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ROBIN AMERICA, INC. ROBIN TO WISCONSIN ROBIN ENGINE MODEL CROSS REFERENCE LIST ROBIN WISCONSIN ROBIN EY08 W 1-080 EYl5 W1-145 EY 15V W1-145V EY20 Wl-185 EY20V WP-185V EY23 Wl-230 EY28 W 1-280 EY35 W 1-340 EY40 Wl-390 EY45V W1-45OV EY2 1 EY2 1 W EY44 EY44W EY 1 8-3 EY 18-3W EY25 EY25W EY27 EY27W v EHl 1 WOl-115 EH12 wo1-120 EHl5 WO1-150 EH17 WOI-I 70 EH2 1 wo1-210 EH25 WO1-250 EH30 WO1-300 EH30V WO1-3OOV EH34 WO 1-340 EH34V WO 1 -340V EH43V WO1-430V T
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CONTENTS See ti0 n Ti rle Page SPECIFICATIONS ............................................. 1 1 . PERFORMANCE .............................................. 3 2 . 2-1 Maximum Output ......................................... 3 2-2 Continuous Rated Output ................................... 3 2-3 Maximum Torque and Fuel Consumption Ratio at Maximum Output ....... 3 3 . FEATURES ................................................. 5 GENERAL DESCRIPTION of ENGINE CONSTRUCTION ..............
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2. PERFORMANCE 2-1 MAXIMUM OUTPUT The maximum ouput of an engine is such standard power as developed by the engine, after its initial break in period with all - the moving parts properly worn in, when operating with a fully open injection pump. Therefore, a new engine may not develop the maximum output in the beginning because the moving parts are not in a properly worn-in condition. 2-2 CONTINUOUS RATED OUTPUT The continuous rated output of an engine is such
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10 - PERFORMANCE CURVE I DY35DtB MODEL MAX. TORQUE ,,,, 9- 8- 7- rv 6- 5- 4- 3- PERFORMANCE CURVE - MODEL DY41 D, B HP g/H P- h
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LIGWWEIGWTand COMPACT 1. Lightweight because of aluminum alloy being used for various parts including the crankcase made of aluminum die casting 2. Compact in outside dimensions because- a) the camshaft is assembled inside of the gear case cover, and accordingly total width of the engine is reduced, b) the cooling fan and the flywheel are single piece die casting; and the cooling fan is set on the side of the case so that it may breathe in cooling air fr
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4-2 CRANKSHAFT The crankshaft is made of a forged chrome and molybdic steel piece with the crank pins and the journals ground to high precision after induction hardening. It is fitted to the flywheel on the fan side, and connection of the drive shaft to it is also possible. In the center of the pins and the jour- nals, holes for forced lubrication are drilled through. (See Fig. 2.) Fig. 2 4-3 CONNECTING ROD and PISTON 4-3-1 CONNECTING ROD The connect
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4-5 GEARCASE COVER Gearcase cover is made of aluminum alloy die casting and is fitted on the reverse side of the flywheel. This cover em- braces the injection pump, timing gear, operating lever and supports the camshaft as a bearing. To the gear case cover the tappet guide is fitted and then the tappets are assembled, (See Fig. 5 .) Fig. 5 4-6 CAMSHAFT The camshaft is made of forged chrome steel wholly sintered and then ground. It carries three cams, viz.
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4-9 ROCKER COWER Rocker cover is made of aluminum ailoy die casting and it is fitted to the cylinderhead and covers the rocker chamber. Rocker cover has a breather; and the air breathed is brought to the intake port. (See Fig. 7.) Fig. 7 . .- ! 4-10 GOVERNOR SYSTEM The governor is a centrifugal flyweight type and is installed ’ on the governor gear. Through the lever it adjusts the rack : of fuel injection pump and keeps constant operation at the 1 se
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CYLINDER BAFFLE 4-12 COOLING SYSTEM The cooling fan and the flywheel are a single piece casting is fitted to the top end of the crankshaft. Cooling air and it produced by this fan blows through blower housing and cyl- inder baffle, and cools cylinder and cylinderhead. (See Fig. lo.) Fig. 70 4-13 INJECTION PUMP The plunger of the fuel injection pump is operated by the injection pump cam, and the fuel from the tank is pressur- ized in the pump and suppl
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4-15 COMBUSTION SYSTEM /INTAKE VALVE For lower fuel consumption and easy starting of the engine, the direct injection system is adopted in the combusition INTAKE PORT chamber. 4-15-1 FORMING of COMBUSTION GAS and COMBUS- SWIRL TION CYLINDER SWIRL (Inspiring swirl) In order to promote mixing injected fuel and air under PISTON the direct injection system, swirl flow is utilized for good Combustion. Swirl is spiral flow of air generated in the cylinder dur
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4-16 SECTIONAL VIEW of ENGINE - 11 -
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ROCKER COVER INTAKE VALVE EXHAUST VALVE CYLINDER HEAD-\ \\ AIR CLEANER CY L BA OIL PAN-’ - 12 -
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5. DISASSEMBLY and REASSEMBLY 5-1 PREPARATIONS and SUGGESTIONS 1) When disassembling the engine, remember well the locations of individual parts so that they can be reassembled cor- ,- rectly. If you are uncertain of identifying some parts, it is suggested that tags should be attached to them. 2) Have boxes ready to keep disassembled parts by group. 3) To prevent missing and misplacing, temporarily assemble as much as possible each group or set of disassembled small parts
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5-3 DISASSEMBLING SEQUENCE *Length of the bolt indicates the length from the bolt head bottom surface to the threaded end. * * SW + Spring water * **W + Plain washer Se- Item Procedures Remarks Bolts, nuts etc. used quence ~~~~~~~ ~ ~~~ ~ ~ ~~~ ~ - ~~~ ~ ~~ 1 Engine oil Remove the oil drain plug and Be sure not to miss the 6 mrn hex. bolt . . . 2 pcs. discharge oil. Oil drain plug “0” ring. The drain plug SW . . . 2 pcs. locates under the gear case cover. serves as
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- Se- Procedures Bolts, nuts etc. used Remarks Item quence 8 Fly wheel Remove the flywheel cover. Remove the driving shaft. Raise up lock washer, loosen Crankshaft, normal lock nut (41 mm box spanner) threading and then remove the flywheel (See Fig. 18.) from the crankshaft using the flywheel puller. 9 Blower housing Remove the blower housing Just loosen the flange 6 x 8 flange bolt . . . 2 pcs. from the crankcase. bolts. No W. 8 x 55 7T bolt.. . 2 pcs. sw . .. 2 pcs.
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Procedures Remarks I Bolts, nuts etc. used l"2L quence Remove the cylinder. are rubber "0" ring and I l5 ICylrnder copper shim. (See Fig. 20.) Remove the push rod sleeve 6 mm nut . . . 2 pcs. from the gear case cover. sw . . . 2 pcs. 17 Tappet guide Remove the tappet guide from A holder is necessary for the gear case cover. not let fall the tappet. (See Fig. 2 1 .) 18 Injection pump Remove oil filler cap. Check the position of 8 mm nut . . . 3 pcs. control rack. sw . . .
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Procedures Remarks Bolts, used 20 Camshaft Pull out the camshaft. Between camshaft and gear case there is a shim. (See Fig. 24.) 21 Piston Remove the piston from the Watch the direction of connecting rod. (Remove the the clip, also pay atten- clip and pull out the piston.) tion to the direction of the piston. ( "f mark indicates "to- ward the fan side.") (See Fig. 25.) From the crankcase remove 22 Governor and 6 x 20 7T bolt . . . 2 pcs. the governor and oil pu
