Subaru Robin Power Products EY15V, EY20V manual Periphery.I

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5-4-2PISTON and PISTON RING
1) If no ring expander is available, install the rings by placing the open ring ends over the first land of the
pistonandspreading	the rings only far enough to slip them over thecorrect ring grooves.	0

Note: f a y attention not to break the rings by twisting. Install the oil ring first followed by the second ring and then top ring. Meantime, the surfaces of the second ring and the top ring with carved marks are to be faced up.

Top Ring (chrome-plated)

Second Ring (undercut)

Oil Ring (chrome-plated)

Open ends' of

Piston Ring

Fig. 23

Fig. 24

2)Reassemble the piston and connecting rod by means of the piston pin.

Note: Apply enough oil to the small top end of the connecting rod. Be sure to place clips on bothends of the piston pin.

3 ) When installing theconnecting rod into place, hold piston rings with the ring guide as shown in Fig. 25 (if no ring guide is available, keep press- ing thepiston ring with finger tipsandgently strike the top of the piston with a wooden piece orthe like to push it in), andcheck thatthe symbol @ or mark MA on the connecting rod is in the direction of the flywheel magneto.

Note: Apply enough oil tothe pistonrings, con- necting rodplain bearings and cylinder wall before reassembling.

Note: The open ends o f the pistonrings must be 90" apart from one another on the piston

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Note: The clearance between the pistonand cyl- inder must be measuredat the piston skirt thrust surface.

Piston Ring Guide

I

Fig. 25

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Contents Page Side Valve Wisconsin RobinContents Basic Theory ofT .I.C SPEC1FICATIONS ModelPerformance Continuous Rated OutputFeatures CYLINDER,CRANKCASE CrankshaftConnecting ROD and Piston Camshaft6VALVEARRANGEMENT Cylinderhead CoolingLubrication 111IGNITION 112CARBURETORSectional View of Engine Model EY15VAir Cleaner Muffler Cover Model EY20V Model EY20V Preparations and Suggestions Special ToolsApplicalbeShape Model 3HOW to Disassemble OrderTool Order Exhaust valve Main bearing cover Procedures Remarks OrderProcedures Precaution in reassembling ~Sequesnceand precautionsin reassemblingMOW to Reassemble CrankshaftDimensions of Crankshaft Pin EY15V EyzovPeriphery.I Y20 5 Mainbearing Cover 6INTAKE and Exhaust Valves Valve and Valve Guide Clearance7TAPPET Adjustment ’ 5-4-8CYLINDER Head Kg-cm1FUEL Tank Bracket Intake Manifold14AIRCLEANER 1 7 Recoil StarterBreakerpointadjustment To 6-3TIMING AdjustmentMagneto MagnetoTiming Adjustment See Figs ,43 Magnetotroubleshooting Spark TestingSolidstate Ignition C. TransistorignitioncircuitGovernoradjustment Point where the governorspring is to be hookedDiscrimination accordingto the dimensions Page Carburetor 1 Float SystemDisassembly 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 Starting Difficulties 11- 1-2 Compression System11- 1-3ELECTRICAL System 11-2ENGINGEMIFIRES11-3ENGINE Stops 11- 4 Engine OverheatsEngineknocks Enginebackfires through CarburetorInstallation Power Transmission to DrivenmachinesVENT1LATION Exhaust GasdischargeWiring Breaker Point Ignition TypeSolid State Ignition Type Checks and Corrections Table of Correctionstandards 1.o 10*0.02 #20 220 Daily Checks and Maintenance Every 20 Hours 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