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Problem
Engine runs irregularly
Engine runs irregularly
or stalls frequently
or stalls frequently
Stops suddenly
Stops suddenly
Lack of engine power
Lack of engine power
Engine overheats
Engine overheats
* See Section 2— Fault Shutdowns
4-2 Troubleshooting
Engine (continued)
Possible Cause
Vent in fuel tank cap obstructed
Clogged fuel filter
Water, dirt, or air in fuel system
Dirty or faulty injectors
Faulty governor linkage
Defective fuel feed pump
Incorrect valve clearance
Incorrect compression
Out of fuel
Air intake restriction
Fuse blown in controller
High water temperature (HWT) shutdown*
Low oil pressure (LOP) shutdown*
Defective fuel pump
Clogged fuel filter
Engine overload
Air intake restriction
Clogged fuel filter
Incorrect valve clearance
Dirty or faulty injectors
Incorrect fuel injection timing
Incorrect engine compression
Vent in fuel tank cover obstructed
Overfueling (rich)
Engine overloaded
Defective cooling system
Loose or defective water pump v-belt
Cooling system needs flushing
Defective thermostat
Defective high water temperature (HWT) switch Replace switch
Cooling water leaks from passages
Radiator clogged with dirt or oil
Radiator cap defective
Cylinder head gasket defective
Corrective Action
Clean cap in solvent; blow dry
Replace fuel filter element
Drain, flush, fill, and bleed air in fuel system
See authorized service distributor/dealer
See authorized service distributor/dealer
Replace fuel feed pump
See authorized service distributor/dealer
See authorized service distributor/dealer
Replenish fuel supply
Service air cleaner
Replace fuse. If fuse blows again, see
authorized service distributor/dealer
Check engine coolant level, loose fan belt,
radiator obstructions, etc.
Check engine lube oil level
See authorized service distributor/dealer
Replace filter
Reduce load
Service air cleaner
Replace filter element
See authorized service distributor/dealer
See authorized service distributor/dealer
See authorized service distributor/dealer
See authorized service distributor/dealer
Clean cap in solvent; blow dry
See authorized service distributor/dealer
Reduce load
Check water pump
Adjust belt tension or replace belt
Flush cooling system
Replace thermostat
Check water passages
Clean with water soluble grease remover and
flush cooling system
Replace
See authorized service distributor/dealer
TP-5605 4/97
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