 ENGINE OVERHEATS (1) Crankcase oil level low. Add oil immediately. (2) Spark timing incorrect. (3) Low grade gasoline is used, or engine is overloaded. (4) Cooling air circulation restricted. (5) Cooling air path misdirected causesloss of cooling efficiency. (6) Cylinder head cooling fins clogged up with dirt. (7) Engine operatedin an enclosed space without sufficient cooling air. (8) Exhaust gas discharge restricted, or carbon deposits in the combustion chamber.
I B Q 11. INSTALLATION Enginelife,easeofmaintenance and inspection,frequency of checksandrepairs, and operatingcost all depend on the way in which the engineis installed. Reviewthe following instructions carefully for installing the engine. 11-1 INSTALLING When mountingthe engine, carefully examineits position, the methodof connecting it to a machine, the foundation, and the methodof supporting the engine.
12. SERVICE DATA 12-1 CLEARANCE DATA AND LIMITS Unit : mm (in: EH36EH41 ITEM STD Limit 0.05or less (0.002or less) 0.1 (0.004) 0.7 - 1 .O (0.028- 0.039) 2.0 (0.079) , ~ ~~ ' Valve seat contactwidth IN. EX. Valve guide inside dia. A 6.035 - 6.053 (0.2376- 0.2383) - 60- 6.15 (0.
Unit : mm (in) EH36EH41 STD Limit 89.000- 89.022 (3.504- 3.505) To be rebored when he difference between nax. and min. of iiameter reachedto ~ :YLINDER Inside dia. STD 1.1 (0.004). ' 1 st reboring 89.250- 89.272 (3.514- 3.515) 2 st reboring 89.500- .89.522 (3.524 "3.525) Ditto Roundiness after reboring. 0.01 (0.004) ' Cylindricity after reboring. 0.015 (0.0006) 'I ST0N ' Piston size (At skirt in thrust direction) t - STD 88.96 80.98 (3.502- 3.503) 88.07 (3.499) 1 sto/s 89.21 - 89.
Unit : mm (in) EH36EH41 ITEM STD Limit 0.05 - 0.09 (0.002 - 0.0035) 0.15 (0.006) 0.03 - 0.07 (0.0012 - 0.0028) 0.1 5 (0.006) 0.045-0.140 (0.0018 - 0.0055) 0.20 (0.008) 20.989 - 21.002 (0.826 - 0.827) 21.035 (0.8281) 20.991 - 21 .OOO (0.8264 - 0.8268) 20.960 (0.8251) 0.025 - 0.064 (0.0010 - 0.0025) 0.25 (0.0098) 0.15 - 0.35 (0.0059 - 0.0138) 1.5 (0.0591) 2nd 0.4 - 0.6 (0.0157 - 0.0236) 1.5 (0.0591) Oil ring 0.2- 0.7 (0.0079- 0.0276) 1.5 (0.
Unit : mm (in EH36EH41 ITEM Limit STD CONNECTING ROD Big end inside dia. 38.000 - 38.016 (1.4961- 1.4967) 38.100 (1.5000) 120' Clearance between big end and crankpin ~~ 0.030- 0.060 (0.0012- 0.0024) 0.2 (0.0079) 21.010 - 21.023 (0.8272- 0.8277) 21.080 (0.8299) 0.010- 0.032 (0.0004- 0.0013) 0.12 (0.0047) 0.1 - 0.7 (0.0039- 0.0276) 1 .o (0.0394) 37.956 - 37.970 (1.4943- 1.4949) 37.85 (1.4902) Small end inside dia.
EH36EH41 ITEM Limit STD CAMSHAFT Cam height (1N. and EX.) I * Journal outside dia. a 35.26- 35.46 (1.3882 1.3961) - 35.1 1 (1.3823) Dl 24.967 - 24.980 (0.9830- 0.9835) 24.950 (0.9822) D2 19.967 - 19.980 (0.7861- 0.7866) 19.950 (0.7854) IN. 5.970 - 5.985 (0.2350- 0.2356) 5.850 (0.2303) EX. 5.960 - 5.975 (0.2346- 0.2352) 5.850 (0.2303) IN. 0.050- 0.083 (0.0022- 0.0033) 0.30 (0.01 18) EX. 0.060- 0.093 (0.0024- 0.0037) 0.30 (0.01 18) "D" type D VALVE * Valve stem outside dia.
Unit : mm (in) EH36EH41 I ITEM STD Limit TAPPET Stem outside dia. 7.960- 7.975 (0.3134- 0.3140) 7.93 (0.3122) 8.00- 8.015 (0.3150- 0.3156) 8.08 (0.31 81 0.025 - 0.055 (0.0010- 0.0022) 0.1 5 (0.0059) VALVE SPRING FREE LENGTH 36.5 (1.4370) ~~ ~~ VALVE SEAT ANGLE (IN. and EX.) Valve cutter angle (a) * Valve contact width (b) U a : 90" b : 0.7- 1 .O (0.028- 0.039) l a - 65- 2.0 (0.
12-2 TORQUE SPECIFICATIONS I ITEMS I Cylinder bolts I Connectingrod cap I Flywheel nut I head Main bearing cover bolts Tightening torque I I I 1 33.3 -41.2 22.1 - 27.0 bolts I 78.4 - 98.0 M8(1~ T ) - ~ P c s . 22.5 -230 24.5 M8 ( ~ T ) - ~ P c s . 16.7 - 18.6 New one 11.8 - 14.7 Spark plug 24.6 - 30.4 -F- 225 - 275 19.9 I 800 - 1000 - 26.5 Retightening I 340 - 420 ~~~ 58.0 - 72.5 - 250 16.7 - 18.1 I70 - 190 12.3 - 13.7 120 - 150 8.7 - 10.9 230 - 270 22.6 16.6 - 19.
w 13. MAINTENANCE AND STORAGE The following maintenance jobs apply when the engine is operated correctly undernormal conditions. The indicated maintenance intervals are by no means guaranteesfor maintenance free operationsduring these intervals. For example, if the engine is operated in extremely dusty conditions, the air cleaner should be cleaned every day insteadof every 50 hours. 13-1 DAILY MAINTENANCE REMARKS MAINTENANCE ITEMS Governor linkage is especially sensitive to dust.
13-4 EVERY 100-200 HRS. (MONTHLY) MAINTENANCE , " . MAINTENANCE ITEMS REMARKS 1) Clean fuel filter and fuel tank. Remove blower housing and clean up between fins and housina. 2) Inspect cooling system and remove dirt and chaff. 13-5 EVERY 500-600 HRS. MAINTENANCE MAINTENANCE ITEMS REMARKS Carbon deposits in combustion chamber causes lack of power. 1) Remove carbon from cylinder head. 2) Disassemble and clean carburetor. 13-6 EVERY 1000 HRS.
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