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CONTENTS Section Tifle Page 1 . SPECIFICATIONS ....................................................................................................... 1 2 . PERFORMANCE ........................................................................................................ 2 2-1 MAXIMUM OUTPUT ......................................................................................................... 2 2-2 MAXIMUM TORQUE .......................................................................
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Section Title Page 8 . CARBURETOR ........................................................................................................ 47 8-1 OPERATION AND FUNCTION ....................................................................................... 47 8-2 COMPORNENT PARTS ................................................................................................. 49 9 . ELECTRIC STARTER ..........................................................................................
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1 SPECIFICATIONS MODEL EH63V EH65V Air-Cooled, 4-Cycle, V-Twin Cylinder, Type Vertical P.T.O. Shaft, OHV Gasoline Engine x Stroke 2-80 mm x 65 mm (3.15 x 2.56 in.) Bore Piston Displacement 653 cm3 (39.8 cu.in.) Compression Ratio 8.3 Maximum Output kW (18.0 HP) /3600 r.p.m. 16.4 kW (22.0 HP) /3600 r.p.m. 13.4 43.3 N.rn(4.41 kgf - m) /2000 r.p.m. Max. Torque 45.6 N.rn(4.65 kgf m) /2500 r.p.m. Direction of Rotation Counterclockwise as viewed from P.T.O. shaft side Cooli
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2. PERFORMANCE 2-1 MAXIMUM OUTPUT The maximum output is the output of a .n engine with its throttle valve fully open led under the c mdition that all the moving parts are properly broken 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. NOTE : Power curves shown in the following charts are made in conformity with SAE internal combustion engine standard test
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2-3 PERFORMANCE CURVES EH63V N-m (kgf-m) 45 (4.59) t 35 (3.57) MAXIMUM TORQUE .I I MAXIMUM HORSEPOWER - 15 (20.1 1 I t I t 10 (1 3.4) 5 (6.7) 2000 2400 2800 3200 3600 SPEED - r.p.m - 3-
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EH65V N-m X /1 W 3 35 (3.57) 0 K 0 /MAXIMUM TORQUE F I I MAXIMUM HORSEPOWER \I I I 15 (20.1 /" 10 (1 3.4) 5 (6.7) 2000 2400 2800 3200 3600 SPEED - r.p.m - 4-
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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 for various powered equipments. The forged steel crankshaft and high loading direct supporting
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4. GENERAL DESCRIPTION OF ENGINE COMPONENTS /" ROBIN EH63V/ 65V series engine is air-cooled, 4-stroke, twin-cylinder, OHV arrangement gasoline en- gine. The twin-cylinder is located in the angle of 90 degree; #I 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
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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 car- ries 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. 3 pieces. The oil ring is designed for better sealing and less
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4-7 CYLINDER HEAD The cylinder head is an aluminum die-casting f' 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 cool- ing air to the exhaust valve area for the optimum cooling. ,A Hard alloy valve seats are molded in the cylinder head and stellite is fused to the exhaust valve
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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 effi- ciently. 4-11 LUBRICATION SYSTEM The engine is furnished with full pressure lubrica- tion 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 por- tions of crankshaft an
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4-14 CARBURETOR The engine is equipped with a horizontal draft car- buretor 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. Fuel cut solenoid valve is provided to prevent en- gine running on when the key switch is turned to Off - 4-15 AIR CLEANER CLEANER COVER Air-cleaner is a heavy-duty type with a dual ele- WING NUT m
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4-17 SECTIONAL VIEW OF ENGINE \ CAMSHAFT / oti PUMP CRANKSHAFT Fig. 4-15 - 11 -
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OIL PRESSURE SWITCH CRANKSHAFT PISTON RING CARBURETOR ROCKER COVER ELECTRIC SPARK PLUG CYLINDER INTAKE AND Fig. 4-16 - 12 - STARTER HEAD EXHAUST VALVES FUEL PUMP
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5. DISASSEMBLY AND REASSEMBLY 5-1 PREPARATIONS AND SUGGESTIONS When disassembling the engine, memorize the locations of individual parts so that they can be reas- sembled 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,
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5-3 DISASSEMBLY PROCEDURES w ,"-. Parts to remove Fasteners Step Remarks and procedures Engine oil drain Drain engine oil by removing plugs located on both sides of crankcase. 1 OIL DRAIN Fig. 5-2 - 14-
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Parts to remove Fasteners Step Remarks and procedures Air cleaner cover and elements 2 Remove breather pipe from #1 M6 nut ; 2 pcs. 3 Air cleaner base cylinder head. CLEANER BASE GASKET, cleaner /””“ /- ”_ CLEANER COVER BREATHER PIPE Fig. 5-3 Fig. 5-4 15 -
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Parts to remove I Remarks and procedures I Fasteners 1 I I I I I I I 1 /1 M6x14 ; 1 pce. 1 4 I Fuel pump bracket Remove pulse pipe and fuel pipe. M6x28 ; 1 pce. I I Rotating screen and M4x20 ; 4 pcs. 5 Blower housing M6x14 ; 6 pcs. M4 SCREW AND WASHER : 4 pcs. -/ PULSE PIPE 4 RT U I FUEL FILTER Fig. 5-5 - 16- I”’
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Parts to remove Fasteners Step Remarks and procedures Carburetor Take out carburetor along with 6 governor rod, rod spring and choke control rod. Governor lever and speed control bracket M5 BOLT AND INSULATOR @ WASHER : 1 pce. \ FLANGE BOLT CHOKE CONTROL : 1 pce. ! ROD SPACER BRACKET, speed control M6 NUT : 1 pce. \ / M5 NUT M5 BOLT AND GOVERNOR LE :1 pce. WASHER : 1 pce. -.J RETURN SPRlN 'P 1 I 3 : 1 pce. \ M5B0LT ROD SPRING \ SPEED CONTROL LEVER M
