Yanmar 4JH45 Operation Manual

Also see for 4JH110: Operation manual Operation manual Operation manual

Contents

Yanmar 4JH45 Operation Manual Manual pdf 113 page image

TROUBLESHOOTINGJH Series Operation Manual 10512/05TROUBLESHOOTING CHARTSymptom Probable Cause MeasureIndicators light on theinstrument panel and alarmsounds during operationShift to low speed operation immediately, and check which indicator has come on. Stop theengine and inspect. If no abnormality is identified and there is no problem with operation, returnto port at lowest speed and request repairs.Engine does not start or starts with difficultyPinion gear does not engage Loose terminal of battery/engagemagnetTightenPoor contact of starting switch Correct with sandpaper or replaceOpen coil of magnet switch ReplaceBurr at gear tooth tip CorrectPoor clearance between pinion andring gearCorrectPinion gear is engaged withring gear, but does not rotateLoose battery/starter terminal TightenPoor contact of starting switch Correct with sandpaper or replaceWorn brush ReplaceOpen circuit of starter coil ReplaceSlippage of starter/clutch ReplaceExcessive resistance of cablebetween battery and starterIncrease the cable size or shortenInsufficient battery charge ChargeNo fuel injection Incomplete priming of fuel system Carry out sufficient primingClogged fuel inlet filter ReplaceFuel level in fuel tank is low Add fuelClosed cock of fuel tank Open cockClogged fuel pipe CleanFailure of fuel supply pump Repair or replaceFailure of fuel injector Faulty valve seat ReplaceSticking of nozzle ReplaceWorn nozzle ReplaceClogged injection hole ReplaceFailure in fuel injection system Loose fuel injection pipe joint TightenBroken fuel injection pipe ReplaceAir trapped in fuel injection pipe Bleed air from pipeEngine compressed air leak Air leak from exhaust valve Carry out fitting of valve and seatFaulty gasket/packing ReplaceWorn upper portion of cylinder ReplaceWorn piston ring ReplaceSticking piston ring Overhaul or replaceBroken valve spring ReplaceNo revolution indication onTachometer duringcranking.Poor connection of crank & camposition sensors.Check connection of the wire harnessOther Failure of engine system Conduct servicingClogged intake or exhaust pipe CleanController defects system error Check DTC and conduct servicing