Slapping Noise - Isuzu A-4JA1 Workshop Manual

Checkpoint
Valve clearance
OK
Rocker arm
OK
Flywheel
OK
Crankshaft and thrust bearings
OK
Crankshaft and connecting rod
bearings
OK
Connecting rod bushing and
piston pin
OK
Piston and cylinder liner
10. ABNORMAL ENGINE NOISE
4.

Slapping Noise

Trouble Cause
NG Valve clearance improperly
adjusted
NG
Damaged rocker arm
NG
Loose flywheel bolts
NG Worn or damaged crankshaft
and/or thrust bearings
NG Worn or damaged crankshaft
and/or connecting rod bearings
NG Worn or damaged connecting
rod bushing and piston pin
Worn or damaged piston and
NG
cylinder liner
Foreign material in the cylinder
TROUBLESHOOTING
Countermeasure
NG
Adjust the valve clearance
NG
Replace the rocker arm
NG
Retighten the flywheel bolts
NG Replace the crankshaft and/or the
thrust bearings
NG Replace the crankshaft and/or the
connecting rod bearings
NG Replace the connecting rod
bushing and/or the piston pin
NG Replace the piston and the cylin-
der liner
199