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 TM 55-1905-220-14-4
3-40.1. PISTON - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
CLEANING
WARNING
Use eye protection when using compressed air.
4. Piston
Clean the piston components with fuel oil and dry
compo-
them with compressed air. If fuel oil does not
nents
remove the carbon deposits, use a chemical solvent
that will not harm the piston pin bushings or the
tin-plate on the piston.
The upper part of the piston, including the compres-
sion ring lands and grooves, is not tin-plated and
may be wire-brushed to remove any hard carbon. How-
ever, 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.
Clean the inside surfaces of the piston and the oil
drain holes in the piston skirt. Exercise care to
avoid enlarging the holes while cleaning them.
3-813
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