Isuzu 4JA1 Workshop Manual page 96

6A – 74 ENGINE MECHANICAL
Piston Grade Selection
Measure the cylinder liner bore after installing the cylinder liner.
Then select the appropriate piston grade for the installed
cylinder liner.
1. Measure the cylinder liner bore.
Refer to "Cylinder Liner Bore Measurement"
Cylinder Liner Bore (Service Part) Grade
4JA1T(L)
4JA1TC
4JH1TC
NOTE:
It is most important that the correct piston grade be
used. Failure to select the correct piston grade will
result in engine failure. Always measure the cylinder
bore and select the correct piston grade.
Grade Bore measurement
93.035-95.050
AX
(3.6628-3.6634)
93.051-95.066
CX
(3.6634-3.6640)
95.435-95.450
AX
(3.7573-3.7579)
95.451-95.466
CX
(3.7579-3.7585)
mm (in)