Slapping Noise - Isuzu NHR 4J Series Workshop Manual

4. SLAPPING NOISE

Checkpoint
Valve clearance
Rocker arm
Flywheel
Crankshaft and thrust
bearings
Crankshaft and
connecting rod
bearings
Connecting rod
bushing and piston pin
Piston and cylinder
liner
Possible cause
Valve clearance improperly adjusted
Damaged rocker arm
Loose flywheel bolts
Worn or damaged crankshaft and/or thrust
bearings
Worn or damaged crankshaft and/or
connecting rod bearings
Worn or damaged connecting rod bushing
and piston pin
Worn or damaged piston and cylinder liner.
SERVICE INFORMATION 00 – 13
Correction
Adjust the valve clearance
Replace the rocker arm
Retighten the flywheel bolts
Replace the crankshaft and/or the
thrust bearings
Replace the crankshaft and/or the
connecting rod bearings
Replace the connecting rod bushing
and/or the piston pin
Replace the piston and the cylinder
liner.