Isuzu A-4BG1 Workshop Manual page 190

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II II I I I I I II II II II II I I I I I I I I
12-22
TROUBLESHOOTING
ABNORMAL ENGINE NOISE
2. Gas Leakage Noise
Checkpoint Trouble Cause
Remedy
Continued from the previous page
OK
. 3
.
Exhaust manifold
NG Loosely connected exhaust mani- NG
Tighten the exhaust manifold
fold and/or glow plugs connections
.
,
I
4
I
OK 1
.
Cylinder head gasket
NG
1 Damaged cylinder head gasket 1
NG
I Replace the cylinder head gasket
3. Continuous Noise
fan belt
OK
1
NG
Loose fan belt
NG -
1 Readjust the fan belt tension
_ ., ," ' n 1 NG j
.
: NG
l
Retightenthecoolingfan ' Loose cooling fan
c
.
I
Water pump bearing
I
.
NG Worn or damaged water pump NG
bearing
Replace the water pump bearing
Alternator or vacuum pump
NG i( Defective alternator or vacuum NG Repair or replace the alternator
Pump
or the vacuum pump
h
I
OK 1
1 7 r-
Valve clearance
NG Valve clearance improperly
adjusted
NG
Adjust the valve clearance