TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
Page 514 of 670
TM9-2815-202-34 6-34. PISTON AND CONNECTING ROD MAINTENANCE (TRUNK TYPE) (Cont) c. d. Cleaning WARNING ● ● (1) 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. CAUTION 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 beveled edge. (3) Clean inside surfaces of piston and oil drain holes in piston skirt. Do not enlarge holes while cleaning them. Inspection (1) Piston CAUTION 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). NOTE Overheating or burned spots on piston may indicate an obstruction in connecting rod oil passage. 6-32