TM 5-4310-277-14
chips or other defects. Replace if defective.
KEY to figure 6-7.
c. Assembly and Installation (Model BGR-
5M-1, and HGR5-8M-1).
(1) Use a suitable bearing cup driver to press
the bearing cup (7, fig. 6-7) and a new oil seal (8) in
the crankcase. Install the remaining bearing cup in
the unloader body in the same manner.
(2) Press the tapered bearing cones and rollers
(6, fig. 6-7) on the crankshaft (5).
(3) Install the assembled crankshaft (5) and
b. Cleaning, Inspection and Repair.
tapered bearing cone and rollers in the crankcase,
and install the connecting rod caps.
(4) Install the centrifugal unloader.
(5) Install handhole plate and new plate gas-
Dry cleaning solvent, P-D-680, used to
ket.
clean parts is potentially dangerous to
(6) Install the pipe nipple and oil drain plug in
the crankcase.
personnel and property. Avoid re-
peated and prolonged skin contact.
(7) Install flywheel.
Do not use near open flame or exces-
(8) Install compressors.
c.1. Assembly and Installation (Model
sive heat. Flash point of solvent is
100F. (38oC. ) - 138F. (59C.).
HGR5-8M-6).
(1) Reassemble the crankshaft paragraph 6-
3c, (1) and (2).
(1) Clean all parts except the bearings with
(2) Install the assembled crankshaft and ta-
cleaning solvent, Federal Specification P-D-680,
pered bearing cone and rollers in the crankcase,
and dry thoroughly.
then install assembled pistons, rod caps, cylinder
(2) Place the bearings in a wire basket, dip in
block, paragraph 6-2c, (1) through (4).
cleaning solvent, Federal Specification P-D-680,
and dry with low pressure compressed air. Do not
6-4. Frame Assembly
spin the rollers. Dip in light oil.
a. Removal.
(3) Inspect the bearings for free and even ro-
tation. Replace of defective.
(1) Remove the compressor, paragraph 4-21.
(2) Remove the engine, paragraph 4-39.
(4) Inspect the crankshaft for cracks, scores,
(3) Remove the air receiver, paragraph 4-37.
and distortion. Measure the crankshaft bearing
b. Disassembly.
journals for wear, using an outside micrometer. If
the shaft measures more than 0.0005 (. 001 cm) out-
(1) Remove the nuts (1, fig. 6-8), washers (2),
and screws (3) securing the front and rear plates;
of-round, metallize the crankshaft and turn down to
remove plates (4 and 5).
correct size. The correct size for main bearing jour-
nals is 1.376 to 1.377 inches (3.5 to 3.50 cm). The
(2) Remove the drive screws (6) and identi-
fication plate (7).
correct size for connecting rod journals is 1.623 to
1.625 inches (4.1224 to 4.1275 cm).
(3) Remove nut (8), washer (9), screw (10),
washer (11), and strap (12).
(5) Inspect the bearing cups for scores, burrs,
(4) Remove side plates (13) from base (14).
pits or burned surfaces. Replace defective bearing
cups.
(6) Inspect the crankcase for breaks, cracks,
Change 1
