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 TM 55-1905-219-14-7
3-171.1. PISTON - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
5. Piston
a. If the tin-plate on the piston and the
original grooves in the piston rings
are intact, it is an indication of
very little wear.
b. Examine the piston for score marks,
cracks, damaged ring groove lands or
indications of overheating. A piston
with light score marks which can be
cleaned up may be reused. Any piston
that has been severely scored or over-
heated must be replaced. Indications
of overheating or burned spots on the
piston may be the result of an obstruc-
tion in the connecting rod oil passage.
c. Replace the piston if cracks are found
across the internal struts. Use the
magnetic particle inspection method
for locating cracks in the piston.
3-2921
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