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CONTENTS Section Title Page 1 . SPECIFICATIONS ....................................................................................................... 1 2 . PERFORMANCE ........................................................................................................ 3 2-1 MAXIMUM OUTPUT ........................................................................................................ 3 2-2 CONTINUOUS RATED OUTPUT .............................................................
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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 .....
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I EH36 ~~~ ~ ~ 1 MODEL EH36B EH36BS EH36DS EH36D I I I Air-Cooled, 4-Cycle, Single-Cylinder, Type Horizontal P.T.O. Shaft, OHV Gasoline Engine x Stroke 89 x 65 mm (3.50 x 2.56 in.) Bore Piston Displacement 404 cm3 (24.65 cu.in.) 8.3 Compression Ratio HP) /I800 r.p.m. 6.3 kW (8.5 HP) /3600 r.p.m. 6.3 kW (8.5 Continuous output 8.5 kW (1 1.5 HP) /1800 r.p.m. 8.5 kW (1 1.5 HP) /3600 r.p.m. Max. ~ 54.9 N - m (5.60 kgf - m) 27.4 N - m (2.80 kgf m) Max.
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EH41 I MODEL EH41 B EH41 BS EH41 D EH41 DS Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, OHV Gasoline Engine 89 x 65 mm (3.50 x 2.56 in.) I Bore x Stroke btonbisplacement 404 cm3 (24.65 cu.in.) 1 ~~ Empression Ratio 8.3 I 7.0 kW (9.5 HP) /1800 r.p.m. 7.0 kW (9.5 HP) 13600 r.p.m. Continuous Output Max. 9.9 kW (13.5 HP) /1800 r.p.m. 9.9 kW (13.5 HP) /3600 r.p.m. , 56.8 N m (5.80 kgf - m) 28.4 N - m (2.90 kgf m) Max. Torque /2500 r.
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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 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 code
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2-4 PERFORMANCE CURVES EH36 ( ) for type B kgf-m Nom (5.6) 2.8 :54) 27 (5.4) 2.7 :52) 26 (5.2) 2.6 t :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 kW 9.0 12 11 8.0 10 7.0 9 6.0 8 7 5.0 6 4.0 5 3.0 4 3 2.0 28 24 32 36 4) (1 6) (1 8) (1 2) (1 REVOLUTION r.p.m. - 4-
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EH41 ( for tvpe B kgfom Nom (5.8) 2.9 1 (56) 28 w (5.6) 2.8 - (54) 27 (52) 26 (5.2) 2.6 I- HP kW 14 10.0 13 9.0 12 11 8.0 10 7.0 9 6.0 8 7 5.0 6 4.0 5 3.0 4 3 2.0 20 24 28 x10 ’ (10) (12) (14) (16) (18) REVOLUTION r.p.m. - 5- 32 36
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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, making the 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. Combustion and mechanical nois
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4. GENERAL DESCRIPTION OF ENGINE COMPONENTS 4-1 CYLINDER AND CRANKCASE The cylinder and crankcase is a single piece alu- minum die-casting. The cylinder liner, made of special cast iron, is molded into the aluminum casting. The crankcase has a mounting surface on the out- put shaft side, where the main bearing cover is attached. I Fig. 4- 1 4-2 MAIN BEARING COVER The main bearing cover is an aluminum die-cast- ing, which is mounted on the output shaft
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4-4 CONNECTING ROD AND PISTON The connecting rod is an aluminum alloy die-cast- ing and its large and small ends function as bear- I ings. The piston is an aluminum alloy casting, and car- ries two compression rings and one oil ring. I 4-5 PISTON RINGS The piston rings are made of special cast iron. Fig. 4-4 The profile of the top ring is a barrel face and the second ring has a tapered face. The oil ring is designed for better sealing and less oil
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B The intake valve is located on flywheel side of the cylinder head. 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 area for 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.
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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 effi- ciently. 4-11 LUBRICATION SYSTEM All the rotating and sliding parts are splash- lubri- cated by the oil splasher on the connecting rod. I OIL SPLASHER Fig. 4- 10 P 4-12 IGNITION SYSTEM FLYWHEEL I The ignition system is a transistor controlled rnag- net0 system which
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4-13 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. For details, refer to page 47, section "8 CARBU- RETOR''. Fig. 4-72 4-1 4 AIR CLEANER KNOB Air-cleaner is a heavy-duty type with a dual ele- & ment system ; the primary one is an urethane foam
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4-16 DECOMPRESSION SYSTEM AUTOMATIC DECOMPRESSION SYSTEM An automatic decompression mechanism which opens exhaust valve before the piston reaches RETURN SPRING compression top is assembled on the camshaft for easy starting. Fig. 4- 15' - 12-
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4-17 SECTIONAL VIEW OF ENGINE MUFF P.T.O. MAIN BEARING COVER FLYWHEEL Fig. 4-16 - 13-
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FUEL I CAMSHAFT BALANCER SHAFT \ Fig. 4-17 - 14- CRANKSHAFT CRANKCASE TANK SPARK PLUG
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5. DISASSEMBLY AND REASSEMBLY 5-1 PREPARATIONS AND SUGGESTIONS 1) 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. 2) Have boxes ready to keep disassembled parts by group. 3) To prevent losing and mispfacing, temporarily assemble each group of disassembled parts. 4) Carefully handle disassembled parts, an
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5-3 DISASSEMBLY PROCEDURES fi Parts to remove Fasteners Remarks and procedures Step Engine oil drain (1) Remove oil drain plug and drain oil. 1 (2) To discharge oil quickly, remove oil gauge. OIL LEVEL GAUGE GASKET I OIL DRAIN PLUG Fig. 5-2 - 16-
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Parts to remove Fasteners Remarks and procedures Step cap nut Air cleaner cover and elements 2 M6 flange nut : Remove breather pipe from cylinder Air cleaner base and gasket head. 3 2 pcs. M6 x 28 : 1 pce. CAP NUT v fig. 5-3 - 17-
