Subaru Robin Power Products EY15V, EY20V 11- 1 Starting Difficulties, 11- 1-2 Compression System

Page 42

The following three conditions mustbe satisfied for satisfactory engine start.

1.The cylinder filled with a proper fuel-air mixture.

2.An appropriate compression in the cylinder.

3.Good sparks at the correct timeto ignite the mixture.

The engine cannot be started unless these three conditions are met. There are also other factors which make engine start difficult, e.g., a heavy load on the engine when it is about to start at low speed, and a high back pressure due t o a long exhaust pipe, just o say a few.

The most commoncauses of engine troublesare given below.

11- 1 STARTING DIFFICULTIES

1 1- 1 - 1 FUEL SYSTEM

1 ) No gasoline in the fuel tank; or the fuel cock is closed.

2 ) The carburetor is not choked enough, particularly when the engineis cold.

3)Water, dust or gum in the gasoline block flow of the fuel to the carburetor.

4)Inferior grade gasoline or poor quality gasoline is not gasified enough to produce the correctfuel-air mix- ture.

5)The carburetor needle valve is held open by dirt or gum. This trouble can be detected as the fuel flows out of the carburetor when the engoneis idling. (Overflow)

This trouble may be remedied, depending on cases, by lightly tapping the float chamber with thegrip of a screwdriver or the like.

6)Ifthecarburetoroverflows, excessive fuelrunsintothecylinder when startingtheengine,makingthe fuel-air mixture too rich to burn. If this happens, remove the spark plug, and turn the starting pulley a

fewturns in orderto Iet the rich fuel-air mixtureoutofthespark pulg holeintotheatmosphere.Keep/- the carburetor choke open during this operation. Dry the spark plug well, screw it into place, and try to

st artagain.

7) When the engine is cold, pull the craburetor knob to let thegasoline flow into the carburetor.

11- 1-2 COMPRESSION SYSTEM

If starting difficultes andloss of power are not due to thefuel system or ignition system, the followings must be checked for possible lack of Compression.

1)Engine inside is completely dried upbecause of a long period of non-operation.

2)Loose or broken spark plug. This causes a hissing noise made by mixture gas running out of cylinder in compression stroke during cranking.

3)Damagedheadgasket or loose cylinderhead. A similar hissing noiseisproducedduringcompression stroke.

4)IncorrectTappetClearance

If the correct compression is not obtained even after remedying the above, disassemble the engine and check further as follows:

a)Valve stuck open due to carbon or gum on thevalve stem.

b)If thepiston rings arestuckonthepiston,removethepistonandconnectingrodfromtheengine, and clean, remedy or replace the parts.

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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 MOW to Reassemble Precaution in reassembling~Sequesnceand precautionsin reassembling 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 StarterMagneto BreakerpointadjustmentTo 6-3TIMING Adjustment MagnetoTiming Adjustment See Figs ,43 Solidstate Ignition MagnetotroubleshootingSpark Testing 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 System11-3ENGINE Stops 11- 1-3ELECTRICAL System11-2ENGINGEMIFIRES 11- 4 Engine OverheatsEngineknocks Enginebackfires through CarburetorVENT1LATION InstallationPower Transmission to Drivenmachines Exhaust GasdischargeWiring Breaker Point Ignition TypeSolid State Ignition Type Checks and Corrections Table of Correctionstandards 1.o 10*0.02 #20 220 15-3EVERY 50 Hours IO Dayschecks and Maintenance Daily Checks and MaintenanceEvery 20 Hours Checks 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
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