Isuzu 4JA1 Workshop Manual page 97

2. Measure the piston diameter.
Piston Measuring Point
Piston Grade (Service Part)
4JA1T(L)
015LX021
4JA1TC
4JH1TC
Cylinder Liner and Piston Clearance
4JA1T(L)
4JA1TC
4JH1TC
NOTE:
Cylinder liner kit clearances are preset. However, the
cylinder liner installation procedure may result in
slight decreases in cylinder liner clearances. Always
measure the cylinder liner clearance after installation
to be sure that it is correct.
TAPPET AND PUSH ROD
Visually inspect the tappet contact surfaces for pitting,
cracking, and other abnormal conditions. The tappet must be
replaced if any of these conditions are present.
Refer to the illustration at the left.
1. Normal contact
2. Cracking
3. Pitting
4. Irregular contact Uneven contact
014RY00028
5. Irregular contact One-sided contact
NOTE:
The tappet surfaces are spherical. Do not attempt to
grind them with an oil stone or similar tool in an effort
to repair the tappet. If the tappet is damaged, it must
be replaced.
ENGINE MECHANICAL 6A – 75
4JA1T(L)
4JA1TC
4JH1TC
AX
CX
AX
CX
0.041-0.071 (0.0016-0.0027)
0.047-0.065 (0.0019-0.0026)
mm (in)
78 (3.07)
70 (2.76)
mm (in)
92.949 - 92.964
(3.6549 - 3.6600)
92.965 - 92.980
(3.6600 - 3.6606)
95.359 - 95.374
(3.7542 - 3.7548)
95.375 - 95.390
(3.7548 - 3.7555)
mm (in)