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 TM 55-1905-223-24-1
FIGURE 4-69. Connecting Rod Inspection.
CAUTION
Do not use the bead blast method to clean the piston. The piston will be damaged.
NOTE
Premium pistons have an anodized surface that is gray in appearance. Do not remove this
surface when cleaning piston.
(2) Clean the outer layer of carbon from the piston with steam.
NOTE
Do not use a solvent that is higher than 9.5 pH. Do not use a solvent that contains chlorinated
hydrocarbons with cresols, phenols or cresylic compounds.
For best results, soak the piston for several hours or overnight. Use a solvent that can be heated
180 to 200 (90 to 95 ) and a cleaning tank that will constantly mix and filter the solution.
F
F
C
C
(3) Soak pistons in a kerosene emulsion based solvent for a minimum of 30 minutes.
CAUTION
Do not use a metal bristle brush to clean ring grooves. Exercise care if using a used piston ring
to clean the grooves. Damage to the piston grooves can result in failure to piston and ring.
(4) Use a brush or the gap end of a used piston ring to clean the grooves on the piston.
4-73
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