Isuzu A-4JB1 - Tappet and Push Rod; Tappet Outside Diameter

ENGINE ASSEMBLY ( 2 )
61
TAPPET AND PUSH ROD
Visually inspect the tappet camshaft 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 Pitting
2 Cracking
3 Normal contact
4 Irregular contact
5 Irregular 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.
123
45
Tappet Outside Diameter
Measure the tappet outside diameter with a micrometer.
If the measured value is less than the specified limit, the
tappet must be replaced.
Tappet Outside Diameter mm(in)
Standard Limit
12.97 – 12.99 (0.5106 – 0.5114) 12.95 (0.5098)