Rocker Arm Correction; Cylinder Body; Cylinder Body Upper Face Warpage - Isuzu A-4JA1 Workshop Manual

1
1
2
A
E
C
B
2
F
D
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.

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".
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.
Cylinder Body Upper Face Warpage
Standard
0.05 (0.002) or less
If the measured value is more than the limit, the
cylinder body must be replaced.
ENGINE ASSEMBLY ( 2 )
mm(in)
Limit
0.2 (0.008)
55