Subaru Robin Power Products EY20V, EY15V Connecting ROD and Piston, Camshaft, 6VALVEARRANGEMENT

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4-4 CONNECTING ROD and PISTON

The connectingrod is forged of aluminumalloy,

0 which itself serves as bearings at 'both the large and small ends.

The pistonis cast of aluminum alloy, and has grooves for receiving two compression rings and one oil ring. (See Fig. 5 . )

4-5 CAMSHAFT

The camshafts are integrally built with a cam gear of special cast iron, and have intake and exhaust cams. Also the camshafts have aluminum plain bearing attached to bothends. (No ball bearing is used.)

(See Fig. 6.)

I

Top R i n g

Second Ring

Oil R i n g

C o n n e c t i n g R o d

Fig. 5

4-6VALVEARRANGEMENT

The exhaust valve is located upstream of the cooling air with the result that the exhaustvalve is intensive- ly cooled for improved engine durability. The inner sideof the valve head is reinforcedwithhardalloy fused to it foradded durability. (See Fig. 7.)

2

	Fig..6
I	Exhaust Valve -

DirecGon of Coolin'g W i n d

Fig. 7

- 5 -

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Contents Page Wisconsin Robin Side ValveContents Basic Theory ofT .I.C Model SPEC1FICATIONS Continuous Rated Output PerformanceFeatures Crankshaft CYLINDER,CRANKCASEConnecting ROD and Piston Camshaft6VALVEARRANGEMENT Cylinderhead CoolingLubrication 112CARBURETOR 111IGNITIONModel EY15V Sectional View of EngineAir Cleaner Muffler Cover Model EY20V Model EY20V Special Tools Preparations and SuggestionsApplicalbeShape Model Order 3HOW to DisassembleTool Order Exhaust valve Main bearing cover Procedures Remarks OrderProcedures ~Sequesnceand precautionsin reassembling Precaution in reassemblingMOW to Reassemble CrankshaftEY15V Eyzov Dimensions of Crankshaft PinPeriphery.I Y20 5 Mainbearing Cover Valve and Valve Guide Clearance 6INTAKE and Exhaust Valves7TAPPET Adjustment Kg-cm ’ 5-4-8CYLINDER HeadIntake Manifold 1FUEL Tank Bracket1 7 Recoil Starter 14AIRCLEANERTo 6-3TIMING Adjustment BreakerpointadjustmentMagneto MagnetoTiming Adjustment See Figs ,43 Spark Testing MagnetotroubleshootingSolidstate Ignition C. TransistorignitioncircuitGovernoradjustment Point where the governorspring is to be hookedDiscrimination accordingto the dimensions Page 1 Float System CarburetorDisassembly and Reassembly 2 Pilotsystem1 Throttle System Float System BREAK-IN Operation of Reassembledengine Features IO. Robin Solid State Ignition EngineBasic Theory of T.I.C. See Fig 11- 1-2 Compression System 11- 1 Starting Difficulties11-2ENGINGEMIFIRES 11- 1-3ELECTRICAL System11-3ENGINE Stops 11- 4 Engine OverheatsEnginebackfires through Carburetor EngineknocksPower Transmission to Drivenmachines InstallationVENT1LATION Exhaust GasdischargeWiring Breaker Point Ignition TypeSolid State Ignition Type Checks and Corrections Table of Correctionstandards 1.o 10*0.02 #20 220 Every 20 Hours Checks and Maintenance Daily Checks and Maintenance15-3EVERY 50 Hours IO Dayschecks and Maintenance Every 100 200 Hours Monthly Checks and MaintenanceEvery 500 600 Hours Semiannual Checks and Maintenance Every 1000 Hours Yearly Checks and MaintenancePREPARATiON for Longabeyance Page Page Page Page Industrial Engines