31
Condition Probably cause Corrective action
Mechanical knocking
Piston cylinder noise When you hear an overlapping metallic noise This may cause an abnormal wearing of cylinder
which increases its magnitude with the revolution and lower compression which in turn will
of engine and which decreases as engine is cause a lower out-put power and excessive
warmed up, this noise is caused by piston and consumption of oil.
cylinder. To locate the place, cause a misfire in
each cylinder. Overhaul engine.
Piston pin noise This noise is heard at each highest and lowest This may cause a wear on piston pin, or piston
dead end of piston. To locate the place, cause a pin hole.
misfire in each cylinder. Renew piston and piston pin assembly.
Water pump noise This noise may be caused by worn or damaged Replace water pump with a new one.
bearings, or by the uneven surface of sliding
parts.
Others An improper adjustment of valve clearance. Adjust.
Noise of timing chain. Adjust the tension of chain.
An excessive end play on crankshaft. Disassemble engine and renew main bearing.
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