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 TM 55-1905-219-14-4
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 them with compressed air. If fuel oil
compo-
does not remove the carbon deposits, use a chemical solvent that will not harm
nents
the piston pin bushings or the tin-plate on the piston.
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.
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.
3-827
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