TM 5-4320-302-14
6-16.
PISTON ASSEMBLY (CONT)
Location/Item
Action
Remarks
8.
Piston
a.
Measure piston diameter along axis A and B. A normal or new piston diameter should be
3.9351 to 3.9358 inches (99.951 to 99.969 mm). If piston is out-of-round, replace piston.
Normal and two oversizes are available:
NORMAL AND OVERSIZED
PISTON DIAMETER
inches
PISTON DIAMETER
(millimeters)
Normal
3.9351 to 3.9358
(99.951 to 99.969)
First oversize
3.9548 to 3.9555
(100.451 to 100.469)
Second oversize
3.9744 to 3.9752
(100.951 to 100.969)
b.
If cylinder has been replaced, piston must also be replaced. Use normal or
oversized piston as described in step a., above, depending on bore of new cylinder.
If oversized bore cylinders have been used, the piston must also be oversized. Refer
to paragraph 6-15 for more detail on cylinder oversizes and replacement.
6-111