TM 5-4320-302-14
6-16.
PISTON ASSEMBLY (CONT)
Location/Item
Action
Remarks
CAUTION
Small-end bush damage may result if piston pin is refinished. Do not refinish highly polished or lapped
piston pin surface.
14. Piston pin
a.
Inspect for scoring, fretting, pitting, or indications of overheating. If damaged,
replace piston pin.
b.
Measure for wear and check alinement. Measure alinement with beveled steel
straightedge. This measurement will also indicate relative wear along the piston pin.
Measure diameter of piston pin with micrometer at several points along the length of
the pin. The diameter should be 1.3777 to 1.3780 inches (34.994 to 35.0 mm). The
diameter should not be greater than 1.3780 inches (35.0 mm) under normal
conditions. However, if it is, replace piston pin and recheck piston bore
measurements. Replace piston if necessary. If piston pin is worn and any diameter
measurements are less than 1.3777 inches (34.994 mm), replace piston pin.
NOTE:
MEASURE DIAMETER AT SEVERAL
POINTS ALONG LENGTH OF PIN.
6-114
