Replacing Piston, Piston Rings, Piston Pin and Connecting Rod
Compressor must be removed from unit. Follow compressor removal instructions.
Drain oil from compressor crankcase.
Connecting rods are accessible from the bottom of the compressor. Remove the compressor bottom
plate by removing 16 bottom plate capscrews.
Remove connecting rod cap boltsand connecting rod caps. By rotating compressor crankshaft,
connecting rods may be cleared from their bearings and connecting rod and piston may be removed
from cylinder bore as a unit.
Remove piston from crankshaft before removing piston pin lock ring and piston pin.
Check for wear on these wear surfaces listed below. The allowable wear on these surfaces is as
Piston Pin Bushing
Rod at Crankshaft
Remove old piston compression and oil rings by expanding ring at ring gap and carefully removing
over top of piston.