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 TM 55-1905-221-14-3
6-27.1.
PISTON - MAINTENANCE INSTRUCTION ( Continued)
LOCATION/ITEM
ACTION
REMARKS
CLEANING
4. Piston
Component
Dry cleaning solvent, P-D-680, used to clean parts, is potentially dangerous to personnel
and property. Avoid repeated or prolonged skin contact. Do not use near open flame or excessive
heat. Flash point of solvent is 100- 138 (38- 59 ).
F
C
Wear protective eye goggles when using compressed air.
a. Clean the piston compo-
nents with fuel oil and
dry them with compressed
air. If fuel oil does
not remove the carbon
deposits, use a chemical
solvent P-D-680 that
will not harm the piston
pin bushings or the
tin-plate on the
piston.
b. The upper part of the
piston, including the
compression ring
lands and grooves, is
not tin-plated and may
be wire-brushed to
remove any hard carbon.
However, use care to
avoid damage to the
tin-plating on the
piston skirt. Clean the
ring grooves with a
suitable tool or a piece
of an old compression
ring that has been
ground to a bevel
edge.
6-425
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