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TM 5-4320-305-24
4-10. REPLACE/REPAIR PISTON ASSEMBLY (Continued)
3 Remove piston pin (2) from piston (3).
4 Remove piston rings (5, 6, and 7) from piston (3) with piston ring pliers No. 130300 (8). Discard piston
rings.
CLEANING/INSPECTION:
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard's Solvent)
is potentially dangerous. Avoid repeated and prolonged
breathing of vapors and skin contact with the liquid. Do
not use near open flame, arcing equipment, or other
ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100° to
138°F (380 to 590C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air for
cleaning or drying unless the pressure is/has been reduced
to 30 psi (2.11 kgcm2) or less. When working with
compressed air always use chip guards, eye protection, and
other personal protective equipment.
1 Clean piston, piston pin, and piston rings with dry cleaning solvent and dry with compressed air. Remove carbon from
piston ring lands (1) and grooves (2) with a wire brush. Clean inside surface of piston (3) and piston skirt (4). Clean
piston pin bore (5) with small wire brush.
NOTE
Excessively worn pistons, rings, or cylinders may
be an indication of abnormal maintenance practices
or operating conditions. Check for and correct any
abnormalities.
4-73
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