TM 5-4310-375-14
Dry cleaning solvent, Federal Specification P-D-680, used to clean parts is
potentially dangerous to personnel and property. Avoid repeated and pro-
longed skin contact. Do not use near an open flame or excessive heat. Flash
point of the solvent is 100F - 138F (38C - 59C).
b. Cleaning. Clean all parts in solvent, P-D-680, or equivalent. Dry thoroughly. Clean any gasket material that may
have stuck to cylinder (3, fig 5-4) flange or compressor frame by carefully scraping off the material.
Inspection. Inspect component parts of this functional group in following manner.
c.
(1) Inspect cylinder (3, figure 54) bores for scratches and scoring. Inspect cooling fins and mounting flange for
cracks and breaks. Examine for cross-threading in cylinder head bolt holes. Check cylinder bores for excessive wear.
Acceptable diameter of first stage cylinder bore is 4.13 in. (105 mm) and second stage cylinder bore is 2.05 in. (75 mm).
(2) Inspect piston ring sets (5, 18) for cracked or broken rings. Replace rings in sets only. Inspect pistons (8, 21)
for broken or cracked ring lands, cracked heads or skirts.
NOTE
Piston ring sets (5, 18) and pistons (8, 21) are available in oversize spare parts.
Refer to TM 5-4310-375-24P.
(3) Inspect piston pins (7, 20) for scoring and evidence of binding in bushings (16, 29). Inspect the bushings
(16, 29) for scoring and free fit of pins.
(4) Inspect connecting rod bearings (17, 30) for scoring and excessive wear.
NOTE
Connecting rod bearings (17, 30) are available in undersize spare parts.
Refer to TM 5-4310-375-24P.
(5) Examine all parts for nicks, crack, breaks, damage to threads, and distortion.
d. Repair/Replacement. Replace damaged piston rings (5, 18, fig 5-4) in sets only. Cylinder (3) bores may be
honed to remove scratches within limits shown in table 5-2. Replace all damaged parts. Replace cylinder gasket (4) each
time cylinder (3) is removed. Replace connecting rod bearings (17, 30) when worn beyond limits shown in table 5-2.
NOTE
Piston ring sets (5, 18) and pistons (8, 21) are available in oversize spare
parts. Connecting rod bearings (17, 30) are available in undersize spare
parts. Refer to TM 5-4310-375-24P.
e . Reassemb/y/Installation. Reassemble and install as follows:
(1) If removed, press bushing (29, fig 54) into piston pin end of connecting rod (27). If removed, install oil
splash rod (28) in connecting rod cap (26).
(2) Coat bearing (30) liberally with clean compressor oil. Install connecting rod bearing (30) halves in cap (26)
and connecting rod (27). Attach connecting rod assembly (22) to crankshaft, matching rod cap (26) to
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