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TM 5-4320-306-24
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 (38° to 59°C).
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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