Isuzu A-4BG1T - Page 191

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
TROUBLESHOOTING -12-23
ABNORMAL ENGINE NOISE
4. Slapping Noise
Trouble Cause
Remedy
Valve clearance
OK
Valve clearance improperly
adjusted
NG
Adjust the valve clearance
I
t
7
1
Rocker arm
NG
Damaged rocker arm
NG
Replace the rocker arm
b
4 L
c
4
OK
I
Flywheel
NC
Loose flywheel bolts
NG
Retighten the flywheel bolts
. -
L
c
I
OK 1
Crankshaft and thrust bearings
NG
Worn or damaged crankshaft
NG Replace the crankshaft and/or
v
and/or thrust bearings
-
the thrust bearings
t
I
OK
1
4
Crankshaft and connecting rod
NG Worn or damaged crankshaft
NG
Replace the crankshaft and/or
.
and/or connecting rod bearings
the connecting rod bearings
1 ,
I
I
d
m
OK 1
1
1
Connecting rod bushing and
piston pin
NG Worn or damaged connecting rod
NG Replace the connecting rod
bushing and piston pin
bushing and/or the piston pin
OK
r
Piston and cylinder liner
NG
Worn or damaged piston and
NG
Replace the piston and the cylin-
,
cylinder liner
Foreign material in the cylinder
der liner
.
J I
1