TM 9-2320-260-34-1
11-5. AIR COMPRESSOR REPAIR (Contd)
19. Install new compression ring (2) in compression ring groove (3). Insert 0.009 in, (0.23 mm) feeler
gage between compression ring (2) and groove (1). Replace if compression ring(2) can be pressed
below piston surface with feeler gage in place.
20. Seat new compression ring (5) in unworn crankcase (6) portion of cylinder bore (4). Insert feeler gage
in ring end gap. Gap should be between 0.010-0.020 in. (0.25-0.51 mm), Use different sized rings
if necessary.
NOTE
The maximum crankcase bore is 3.6285 in. (92.16 mm). The
maximum out-of-round specification is 0.0014 in. (0.036 mm).
21. Inspect cylinder bore (4) for scoring, Burnish bore (4), as required, to remove scoring,
22. Using dial bore gage, measure cylinder bore (4) for out-of-roundness. If out-of-round measurement
is not within specifications, hone bore to receive 0.010, 0.020, or 0.030 in. (0.25, 0.51, or 0.76 mm)
oversize piston and rings.
23. Measure inside diameter of crankcase bushing (7). Replace crankcase bushing (7) if measurement
exceeds 1.878 in. (47.7 mm).
11-20
