Defective pressure relief valve

Incorrect quality of fuel

Defective fuel injection pump

Low compression pressure

Wornout camshaft, crank shaft bearings

Defective injector

More crankshaft end play

Carbon deposit on piston head

High oil pressure

Low oil pressure

Low fuel pressure

High oil consumption

Low power generation

High fuel consumption

Engine does not start

High oil consumption

Engine run erratically

Low power generation

Engine will not start

Engine will be over heated