TM 5-4310-277-14
(8) Install the belt guard, as illustrated in fig-
(6) Remove the connecting rod caps (2, fig. 6-
ure 6-2.
7). The connecting rods are accessible through the
handhole plate in the bottom of the crankcase. The
(9) Install the pipe nipple and oil drain plug,
as illustrated in figure 6-1.
caps are matched with the connecting rod. Tag the
cap to identify it with appropriate rod to assist in
(10) Install the compressors.
c.1. Assembly and Installation (Model
proper reassembly.
HGR5-8M-6).
(7) Remove the crankshaft (5) from the
crankcase (9) as illustrated in figure 6-7. The bear-
(1) Reassemble the pistons and connecting
rods in reverse of the numerical sequence illus-
ings are pressed on the shaft and will come out with
trated in figure 6-6.1. Lubricate each piston and
the crankshaft.
connecting rod assembly with a light coat of engine
(8) Place the crankshaft in a suitable press
oil.
and carefully remove the two tapered bearing cones
(2) Attach assembled pistons and connecting
and rollers from the crankshaft.
rods to crankshaft and secure with connecting rod
(9) Using a blunt instrument drive the bear-
cap (5, fig. 6-6.1) and connecting rod bolt (4).
ing cup (7, fig. 6-7) and oil seal (8) out of the fly-
Tighten bolt to 25 foot-pounds (3.57 kg - m) max-
wheel side of the crankcase. Discard oil seal. Re-
imum. The connecting rod caps and connecting rods
move the bearing cup (7) from the loader housing.
are matched parts, and should not be interchanged.
b.1. Removal and Disassembly (Model
(3) Carefully install cylinder block (2) on to
HGR5-8M-6).
previously assembled piston, using a piston ring
(1) Remove the compressor, paragraph 3-51.
clamp to insert pistons into cylinders. Remove
(2) Remove oil drain plug, paragraph 3-11 and
clamp. Install new cylinder block gasket (3), then
drain oil.
secure cylinder block assembly to crankcase,
(3) Remove flywheel, paragraph 3-31.
Tighten the cylinder block screws to 45 footpounds
(4) Remove the centrifugal unloader, para-
(6.224 kg - m) torque.
graph 4-29.
(4) Proceed with compressor reassembly fol-
(5) Remove cylinder block assembly, para-
lowing steps (4) through (10) except item (5) (not
graph 6-2.
applicable to model HGR5-8M-6).
(6) Location of the connecting rod attaching
bolts (1, fig. 6-7.1) and connecting rod cap (2) is pro-
vided from above after cylinder block has been re-
moved.
(7) Remove connecting rod bolts and with-
a. Removal and Disassembly (Model BGR-
draw connecting rod caps from crankcase. The caps
5M-1 and HGR5-8M-1).
are matched with the connecting rod. Tag the cap to
(1) Remove the compressors.
identify it with appropriate rod to assist in proper
(2) Remove oil drain plug.
reassembly.
(3) Remove flywheel.
(8) Proceed with disassembly following steps
(4) Remove handhole plate and gasket.
(7) through (9) paragraph 6-3a.
(5) Remove the centrifugal unloader.
