TM 5-4310-227-15
b. Cleaning, Inspection, and Repair.
(5) Install the centrifugal unloader (para
(1) Clean all parts except the bearings
with an approved cleaning solvent and
dry thoroughly.
4 - 4 0 . Crankcase
(2) Place the bearings in a wire basket,
a. Removal.
dip in an approved cleaning solvent
(1) R e m o v e the compressor assembly
and dry with low-pressure compressed
air. Do not spin the rollers. Dip in
(2) Remove the access cover plates and oil
light oil.
sight indicator (para 3-77).
(3) Inspect the bearings for free and even
(3) Remove the cylinder, pistons, and con-
rotation. Replace if defective.
necting rods (para 4-38)
(4) I n s p e c t the crankshaft for cracks,
(4) Remove the crankshaft, bearings, and
scores, and distortion. Measure the
oil seal (para 4-39).
crankshaft bearing journals for wear,
(5) Remove the six studs (10, fig. 3-29)
using an outside micrometer. If the
from the top of the crankcase (21).
shaft measures more than 0.0005 out-
(6) Remove the pipe plug from the crank-
of-round, metalize the crankshaft and
case.
turn down to correct size. The correct
b. Cleaning, Inspection, and Repair.
size for main bearing journals is 1.376
(1) Clean the crankcase with live steam
to 1.377 inches. The correct size for
or an approved cleaning solvent and
connecting rod journals is 1.375 to
dry thoroughly.
1.876 inches
(2) Inspect the studs and stud holes for
(5) Inspect the bearing cups for scores,
damaged threads.
burrs, pits, or burned surfaces. Re-
(3) Rechase damaged threads. Replace a
place defective bearing cups.
damaged stud.
c. Reassembly and Installation.
(4) I n s p e c t the crankcase for cracks,
(1) Use a-suitable bearing cup driver to
breaks, or other damage. Replace a
press the bearing cup (15, fig. 4-14)
damaged crankcase.
and a new oil seal (16) tn the crank-
case (21, fig. 3-29). Install the re-
c. Installation.
maining bearing cup in the unloader
(1) Install the pipe plug in the crankcase.
body (16) in the same manner.
(2) Install the six studs in the top of the
(2) Install the pipe plug in the rear of the
crankcase.
(3) Install the crankshaft, bearings, and
crankcase.
(3) Press the tapered bearing cones and
oil seal (para 4-39).
rollers (14, fig. 4-14) on the crank-
(4) Install the cylinder, pistons, and con-
shaft (13).
necting rods (pars 4-38).
(4) Install the assembled crankshaft and
(5) Install the access cover plates and oil
tapered beating cone and rollers in the
sight indicator (para 3-77).
crankcase, and install the connecting
(6) I n s t a l l the compressor assembly
rod caps (para 4-38).
