PISTONS, PISTON PINS AND RINGS MAINTENANCE - CONTINUED
CLEANING - CONTINUED
Clean pistons again in solution of laundry detergent and hot water.
Particles blown by compressed air are hazardous. DO NOT exceed 15 psi (103 kPa) nozzle pressure when
drying parts with compressed air. Use a maximum of 30 psi (207 kPa) when cleaning components. DO NOT
direct compressed air against human skin. Failure to follow this warning may cause injury or death. Make
sure air stream is directed away from user and other personnel in the area. To prevent injury, user must wear
protective goggles or face shield.
Rinse pistons in clean, fresh water and dry using compressed air.
Visually inspect ring grooves, piston top, piston skirt and piston pin bore for cracks or other damage and for excessive
Check piston skirt diameter using an inside microme-
ter at a point approximately 1/2 in. (13 mm) above
bottom edge of piston. Minimum allowable skirt
diameter is 4.0088 in. (101.8235 mm).
Check ring clearance for top, intermediate and oil con-
trol ring grooves using new rings and feeler gage (12)
as shown. Maximum allowable clearances for these
two grooves are:
Intermediate ring groove - 0.006 in. (0.152 mm).
Oil control ring groove - 0.005 in. (0.127 mm).
Check piston pin bore diameter (13) at four points noted. Maximum allowable bore diameter is 1.5758 in. (40.02 mm).
Check piston pin (2) diameter at six points as shown. Minimum allowable pin diameter is 1.5744 in. (39.98 mm).