Isuzu C240 - Tappet and Push Rod

TCM £sHoP MANUAL
QY®
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.
Normal contact
Cracking
Pitting
Uneven contact
One-sided contact
Note:
©8680
The tappet surfaces are spherical. Do not grind them
with an oil stone or similar tool in an attempt to repair
the tappet. If the tappet is damaged, it must be
replaced.
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
(0.510 - 0.511) 12.95 (0.509)
Tappet and Cylinder Body Clearance mm (in)
Standard Limit
0.03 (0.001) l 0.1 (0.004)
Push Rod Curvature
1. Lay the push rod on a surface plate.
2. Roll the push rod along the surface plate and measure
the push rod curvature with a thickness gauge.
If the measured value exceeds the specified limit,
the push rod must be replaced.
Push Rod Curvature mm (in)
Standard
0.3 (0.012)
3. Visually inspect both ends of the push rod for
excessive wear and damage. The push rod must be
replaced if these conditions are discovered during
inspection.
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