Yanmar 3TNV82A Service Manual
Also see for 3TNV82A: Operation manualService manualService manualTroubleshooting manual
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Contents
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FUEL SYSTEMTNV DI Service Manual 7-5IntroductionINTRODUCTIONThis section of the Service Manual describes theprocedures necessary to remove, install, and timethe MP fuel injection pump and its associatedsystem components. This fuel injection pump isrepresentative of the fuel injection pumps used onother TNV DI model engines.Fuel Injection PumpNote: If the MP fuel injection pump itselfrequires servicing, it must be taken to anauthorized Yanmar FIE (Fuel InjectionEquipment) repair facility.CAUTIONRemove or install the high-pressure fuelinjection lines as an assembly wheneverpossible. Disassembling thehigh-pressure fuel injection lines fromthe retainers or bending any of the fuellines will make it difficult to reinstall thefuel lines.0000047enCAUTIONAfter marking the position of the pumpdrive gear, do not rotate the enginecrankshaft. Rotating the crankshaft willcause the fuel injection pump to becomemisaligned.0000048enCAUTIONDo not loosen or remove the four boltsretaining the fuel injection pump drivegear to the fuel injection pump hub. Donot disassemble the fuel injection pumpdrive gear from the hub. Correct fuelinjection timing will be very difficult orimpossible to achieve.0000031enCAUTIONDo not rotate the crankshaft with theinjection pump removed.0000083enCAUTIONEach pressure adjusting shim removedor added changes the pressurethreshold by approximately 275 psi(1.9 MPa, 19 kgf/cm 2 ). Adding adjustingshims increases the threshold pressure.Removing adjusting shims reduces thepressure threshold.0000081enCAUTION• NEVER remove or attempt to removethe tamper-proof devices from thefull-load fuel adjusting screw or thehigh-speed throttle limit screw on thefuel injection pump and governorassembly. These adjustments havebeen made at the factory to meet allapplicable emissions regulations andthen sealed.• NEVER attempt to make anyadjustments to these sealedadjustment screws. If adjustments arerequired, they can be made only by aqualified fuel injection shop that willensure the injection pump continuesto meet all applicable emissionsregulations and then replace thetamper-proof seals.• Tampering with or removing thesedevices may void the “Yanmar LimitedWarranty.”0000146en |
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