Defective pressure relief valve assembly

Defective pressure gauge

Loose battery clamp

Clogged air cleaner

Worn out crank and cam shaft bearing

Defective injector

Weak compression

Defective battery

Piston ring wornout

Defective oil relief valve

Loose fan belt

Defective alternator

Defective pressure gauge

Improper valve timing

Excessive valve guide clearance

Clogged fuel filter

Defective pressure relief valve

Fuel filter clogged

Improper valve timing

Worn out liner