TM 5-4310-379-14
5-31. Compressor Pistons, Connecting Rods, and Bearings (Cont).
(5)
Remove two nuts (6), washers (7), connecting rod bolts (8), bearing cap (9) and two bearing halves (10)
from high-pressure piston assembly (11).
(6)
Remove two nuts (12), washers (13), connecting rod bolts (14), bearing cap (15) and two bearing halves
(16) from low-pressure piston assembly (17).
(7)
Remove eight screws (18) and lockwashers (19) securing cylinder (20) to crankcase (21) and remove
cylinder from pistons (11) and (17) and crankcase (21).
(8)
Remove gasket (22) from cylinder (20).
(9)
Remove piston assemblies (11) and (17) and connecting rods (23) and (24) from crankcase (21).
b.
Repair. (figure 5-46)
(1)
Remove two snap rings (1) securing high-pressure piston pin (2).
(2)
Remove high-pressure piston pin (2) and connecting rod (3) from piston (4).
(3)
Remove three compression rings (5) and oil rings (6) from high-pressure piston (4).
(4)
Using cir-clip pliers, remove two retaining rings (7) securing low-pressure piston pin (8).
(5)
Remove low-pressure piston pin (8) and connecting rod (9) from piston (10).
(6)
Remove three compression rings with seals (11) and oil ring (12) from low-pressure piston (10).
(7)
Clean pistons and connecting rod components with TSP following procedures in Chapter 3.
(8)
Inspect pistons and connecting rods for cracks, scuff marks, ridges or other signs of wear.
NOTE
High pressure piston outside diameter is 3.246-3.249 in.(8.244-8.252 cm) and low pressure piston
outside diameter outside diameter is 5.996-5.999 in.(15.229-15.237 cm). A maximum clearance of
.005 in.(.012 cm) is allowable.
(9)
Measure outside diameter of low and high pressure piston and replace diameters not within specified
limits.
(10)
Replace any component that is worn or otherwise damaged.
(11)
Install three compression rings (11) and oil ring (12) on low-pressure piston (10).
(12)
Install connecting rod (9) and piston pin (8) and usingcir-clip pliers, secure with two retaining rings (7).
(13)
Install three compression rings (5) and oil ring (6) on high-pressure piston (4).
5-142
