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TROUBLESHOOTING
6. THERE EXISTS ABNORMAL NOISE WHEN ENGINE RUNNING
TROUBLE
Beating sound
Metal beating sound when
abnormal combustion occurs
The other
· 26 ·
CAUSE
Piston, piston ring or cylinder is worn
Connection rod or piston pin and piston pin
hole are worn
Crankshaft main neck is worn
Piston ring is broken
Carbon deposition too much
Improper fuel brand
Engine is overheat
Improper valve clearance
Fly wheel is not connected with crankshaft
tightly
REMEDY
Replace the worn part
Replace the worn part
Replace bearing
Replace piston ring
Remove the carbon deposition
Replace fuel
Find a cause and eliminate it
Readjust valve clearance properly
Connect tightly
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