Isuzu A-4JB1 Repair Manual

ENGINE ASSEMBLY ( 2 )
3. Check that the rocker arm oil port is free of obstruc-
tions.
If necessary, use compressed air to clean the rocker
arm oil port.
55
Rocker Arm Correction
Inspect the rocker arm valve stem contact surfaces for
step wear 1 and scoring 2 .
If the contact surfaces have light step wear or scoring,
they may be honed with an oil stone.
If the step wear or scoring is severe, the rocker arm must
be replaced.
CYLINDER BODY
Cylinder Body Upper Face Warpage
1. Remove the cylinder body dowel.
2. Remove the cylinder liner.
Refer to “Cylinder Liner Replacement”.
1
2
3. Use a straight edge 1 and a feeler gauge 2 to
measure the four sides and the two diagonals of the
cylinder body upper face.
1
2
Cylinder Body Upper Face Warpage mm(in)
Standard Limit
0.05 (0.002) or less 0.2 (0.008)
If the measured value is more than the limit, the
cylinder body must be replaced.
EF
A
B
C
D

Isuzu A-4JB1 Specifications

General

Brand	Isuzu
Model	A-4JB1
Category	Engine
Language	English