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 TM 55-1905-220-14-7
3-171.1. PISTON - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
CLEANING
Wear protective eye goggles when using compressed air.
4. Piston
a. Clean the piston components with fuel oil
compo-
and dry them with compressed air. If fuel
nents
oil does not remove the carbon deposits, use
a chemical solvent 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.
c. Clean the inside surfaces of the piston and
he oil drain holes in the piston skirt.
Exercise care to avoid enlarging the holes
while cleaning them.
3-2884
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