6-34. PISTON AND CONNECTING ROD MAINTENANCE (TRUNK TYPE) (Cont)
Use goggles, rubber gloves, and rubber apron when cleaning parts in
carbon-removing corn-pound. Provide adequate ventilation. Avoid
inhaling fumes and contact with skin. If compound is splashed on skin,
flush with water and wash with alcohol. Alcohol containing 2 or 3
percent camphor is preferable. If contact with eyes is made, flush eyes
with water and get medical aid immediately.
Compressed air used for cleaning purposes will not exceed 30 PSI.
Use only with effective chip guarding and personal protective
equipment (goggles/shield, gloves, etc).
Clean piston components with fuel oil and dry with compressed air. If fuel oil does not
remove carbon deposits, use carbon-removing compound which will not harm bushings or
tin plating on piston.
Do not damage tin plating on piston skirt. Upper section of piston, including
compression ring lands and grooves, is not tin-plated. Wire brush upper section only to
remove any hard carbon.
(2) Clean ring grooves with suitable tool or a piece of an old compression ring ground to a
(3) Clean inside surfaces of piston and oil drain holes in piston skirt. Do not enlarge holes while
Do not remove bushings in piston or connecting rod. These parts are not serviced.
(a) Check cylinder liner and block bore for excessive out of round, taper, or high spots
which could cause failure of piston (see Para 4-34).
Overheating or burned spots on piston may indicate an obstruction in connecting rod