SERVICE MANUAL Model EH65 Engine PUB-ES1113 Rev.
940 Lively Blvd. Wood Dale, IL 60191 Phone: 630-350-8200 Fax: 630-350-8212 e-mail: sales@robinamerica.com • www.robinamerica.com EH65 © Copyright 1998 Robin America, Inc.
CONTENTS Section Title Page 1. SPECIFICATIONS ....................................................................................................... 1 2. PERFORMANCE ........................................................................................................ 2 2-1 MAXIMUM OUTPUT ......................................................................................................... 2-2 CONTINUOUS RATED OUTPUT .....................................................................................
Section Title Page 7. LUBRICATION SYSTEM ......................................................................................... 46 7-1 OPERATION AND FUNCTION .......................................................................................46 8. CARBURETOR ........................................................................................................ 47 8-1 OPERATION AND FUNCTION .......................................................................................
1. SPECIFICATIONS MODEL Type EH63D EH64D EH65D Air-Cooled, 4-Stroke, V-Twin Cylinder, Horizontal P.T.O. shaft, OHV Gasoline Engine Bore x stroke 2 - 3.15 in x 2.56 in (80 mm x 65 mm) Displacement 39.9 cu. in. (653 cm3) Compression Ratio Continuos output kW (HP) / rpm Maximum output kW (HP) / rpm Max. Torque N-m (kgf-m) / rpm Direction of Rotation 8.3 10.8 (14.5) / 3,600 11.9 (16.0) / 3,600 13.4 (17.0) / 3,600 13.4 (18.0) / 3,600 15.3 (20.5) / 3,600 16.4 (22.0) / 3,600 43.3 (4.
2. PERFORMANCE 2-1 MAXIMUM OUTPUT The maximum output is the output of an engine with its throttle valve fully opened under the condition that all the moving parts are properly worn in after the initial break-in period. A new engine may not produce full maximum output while its moving parts are still not broken-in.
2-4 PERFORMANCE CURVES EH63D 35 (3.57) MAXIMUM TORQUE 15 (20.1) TORQUE 45 (4.59) N-m (kgf-m) MAXIMUM HORSEPOWER HORSEPOWER kW (HP) 10 (13.4) CONTINUOUS RATED HP RECOMMENDED HORSEPOWER RANGE 5 (6.7) 2000 2400 2800 3200 REVOLUTION 3600 r.p.
EH64D 35 (3.57) MAXIMUM TORQUE TORQUE 45 (4.59) N-m (kgf-m) MAXIMUM HORSEPOWER 15 (20.1) HORSEPOWER kW (HP) CONTINUOUS RATED HP 10 (13.4) RECOMMENDED HORSEPOWER RANGE 5 (6.7) 2000 2400 2800 3200 REVOLUTION 3600 r.p.
EH65D 35 (3.57) MAXIMUM TORQUE TORQUE 45 (4.59) N-m (kgf-m) MAXIMUM HORSEPOWER 15 (20.1) HORSEPOWER kW (HP) CONTINUOUS RATED HP 10 (13.4) RECOMMENDED HORSEPOWER RANGE 5 (6.7) 2000 2400 2800 3200 REVOLUTION 3600 r.p.
3. FEATURES The overhead valve arrangement is adopted for ensuring high power, low fuel consumption and low oil consumption. The adoption of twin-cylinder in the angle of 90 degree (V arrangement) and crankcase in one piece, plastic blower housing etc. offers a compactness and light weight, making the arrangements for installing the engine much easier into many kinds of power equipments.
4. GENERAL DESCRIPTION OF ENGINE COMPONENTS ROBIN EH63D/ 64D/ 65D series engine is air-cooled, 4-stroke, twin-cylinder, OHV arrangement gasoline engine. The twin-cylinder is located in the angle of 90 degree; #1 cylinder is in the RH side and #2 cylinder in LH side as viewed from flywheel (cooling fan) side. 4-1 CYLINDER AND CRANKCASE The twin-cylinder and crankcase is single piece aluminum die-casting. The cylinder liner, made of special cast iron, is molded into the aluminum casting.
4-4 CONNECTING ROD AND PISTON The connecting rod is forged aluminum alloy, and its large and small ends function as bearings. The piston is an aluminum alloy casting, and carries two compression rings and one oil ring. Fig. 4-4 4-5 PISTON RINGS The piston rings are made of special cast iron. The profile of the top ring is barrel face and the second ring has a tapered face. The oil ring is designed for better sealing and less oil consumption, in combination with 3 pieces.
4-7 CYLINDER HEAD The cylinder head is an aluminum die-casting which utilizes semi-spherical type combustion chamber for the high combustion efficiency. Fig. 4-7 4-8 VALVE ARRANGEMENT The intake valve is located on flywheel side of the cylinder head. The cooling fins and passages design lead cooling air to the exhaust valve area for the optimum cooling. Hard alloy valve seats are molded in the cylinder head and stellite is fused to the exhaust valve face. INTAKE VALVE EXHAUST VALVE Fig.
4-10 COOLING SYSTEM The large fins on the flywheel provide sufficient cooling air capacity for cylinder and cylinder head. The cylinder baffle helps the cooling air flow efficiently. 4-11 LUBRICATION SYSTEM The engine is furnished with full pressure lubrication system. The trochoid type oil pump is driven by crankshaft and delivers pressurized engine oil through the full-flow type oil filter to the journal and pin portions of crankshaft and camshaft.
4-14 CARBURETOR The engines are equipped with a down draft carburetor that has a float controlled fuel system and a fixed main jet. The carburetors are calibrated carefully for the sure starting, good acceleration, low fuel consumption and sufficient output. Fuel cut solenoid valve is provided to prevent engine running on when the key switch is turned to off. Fig.
4-17 SECTIONAL VIEW OF ENGINE CARBURETOR INTAKE MANIFOLD IGNITION COIL P.T.O.SHAFT OIL PUMP MAIN BEARING COVER FLYWHEEL OIL PUMP FILTER Fig.
AIR CLEANER GOVERNOR LEVER CAMSHAFT PUSH ROD ROCKER ARM INTAKE AND EXHAUST VALVES FUEL PUMP SPARK PLUG TAPPET PISTON RING GOVERNOR GEAR OIL FILTER ELECTRIC STARTER PISTON OIL PRESSURE SWITCH PISTON PIN CRANKCASE CRANKSHAFT Fig.
5. DISASSEMBLY AND REASSEMBLY 5-1 PREPARATIONS AND SUGGESTIONS When disassembling the engine, memorize the locations of individual parts so that they can be reassembled correctly. If you are uncertain of identifying some parts, it is suggested that tags be attached to them. Have boxes ready to keep disassembled parts by group. To prevent losing and misplacing, temporarily assemble each group of disassembled parts. Carefully handle disassembled parts, and clean them with washing oil if necessary.
5-3 DISASSEMBLY PROCEDURES Step Parts to remove Engine oil drain 1 Remarks and procedures Fasteners Drain engine oil by removing plugs located on both side of crankcase. OIL FILLER CAP GASKET OIL LEVEL GAUGE STEP 1 GASKET OIL DRAIN PLUG (ON BOTH SIDE) Fig.
Step 2 3 Parts to remove Air cleaner cover and elements Remarks and procedures Remove breather pipe from #1 cylinder head. Fasteners 10-32x11mm ; 3 pcs. Air cleaner base WING NUT CLEANER COVER BREATHER PIPE STEP 2 Fig. 5-4 FLANGE BOLT (Inch) : 3 pcs. STEP 3 CLEANER ELEMENT CLEANER BASE Fig.
Step Parts to remove Remarks and procedures Fasteners 4 Blower housing M6x12 ; 8 pcs. 5 Chock control lever and link M6 LINK PIVOT CHOKE WAVED CONTROL ROD WASHER M5 TAPPING SCREW : 1 pce. BLOWER HOUSING CLAMP CHOKE KNOB RETURN SPRING CHOKE CONTROL LINK STEP 5 STEP 4 M6 FLANGE BOLT : 8 pcs Fig.
Step Parts to remove Carburetor 6 Remarks and procedures M8x80 ; 2 pcs. At first remove fuel pipe. Take out carburetor along with governor rod and rod spring. M8 FLANGE BOLT : 2 pcs. CARBURETOR FUEL PIPE Fig. 5-7 GASKET, carburetor STEP 6 Fig.
Step Parts to remove 7 Governor lever and Speed control lever 8 Speed control bracket unit Remarks and procedures Fasteners M6X12 ; 3 pcs M6 self-lock nut Governor lever ; Remove bolt and take out lever. Speed control lever ; 1. Governor spring 2. Self lock nut 3. Stop plate 4. Spring washer 5. Speed control lever M6X12 ; 3 pcs GOVERNOR ROD ROD SPRING M6 NUT : 1 pce. M6 SELF LOCK NUT : 1 pce. STOP PLATE SPRING WASHER FRICTION WASHER M6 BOLT AND WASHER : 1 pce.
Step 9 Parts to remove Remarks and procedures Fasteners Fuel pump Remove pluse a pipe at first. M6x12 ; 2 pcs Ignition coil 1. Take out plug cap. 2. Remove ignition coil. 3. Cut out stop wire fixing bands. 4. Disconnect stop wires from ignition coil. M6x30 bolt & washer ; 4 pcs. 10 PLUG TERMINAL STEP 10 IGNITION COIL SPARK PLUG CAP M6 BOLT AND WASHER ASSY : 2 pcs. M6 BOLT AND WASHER ASSY : 2 pcs. TO STOP DIODE IGNITION COIL PLUG TERMINAL SPARK PLUG CAP M6 FLANGE BOLT : 2 pcs.
Step 11 Parts to remove Remarks and procedures Fasteners Cylinder baffles (#1, #2,#3 & #4) M6X12 CYLINDER BAFFLE #3 M6 FLANGE BOLT : 3 pcs. STEP 11 M6 FLANGE BOLT : 2 pcs. CYLINDER BAFFLE #1 CYLINDER BAFFLE #4 M6 FLANGE BOLT : 3 pcs. M6 FLANGE BOLT : 3 pcs. Fig.
Step 12 13 Parts to remove Remarks and procedures Fasteners M8 flange nut ; 4 pcs. Intake manifold Spark plug NGK:BP6ES or BPR6ES (or CHAMPION: N9YC or RN9YC) M8 FLANGE NUT : 2 pcs. SPARK PLUG STEP 12 INTAKE MANIFOLD STEP 13 GASKET, muffler M8 FLANGE NUT : 2 pcs. GASKET, muffler SPARK PLUG STEP 13 Fig.
Step 14 15 Parts to remove Remarks and procedures Fasteners Rocker cover M6x12 ; 4 pcs. Cylinder head and Push rod 1. Rocker arm shaft 2. Rocker arm When removing rocker arm and shaft, turn and adjust flywheel at TDC with the marking "T" faced to "1" or "2" on each cylinder head. Put the marking of original position onto each push rod, rocker arm and valve for reassembly. M10x65 ; 8 pcs. M6X12 ; 2 pcs M6 FLANGE BOLT : 4 pcs. LIFT HOOK PUSH ROD M8 NUT : 2 pcs.
Step 16 Parts to remove Remarks and procedures Intake & exhaust valves Breather cover Breather plate STEP 16 SPRING RETAINER SPRING RETAINER COLLET -VALVE COLLET -VALVE VALVE SPRING VALVE SPRING WASHER WASHER Fig. 5-15 GASKET BREATHER GASKET, breather BREATHER COVER M6 FLANGE BOLT : 2 pcs. EXHAUST VALVE INTAKE VALVE Fig.
Step 17 18 Parts to remove Flywheel Remarks and procedures Fasteners Remove key from crankshaft and then pull out flywheel by using puller. M18 nut, washer, spring washer Charge coil M5 x 20 ; 4 pcs. M18 NUT : 1 pce. STEP 17 SPRING WASHER WASHER M5 BOLT AND WASHER : 4 pcs. Fig. 5-17 STEP 18 CHARGE COIL FLYWHEEL RING GEAR Fig. 5-16 Fig. 5-18 Fig.
Step Parts to remove Remarks and procedures Main bearing cove Fasteners Take out key from PTO shaft. Rap PTO shaft with polyvinyl tape not to damage oil seal by key groove edge. 19 M8x44 ; 10 pcs. GOVERNOR SLEEEVE GOVERNOR GEAR WASHER : 2 pcs. GOVERNOR GEAR SHAFT THRUST BEARING M8 FLANGE BOLT : 10 pcs. GASKET STEP 19 MAIN BEARING COVER Fig. 5-20 Fig.
Step Parts to remove Camshaft and tappet 20 Remarks and procedures Mate the markings both on crankshaft gear and camshaft gear and then take out camshaft . Put the marking of original position onto each tappet for reassembly. CAMSHAFT Fig. 5-23 TAPPET STEP 20 TAPPET CAMSHAFT Fig.
Step Parts to remove Remarks and procedures Piston and Connecting rod *Piston pin clip *Piston pin *Piston rings 1. Remove connecting rod bolts. 2. Take out connecting rod cap. 3. Push the connecting rod upwards and take out along with piston. Fasteners M8 ; 4 pcs. 21 Put the marking of original position onto each piston, ring, clip, piston pin, connecting rod and cap for reassembly.
Step 23 Parts to remove Remarks and procedures Fasteners Crankcase *Oil pump *Oil filter *Oil pressure switch *Oil pump filter *Oil relief spring & ball *Electric starter *Governor lever shaft M8x65 ; 2 pcs 10-32x11 M6 FLANGE BOLT : 4 pcs. OUTER ROTER INNER ROTOR O RING M8 FLANGE BOLT : 2 pcs. STEP 23 BRACKET, magnetic switch OIL PUMP COVER SNAP PIN WASHER OIL FILTER ELECTRIC STARTER 10-32 FLANGE BOLT (Inch) : 1 pce.
5-4 REASSEMBLY PROCEDURES 5-4-1 PRECAUTIONS FOR REASSEMBLY 1) Clean parts thoroughly before reassembly. Pay most attention to 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. Replace oil 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.
B. CYLINDER HEAD, VALVES and ROCKER ARM NOTE ; * Clean valves and wash cylinder head thoroughly. * Remove carbon and gum deposits from the valves, seats, ports and guides. * Inspect valves, valve seats and valve guides. * Replace valves that are badly burned, pitted or warped. * Valve guides should be replaced when valve stem clearance exceeds specifications. (Refer to SERVICE DATA for clearance specifications. ) If exceeds, draw valve guides out and press new guides in.
C. PISTON and CONNECTING ROD (1) Install oil ring first, then second ring and top ring. Spread ring only far enough to slip over piston and into correct groove. Use care not to distort ring. NOTE ; * Install second ring with punched mark beside the gap on the top side. * Top ring can be fit either way. * As for oil ring, rails should be placed on and below the expander. (2) Apply enough oil to small end of connecting rod and piston pin, and fix connecting rod to piston with piston pin.
5-4-3 Re-assembly CRANKSHAFT 1) CRANKSHAFT Install crankshaft onto crankcase. Note: Apply enough oil to bearing portion of crankcase. For easy installation, put crankcase on box or wood blocks. 2) PISTON and CONNECTING ROD Fig. 5-31 (1) Install piston and connecting rod assembly into cylinder by using a piston ring compressor to hold piston rings.
5) MAIN BEARING COVER (1) Put a oil seal guide onto PTO shaft portion to avoid damaging the main bearing cover oil seal. (2) Place gasket onto the mating surface of crankcase. (3) Lubricate oil seal lip potion and bearing surfaces, and install main bearing cover. Tighten bolts evenly to the specified torque. Tightening Torque : 16.7 - 18.6 N-m (170 - 190 kg-cm, 12.3 - 13.7 ft-lb.
(3) Insert push rods into the concave portion of tappet and set the other end to the concave portion of rocker arm adjust screw with valve spring depressed. (4) Temporally tighten adjust screw. 9) VALVE CLEARANCE ADJUSTMENT NOTE : Temporally fit the flywheel in position for easy operation. (1) Rotate crankshaft clockwise to the TDC (top dead center) of compression stroke by matching the mark "T" of flywheel with the mark "1" of #1 cylinder head.
10) ROCKER COVER Install rocker cover with new gasket. Tightening Torque : 2.9 - 4.9 N-m (30 - 50 kg-cm, 2.2 - 3.6 ft-lb.) 11) BREATHER PIPE and COVER Attach breather plate (breather valve) and breather cover to crankcase using proper gaskets. GASKET BREATHER Put breather plate in such position as its reed valve opens outside. GASKET, breather BREATHER COVER Tightening Torque : 2.9 - 4.9 N-m (30 - 50 kg-cm) (2.2 - 3.6 ft-lb.) Note: M6 FLANGE BOLT : 2 pcs.
14) STARTER MOTOR Install starter motor. Tightening Torque : 16.7 - 18.6 N-m (170 - 190 kg-cm) (12.3 - 13.7 ft-lb.) 15) CYLINDER BAFFLE Attach cylinder baffle #1, #2, #3 and #4. 16) INTAKE MANIFOLD M8 FLANGE NUT : 2 pcs. Set gasket (stainless steel) onto both #1 and #2 cylinder head and install intake manifold. Tightening Torque : 16.7 - 18.6 N-m (170 - 190 kg-cm) (12.3 - 13.7 ft-lb.) INTAKE MANIFOLD GASKET, muffler 17) FLYWHEEL M8 FLANGE NUT : 2 pcs. (1) Put woodruff key in the keyway of crankshaft.
19) CARBURETOR Set gasket onto intake manifold and install carburetor. Tightening Torque : 16.7 - 18.6 N-m (170 - 190 kg-cm) (12.3 - 13.7 ft-lb.) 20) GOVERNOR LEVER GOVERNOR SHAFT Attach governor rod and rod spring between governor lever and carburetor throttle lever, and insert the governor lever to governor lever shaft. Tighten locking bolt temporarily. GOVERNOR LEVER ROD SPRING GOVERNOR ROD THROTTLE LEVER Fig.
21) SPEED CONTROL LEVER Install speed control bracket onto intake manifold. Attach return spring, spacer, friction washer, wing nut, etc. to speed control lever as shown in the illustration. Attach governor spring between governor lever and speed control lever. Attach chock control link between carburetor chock lever and chock control lever.
22) ADJUST GOVERNOR SYSTEM (1) Push speed control lever all the way to the high speed position and fix it by tightening nut. (2) Check that governor lever is pulled by governor spring and carburetor throttle valve is fully open. (3) Turn governor shaft counterclockwise all the way and tighten lock bolt to secure the lever on the shaft. GOVERNOR LEVER GOVERNOR SHAFT 23) BLOWER HOUSING Attach blower housing to crankcase. Fig. 5-46 24) FUEL PUMP Install fuel pump onto #2 cylinder baffle.
26) OIL PRESSURE SWITCH OIL PRESURE SWITCH Install oil pressure switch onto crankcase. Tightening Torque : 5.9 - 9.8 N-m (60 - 100 kg-cm) (4.3 - 7.2 ft-lb.) Fig. 5-49 27) OIL FILTER Apply oil to O-ring and install oil filter by tightening about 3/4 turns after attaching crankcase surface. Tightening Torque : About 12.3 N-m (About 125 kg-cm) (About 9.0 ft-lb.) O-RING OIL FILTER OIL FILTER 3/4 TURNS 28) FUEL PUMP PLUSE PIPE Connect fuel pipe between fuel pump and crankcase nipple. Fig.
30) Refill engine oil and start the engine. Engine oil will be lubricated oil passages and oil filter. Check the engine oil level and refill again to the upper level of oil level gauge. OIL GAUGE UPPER LEVEL Note: * Total engine oil capacity is about 1.55 L. * Use "SE" (API classification) or higher grade engine oil. LOWER LEVEL Fig.
6. MAGNETO 6-1 OPERATION AND FUNCTION The ignition system is pointless flywheel magneto with automatic advancing characteristic. Being different from the breaker point type ignition system, this system is completely free from such troubles as starting-up failure owing to dirty, burnt or corroded point surface.
(2) At lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing control circuit operates to run the base current I3 to turn the signal transistor A "ON" allowing the current /1 to bypass as current I4. At this moment the power transistor turns "OFF" and the current I2 is abruptly shut resulting in the high voltage generated in the secondary coil which produces sparks at the spark plug.
7. LUBRICATION SYSTEM 7-1 OPERATION AND FUNCTION * Full lubrication system is adopted, in combination with large-size torchoid oil pump and cartridge type oil filter. * The large-size trochoid type oil pump is driven directly by crankshaft, and delivers pressurized engine oil to the journal and pin portions of crankshaft, camshaft etc. * The engine oil in the oil pan is fed trough the oil pump filter into oil pump and the engine oil pressure is adjusted by the relief valve after discharging from oil pump.
Fig. 8-1 - 47 - FUEL FUEL INLET PIPE NEEDLE VALVE MAIN NOZZLE BY-PASS THROTTLE VALVE FLOAT AIR VENT HOLE CHOKE VALVE MIXTURE TAMPER CAP PILOT OUTLET MAIN AIR JET PILOT AIR JET AIR PILOT JET MAIN JET FUEL CUT VALVE EMULSION TUBE 8.
8-1-1 FLOAT SYSTEM The float system is consists of a float and a needle valve, and 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 and fuel pressure are balanced, the needle valve closes to shut off the fuel, thereby keeping the fuel at the predetermined level.
8-2 COMPORNENT PARTS 19 3 4 7 5 6 2 12 18 11 13 9 17 8 14 10 16 1 15 Fig. 8-2 1. BODY, lower 11. MAIN JET 2. GASKET, body upper 12. SOLENOID VALVE ASS’Y 3. BODY, upper 13. JET, slow 4. LEVER ASSY, choke 14. NEEDLE, idle adjust 5. SPRING, choke 15. THROTTLE SHAFT ASS’Y 6. SHAFT ASSY, choke 16. THROTTLE VALVE 7. CHOKE VALVE 17. EXPANSION PLUG 8. VALVE, float 18. PLUG 9. FLOAT ASSY 19. O-RING 10. FLOAT PIN 20.
9-2 COMPORNENT PARTS ARMATURE BRUSH (4 pcs.) BRUSH HOLDER THROUGH BOLT (2 pcs.) PINION STOPPER CLIP SPACER PINION STOPPER PINION RETURN SPRING PINION ASSEMBLY GUIDE PLATE FRONT COVER YOKE ASSEMBLY Fig.
10. TROUBLESHOOTING The following three conditions must be fulfilled for satisfactory engine start. (1) The cylinder filled 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 on the engine when it is about to start at low speed, and a high back pressure due to a long exhaust pipe.
10-2 STARTING DIFFICULTIES Phenomenon 1. Low engine speed at starting 2. Ignition system malfunction 3. Fuel system malfunction 4.
10-3. INSUFFICIENT OUTPUT Phenomenon 1. Low compression 2. Ignition system malfunction 3. Fuel system malfunction 4.
10-5. ROUGH IDLING Phenomenon Possible causes Remedy 1) Low idling speed Adjust 2) Carburetor slow system passage clogged Check and clean 2. Intake system 1) Air mixing from connecting portion of air intake system Check , tighten or replace gasket 3.
10-7. HIGH FUEL CONSUMPTION Phenomenon 1. Fuel system 2. Engine core components Possible causes Remedy 1) Over-size main jet Replace 2) Needle valve faulty and/or high fuel level in float chamber Adjust or replace 3) Chock valve does not open fully. Repair or replace 1) Low compression Check or repair 2) Over cooling Check and adjust load and/or engine speed 10-8. DETONATION Phenomenon 1. Ignition system malfunction 2. Fuel system malfunction 3.
10-9. ENGINE MISFIRE Phenomenon 1.
11. INSTALLATION Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend on the way in which the engine is installed. Review the following instructions carefully for installing the engine. 11-1 INSTALLING When mounting the engine, carefully examine its position, the method of connecting it to a machine, the foundation, and the method of supporting the engine.
12. SERVICE DATA 12-1 CLEARANCE DATA AND LIMITS Unit : mm (in) EH63D/ 64D / 65D ITEM STD Limit 0.05 or less (0.002 or less) 0.1 (0.004) 0.7 - 1.0 (0.028 - 0.039) 2.0 (0.079) 6.035 - 6.053 (0.2376 - 0.2383) 6.15 (0.242) CYLINDER HEAD * Flatness * Valve seat contact width IN. EX. * Valve guide inside dia.
Unit : mm (in) EH63D/ 64D / 65D ITEM STD Limit STD 80.000 - 80.019 (3.1496 - 3.1504) To be rebored when the difference between max. and min. of diameter reached to 0.1 (0.004). 1 st reboring 80.250 - 80.269 (3.159 - 3.160) Ditto 2 st reboring 80.500 - 80.519 (3.169 - 3.170) ------------ 0.01 (0.004) ------------ 0.015 (0.0006) ------------ STD 79.968 - 79.988 (3.148 - 3.149) 79.878 (3.145) 1 st o / s 80.218 - 80.238 (3.158 - 3.159) 80.128 (3.155) 2nd o / s 80.468 - 80.488 (3.168 - 3.
Unit : mm (in) EH63D/ 64D / 65D ITEM PISTON * Ring groove side clearance STD Limit Top 0.05 - 0.09 (0.0002 - 0.0035) 0.15 (0.006) 2nd 0.03 - 0.07 (0.0012 - 0.0028) 0.15 (0.006) Oil ring 0.057- 0.175 (0.0022 - 0.0069) 0.15 (0.006) 20.989 - 21.002 (0.8263 - 0.8269) 21.035 (0.8281) 20.991 - 21.000 (0.8264 - 0.8268) 20.960 (0.8251) 0.012 - 0.051 (0.0005 - 0.0020) 0.25 (0.0098) Top 2nd 0.2 - 0.4 (0.0079 - 0.0157) 1.5 (0.0591) Oil ring 0.2 - 0.7 (0.0079 - 0.0276) 1.5 (0.
Unit : mm (in) EH63D/ 64D / 65D ITEM STD Limit 36.1 - 36.3 (1.4213 - 1.4291) 35.95 (1.4154) 19.967 - 19.980 (0.7861 - 0.7866) 19.950 (0.7854) IN. 5.970 - 5.985 (0.2350 - 0.2356) 5.85 (0.2303) EX. 5.960 - 5.975 (0.2346 - 0.2352) 5.85 (0.2303) IN. 0.050 - 0.083 (0.0022 - 0.0033) 0.30 (0.0118) EX. 0.060 - 0.093 (0.0024 - 0.0037) 0.30 (0.0118) CAMSHAFT * Cam height (IN. and EX.) * Journal outside dia. "D" type D VALVE * Valve stem outside dia. D *Clearance between valve stem dia.
Unit : mm (in) EH63D/ 64D / 65D ITEM STD Limit 8.960 - 8.975 (0.3528 - 0.3533) 8.93 (0.3516) 9.00 - 9.015 (0.3543 - 0.3549) 9.08 (0.3575) 0.025 - 0.055 (0.0010 - 0.0022) 0.15 (0.0059) 11.986 - 11.994 (0.4719 - 0.4722) 11.92 (0.4693) 12.006 - 12.024 (0.4727 - 0.4734) 12.07 (0.4752) 0.012 - 0.038 (0.0005 - 0.0015) 0.15 (0.0059) 39.5 (1.5551) ------------ TAPPET * Stem outside dia. * Guide inside dia. * Tappet guide clearance ROCKER ARM * Rocker shaft outside dia. * Rocker arm hole dia.
12-3 OIL GRADE CHART Use oil classified as SE or higher. Multi-grade oil tends to increase its consumption at high ambient temperature.
13. MAINTENANCE AND STORAGE 13-1 DAILY MAINTENANCE Every day before operating engine, check the following items; MAINTENANCE ITEMS REMARKS 1) Clean away dust and chaff from engine. Governor linkage is especially sensitive to dust. 2) Check fuel leakage from fuel system. If any, retighten fasteners or replace necessary parts. 3) Inspect for loose hardware and retighten if necessary. Loose bolts and nuts may come off and result in breakage of other parts. 4) Check oil level and add to full level.
Maintenance Items Every 8 hours (daily) Clean engine and check bolts and nuts X (Daily) Check and refill engine oil X (Refill daily to full level.
13-3 ENGINE STORAGE (1) Change the engine oil and perform the daily maintenance items above mentioned. (2) Drain fuel from carburetor float chamber. (3) To prevent rust in the cylinder bore, apply oil through the spark plug hole and turn the crankshaft several turns by hand. Reinstall the plug. (4) Turn the crankshaft by hand and leave it where the resistance is the heaviest. (5) Clean outside of the engine with oiled cloth.
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