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CONTENTS Section Title Page 1 . 2 . 3 . 4 . 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-1 0 4-1 1 4-1 2 4-1 3 4-1 4 4-1 5 4-1 6 4-1 7 5 . 6 . 7 . 8 .
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I. SPECIFICATIONS ~~ ~ ~~~ ~ ~ ~~ ~~ ~~~ ~~~~ ~~ ~~~ ~ ~ EH 12-2 Model EH12-2B EHl2-2D EH12-2BS EH12-2DS Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine TY Pe x 43 rnm (2.36 x 1.57 in.) Bore X Stroke 60 Piston Displacement 121 cm3 (7.38 cu.in.) Max. Torque 15 (1 52) /1300 7.5 (0.76) /2600 I Nem (kaf*m)/rDm Direction of Rotation Counterclockwise As Viewd From P.T.O. Shaft Side Cooling system Forced Air Cooling Valve Arrangement Overh
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EH17-2 Model EH17-2D EH17-2DS EH17-2B EH17-2BS Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine TY Pe ~~ ~~ ~~ ~~~~ ~ ~ Bore X Stroke 67 x 49 mrn (2.64 X 1.93 in.) 172 cm3 (10.50 cu.in.) . Compression Ratio 8.5 Continuous 2.6 (3.5) / 1500 2.9 (4.0) / 1800 2.6 (3.5) /3000 2.9 (4.0) /3600 Output Kw (HP)/rpm Max. 4.4 (6.0) /4000 4.4 (6.0) /2000 Max. Torque 21.4 (2.1 8) / 1300 1 0.7 (1 -09) / 2600 Nom (kgf*m)/rpm I I Direction of Rotati
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~~~~~~ ~~ ~ EH25-2 Model EH25-2 6 EH25-26s EH25-2D EH25-2DS Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine TY Pe Bore x Stroke 75 X 57 mm (2.95 X 2.24 in.) Piston Displacement 251 cm3 (15.31 cu.in;) 8.5 Compression Ratio Continuous 4.0 (5.5) I1 500 4.7 (6.4) / 1800 4.0 (5.5) /3000 4.7 (6.4) /3600 output Kw (HP)hm Max. 6.3 (8.5) /4000 6.3 (8.5) /2000 Max. Torque / 2600 33.1 (3.38) / 1300 16.6 (1.69) Nom (kgf*m)/rpm Direction of Rotat
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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. 2-2 CONTINUOUS RATED OUTPUT The continuous rated output is the output of an engine at optimum governed speed which is most favorable from
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2-4 PERFORMANCE CURVES 8 0 EHlPD, B for B type HP kW 4 3 2 3 + l2 n + 3 0 1 1 0 2000 3000 4000 (1 000) (1 500) (2000) REVOLUTION - r.p.m. -5-
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0 EH17D, 6 for B tvDe N.m kgfam 3000 4000 (1 000) (1 500) (2000) REVOLUTION - r.p.m. -6-
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EH25D, B N.m kgf-m r I I I I I I I I I 1.7 (3.4) I "- " 16.5 (33) 1 I I 1.6 (3.2) " 15.5 (31) MAXIMUM TORQUE AL\ I I I I I 1.5 (3.0) 14.5 (29) 1.4 (2.8) kW I I MAXIMUM HORSEPOWER '(NET) I HP -6 8 7 5 4 c I t: RECOMMENDED $4 I- & 2 1 I i 0 2000 3000 ' 4000 (1 000) (1 500) (2000) REVOLUTION - r.p.m. -7-
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3. FEATURES , , 1. The overhead valve design offers a compactness, light weight and ideal combustion characteristics resulting in more power from Iess fuel and prolonged engine life. 2. An optimum lubrication and better tilted operation thanks to upright cylinder design. 3. A crossflow arrangement of intake and exhaust ports ensures stable performance under high ambient temperature. 4. The automatic decompressiom system lightens the recoil pull for
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4-3 CRANKSHAFT The crankshaft is forged carbon steel, and the crank W pin is induction-hardened. B TYPE The output end of the shaft has a crankshaft gear, and balancer gear for EH25-2 which are pressed into position. D TYPE Fig. 4-3 44 CONNECTING ROD AND PISTON The connecting rod is an aluminum alloy diecasting, and its large and smalI ends function as bearings. The piston is an aluminum alloy casting, and carries two compression rings and one
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4-6 CAMSHAFT The camshaft for the D-type engine is made of special cast iron and camshaft gears are casted to- B TYPE gether in one piece. Both sides of the shaft fit into the plane bearings on the crankcase and main bearing cover. The camshaft for the B-type engine is made of forged carbon steel and also functions as PTO shaft. The cam gear is press fitted on the shaft and the ball bearings are employed on both sides for supporting the sh
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4-9 GOVERNOR SYSTEM The governor is a centrifugal flyweight type which ensures constant operation at the selected speed against load variations. The governor gear with governor weights is installed on the main bearing cover. 4-10 COOLING SYSTEM The large fins on the flywheel provide sufficient cooling air capacity for the inlet and exhaust area / GOVERNOR GEAR and cylinder. The cylinder baffle helps the cooling air flow effi- Fig. 4-9 c
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4-13 CARBURETOR The engines are equipped with a horizontal draft carburetor that has a float controlled fuel system and a fixed main jet. The carburetors are calibrated carefully for easy starting, good acceleration, low fuel consumption and sufficient output. 4-14 AIR CLEANER The air cleaner is a single urethane foam element system. As an option, heavy duty type with a double element type is available. CLEANER COVER CLEANER CASE Single ele
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4-16 DECOMPRESSION SYSTEM An automatic decompression mechanism which AUTOMATIC DECOMPRESSOR SYSTEM opens exhaust valve before the piston reaches com- pression top is assembled on the camshaft for easy starting. Fig. 4-14 - 13-
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4-1 7 SECTIONAL VIEW OF ENGINE FUEL TANK FLYWHEEL MAIN BEARING COVER - 14-
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a ROCKER ARM PUSH ROD - 15 -
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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 reassembed correctly. If yor are uncertain of identifying some parts, it is suggested that tags be attached to them. 2) Have boxes ready to keep disassembed parts by group. 3) To prevent losing and misplacing, temporarily assemble each group of disassembed parts. 4) Carefully handle disassembed
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5-3 DISASSEMBLY PROCEDURES Tool Part to remove Procedures Remarks Step I 1 Be careful not to lose the 14mm box wrench Oil drain (1) Remove oil drain plug and drain oil. (2) To discharge oil quickly, remove oil gasket. gauge. GASKET I DRAIN PLUG Fig. 5-2 - 17 -
