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Condition Probably cause Corrective action
NOISY ENGINE
Engine knocking Overloaded engine. Use right gear in driving.
Carbon knocking Disassemble cylinder head and remove carbon.
Timing knocking. Adjust ignition timing.
Fuel knocking Use specified octane fuel.
Preignition (misusing of spark plug). Use specified spark plug/Adjust Timing
Mechanical knocking
Crankshaft bearing This strong dull noise increases when engine is This caused by worn or damaged bearings, or
accelerated. To locate the place, cause a misfire unevenly worn crankshaft. Renew bearings and
in each cylinder. If the noise stops by the misfire, adjust or change crankshaft.
this cylinder generates the noise. Check lubrication system.
Connecting rod This is a little higher-pitched noise than the Same as the case of crankshaft bearings.
bearing knocking crankshaft knocking, and also increases when
engine is accelerated. Cause a misfire in each
cylinder and if the noise diminishes almost
completely, this crankshaft bearing generates
the noise.
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