Cylinder Head Lower Face Warpage; Exhaust Manifold Fitting Face Warpage; Cylinder Head Height (Reference); Inspection And Repair - Isuzu A-4JA1 Workshop Manual

ENGINE ASSEMBLY ( 2 )
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is
discovered during inspection.
H
A
E
C
B
48

INSPECTION AND REPAIR

F
D
CYLINDER HEAD

Cylinder Head Lower Face Warpage

1. Use a straight edge and a feeler gauge to measure
the four sides and the two diagonals of the cylinder
head lower face.
2. Regrind the cylinder head lower face if the mea-
sured values are greater than the specified limit but
less than the maximum grinding allowance.
If the measured values exceed the maximum grind-
ing allowance, the cylinder head must be replaced.
Cylinder Head Lower Face Warpage
Standard
0.05
(0.002) or less

Cylinder Head Height (Reference)

Standard
91.95 (3.620) – 92.05 (3.624)
Note:
If the cylinder head lower face is reground, valve
depression must be checked.

Exhaust Manifold Fitting Face Warpage

Use a straight edge and a feeler gauge to measure the
manifold cylinder head fitting face warpage.
Regrind the manifold cylinder head fitting faces if the
measured values are greater than the specified limit but
less than the maximum grinding allowance.
If the measured values exceed the maximum grinding
allowance, the cylinder head must be replaced.
Maximum Grinding
Limit
Allwance
0.2 (0.008) 0.3 (0.012)
Limit
91.65 (3.60)
mm(in)
mm(in)