Gas Leakage Noise; Continuous Noise - Isuzu A-4JA1 Workshop Manual

TROUBLESHOOTING
Checkpoint
Continued from the previous page
OK
Exhaust manifold
OK
Cylinder head gasket
Fan belt
OK
Cooling fan
OK
Water pump bearing
OK
Alternator or vacuum pump
OK
Valve clearance
198
10. ABNORMAL ENGINE NOISE
2.

Gas Leakage Noise

Trouble Cause
NG Loosely connected exhaust mani-
fold and/or glow plugs
NG
Damaged cylinder head gasket
3.

Continuous Noise

NG
Loose fan belt
NG
Loose cooling fan
Worn or damaged water pump
NG
bearing
NG Defective alternator or vacuum
pump
NG Valve clearance improperly
adjusted
Countermeasure
NG Tighten the exhaust manifold
connections
NG
Replace the cylinder head gasket
NG
Readjust the fan belt tension
NG
Retighten the cooling fan
NG
Replace the water pump bearing
NG Repair or replace the alternator
or the vacuum pump
NG
Adjust the valve clearance