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ROBIN AMERICA, INC. ROBIN TO W1SCONSJ.N ROBIN ENGINE MODEL CROSS REFERENCE LIST WISCONSIN ROBIN ROBIN - W1-080 EY08 W1-145 EY15 W1-145V EY 15V Wl-185 EY20 W1-185V EY20V W 1-230 EY23 w 1-280 EY28 W1-340 EY35 W 1-390 EY40 W 1 -450V EY45V EY21W EY2 I EY44 EY44W EY18-3W EY 18-3 EY25W EY25 EY27W EY27 v WO1-115 EHl1 wo1-120 EH12 WO1-150 EHl5 WOI-170 EH17 wo1-210 EH2 1 WO 1-250 EH25 WO1-300 EH30 WOI-3oov EH30V WO1-340 EH34 WO 1 -3 40V EH34V WO 1 -
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CONTENTS Section Title Page 1 .SPECIFICATIONS. ..................................................................................... 1 2.PERFORMANCE ........................................................................................ 3 2-1 Maximum Output ............................................................................... 3 2-2 Continuous Rated Output .................................................................. 3 2-3 ~~~i~~~ T~~~~~ ..............................
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1. SPECIFICATIONS EH30 Model EH30B EH30BS EH30D EH30DS I Air-Cooled. 4-Cycle. Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Type 78 X 61 mm (3.07 X 2.40 in.) Bore X Stroke 291 cc (1 7.76 cu.in.1 Piston Displacement 8.3 Compression Ratio -~ 7.0/1800 HP/rpm 7.0/3600 HP/rpm Cont i nuous output Max. 9.0/1800 HP/rpm 9.0/3600 HP/rpm 1.95/2500 kg m/rpm Max. Torque I 3-9/1250 kg m/rpm Counterclockwise As Viewd From P.T.O. Shaft Side Direction of Rotation Force
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EH34 Model EH348 EH340S EH34BS 1 EH34D ~~~~~ Type Air-Cooled, 4- Cycle, Single- Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Bore X Stroke 84 X 61 mm (3.31 X 2.40 in.) Piston Displacement 338cc (20.63 cu.in.) Compression Ratio 8.3 Cont i nwus 8.0/1800 HP/rpm 8.0/3600 HP/rpm output Max. 1 1.0/1800 HP/rpm 1 1.0/3600 HP/rpm Max. Torque 4.82/1250 kg m/rpm 2.41/2500 kg m/rpm Direction of Rotation Counterclockwise As Viewd From P.T.O. Shaft Side Cooling system F
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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 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 the
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2 - 4 PERFORMANCE CURVES OEHBOD, B Kg - m 9 8 7 6 CONTINUOUS 5 RATED OUTPUT 4 RECOMMENDABLE \ HORSEPOWER RANGE 3 2 1 0 2000 2400 2800 3200 3600 (1 800) (1 000) (1 200) (1 400) (1 600) REVLOUTION- r. p. m. -4-
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*EH34D, B Kg - m w 3 0 HP A CONTINUOUS RATED OUTPUT RECOMMENDABLE HORSEPOWER RANGE 52 B w cn 0 I 2000 2400 2800 3200 3600 (1 000) (1 200) (1 400) (1 600) (1 800) REVLOUTION- r. p. m. -5-
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3. FEATURES 1. The overhead valve design offers a compactness, light weight and ideal combustion charastristics resulting in more power from less fuel and prolonged engine life. 2. The vibration free design with the twin balancer system and lighter reciprocating parts. 3. Such parts as the large capacity muffler, dual element air cleaner, helical type balancer gear with extralong teeth and the blower housing and muffler cover made of resin laminated "DAMPI
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4- 3 CRANKSHAFT The crankshaft is forged carbon steel, and the B TYPE crank pin is induction-hardened. The output end D TYPE / of the shaft has a crankshaft gear and balancer gear that are pressed into position. (See Fig. 3.) Fig. 3 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.(See F
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4- 6 CAMSHAFT The camshaft for the D- type engine is made I B TYPE of special cast iron and camshaft gears are casted together in one piece. Both sides of the shaft fit into the plane bearings on the crankcase and main bearing cover. The camshaft for B- type engine is made of forged carbon steel and also functions as PTO shaft. Cam gear is press fitted on the shaft and ball bearings are employed on the both sides for supporting the shaft. (S
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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 in the crankcase and driven by the balancer shaft. (See Fig. 9.1 Fig. 9 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 f
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4- 12 IGNITION SYSTEM I The ignition system is a transistor controlled magneto ignition system which cosists of a flywheel and an ignition coil with a built in transistor mounted on the crankcase. This system has an ignition timing advance for easy starting. (See Fig. 11.) Fig. 11 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 calibrat
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4- 15 BALANCERS Unbalanced inertia force is balanced by the two balancers which rotate at the same speed with BALANCER 1 the crankshaft to effectively reduce vibration. (See Fig. 14.) Fig. 14 4- 16 DECOMPRESSION SYSTEM An automatic decompression mechanism which AUTOMATIC DECOMPRESSOR SYSTEM opens exhaust valve before the piston reaches compression top is assembled on the camshaft for easy starting. (See Fig. 15) Fig. I5 - 11 -
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4- 17 SECTIONAL VIEW OF ENGINE /FUEL TANK FUEL 1 FLYWHEEL ' MAIN BEARING COVER - 12 - (COOLING FAN)
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PLUG COVER ROCKER ARMS DRAIN PLUG \BALANCER SHAFT 2 - 13 -
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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 parts, and
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5- 3 DISASSEMBLY PROCEDURES Part to remove Procedures Remarks Tool Step 1 Oil drain (1) Remove oil drain plug and drain oil. Be careful not to lose 14mm box wrench (2) To discharge oil quickly, remove oil the gasket. gauge. Fig. 17 - 15 -
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Step Part to remove Procedures Remarks Tool I 2 Air cleaner (1) Remove air cleaner cover. Be careful not to lose (2) Loosen two wing bolts and remove washer and gasket for element. wing bolt. (3) Loosen screw on swivel and pull out choke knob. (4) Remove two flange nuts and a bolt Pull off breather pipe lonun box wrench and remove cleaner base. from cleaner base. M6 flange nut .-.- 2pcs. M6 X 12mm bolt and washer * lpce. M6 FLANGE NUT : 2pcs. M6 BOLT AND WASHER CLEANER COVER C
