TM 5-4220-211-12&P
Section VIII.
CLEANING AND INSPECTION
4-20. Clean all parts in fresh mineral spirits. Metallic parts may also be cleaned in lacquer thinner. Purifier chamber
must have a final cleaning of soap and clean water followed by a thorough rinse in clean water.
4-21. COMPRESSOR. After cleaning, inspect all parts for excessive wear and damage. Inspect all threaded parts for
thread wear and damage. Inspect all mechined surfaces for scratches, score marks, cracks or other defects that would
make the part unuseable. The following piston to cylinder wall clearances are applicable:
First Stage:
.006" (.152mm) -.007: (.178mm) nominal
0.11" (.279mm) maximum
Second Stage
.005" (.127mm) -.006" (152mm) nominal
.009" (.229mm) maximum
Third Stage
.0003" (.0076mm) nominal
Piston:
.001" (.025mm) maximum
Third Stage
.003" (.076mm) -.004" (.102mm) nominal
Crosshead:
.006" (.152mm) maximum
Piston Ring end gap as measured at the bottom of the cylinder is as follows:
First Stage:
.028" (.70mm)
Second Stage:
.014" (.35mm)
Third Stage:
No Piston Rings
4-22
ENGINE. Refer to Appendix A.
4-23
PURIFIER CHAMBER. After cleaning inspect O-rings for wear and damage
Inspect all threaded parts for wear
and damaged threads.
4-24
PRESSURE MAINTAINING VALVE. After cleaning, inspect all threaded parts for wear and damaged threads
Inspect tube fittings for damage.
SECTION IX
REASSEMBLY OF MAJOR ASSEMBLIES
4-25
COMPRESSOR. The Compressor may be reassembled as follows. Particular note should be made to the
relationship of components as they were disassembled
Apply a light film of lubricating oil to all moving parts during
assembly. When reinstalling pipes and lines, when possible, loose assemble all fittings prior to tightening. To install
crankshaft bearing, heat bearing on a hot plate to a temperature of about 250 F (121 C) and slide onto crankshaft. Allow
bearing to cool, then press bearing into housings.
a
Assemble crankshaft and crankcase end housing (9 and 5, Fig. D-4).
(1)
Install crankshaft bearing (7, Fig. D-4) onto crankshaft (9 Fig. D-4).
Lubricate
seal
with
crankcase oil.
(3)
Install crankshaft and bearing (9 and 7, Fig. D-4) into crankcase end housing (5, Fig. D-4).
(4)
Install shaft key (8, Fig. D-4) into crankshaft (9, Fig. D-4).
b.
Install connecting rods (28, 43 and 50, Fig. D-4) and connecting rod spacers (29, Fig. D-4).
(1)
Lubricate crankshaft and connecting rods (9, 28, 43 and 50, Fig. D-4).
(2) Install connecting rods onto crankshaft in the same order in which they were removed. (Third stage
first; first stage second; second stage last).
4-20
