bar 670 - Troubleshooting Abnormal Engine Noise

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