Defective oil pump

Water present in the fuel

Defective relief valve

Defective fuel feed pump

Engine over heating

High fuel consumption

Low power generation

Engine noise

High fuel consumption

Less oil consumption

Excessive oil consumption

Engine will be over heated

High oil consumption

Low fuel consumption

Lower power generatio

Engine will not start

Improper tappet clearance

High oil level

Engine overheating

Low oil viscosity