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 TM 5-4110-217-14
1.
Screw, cylinder head
14.
Gasket, discharge valve
27
Bearing, sleeve housing
40.
Cylinder Head, L.H.
2.
Plug, cylinder head
16.
Adapter, discharge valve
28.
Washer, thrust
41.
Plate, end
3.
Cylinder head, R H.
16.
Valve, discharge
29.
Crankshaft
42.
Screw, end plate
4.
Gasket, cylinder head
17.
Pulley
30.
Bearing, end plate
43.
Gasket, pump plate
5.
Plate Assembly, valve
18.
Key, pulley
31.
Oil Pickup Assembly
44.
Oil Pump Assembly
6.
Gasket, cylinder head
19.
Plate, stop
32.
Connecting Rod
45.
Nameplate
7
Gasket, suction adapter
20.
Washer, lock
33.
Washer, piston pin
46.
Plug, pump plate
8.
Adapter, suction valve
21.
Screw, pulley
34.
Pin, piston
47.
Drive Screw
9.
Strainer, suction
22.
Screw, pintle
35.
Piston Assembly
48.
Screw, pump plate
10.
Gasket, suction valve
23.
Screw, seal cover
36.
Gasket, sight glass
49.
Gasket, end plate
11.
Valve, suction
24.
Plate, seal cover
37.
Sight Glass, oil
50.
Plug, oil drain
12.
Screw, valve
25.
Seal Assembly
38.
Retainer, sight glass
13.
Screw, valve adapter
26.
Gasket, seal cover
39.
Ring, sight glass
Figure 6-1 - Continued.
Section II. COMPRESSOR
6-12.
General.
The Dunham-Bush Model BP44-1 compressor (fig.
(6) Oil pump (44).
(7) Seal assembly (25).
mainly of cast iron.
The aluminum pistons and
(8) Pulley.
connecting rods are driven in a reciprocating motion by
More extensive repair must be performed by a higher
an iron crankshaft. To prevent leakage around the
category of maintenance (General Support).
crankshaft, a rotary seal is used. Lubrication to the
c. Disassembly (fig. 6-1).
connecting rods and bearing is provided by a vane type
oil pump. The oil level can be observed through a sight
glass in the compressor body.
(1) Remove screw (21) and washer (20)
securing pulley (17) to compressor crankshaft (29); slide
6-13.
Compressor Repair.
off pulley (17) and key (18) with screw and washer (22)
a. Removal of compressor from engine and
and stop plate (19) attached.
compressor mounting plate.
(2) Remove seal assembly (25).
(1) Close liquid line valve (58, fig. 6-2) and
(3) Remove sixteen screws (1) securing
pump the system down.
cylinder heads (3, 40) to compressor body.
(2) Front seat the discharge service valve
(16, fig. 6-1) and the suction service valve (11, fig. 6-1).
NOTE
(3) Remove discharge and suction service
It may be necessary to tap edge of
valves (16, 11, fig. 6-1) respectively off the compressor.
cylinder heads with a soft-faced
(4) Remove drive belts (11 & 12, fig. 3-21)
hammer or wooden block
from compressor pulley (17, fig. 6-1).
(4) Remove cylinder heads (3, 40) along with
(5) Remove compressor mounting hardware
head gaskets (4); valve plates (5) and gaskets (6).
(2, 3, fig. 6-2) and slide compressor from mounting plate
(5) Remove oil pump assembly (44) with
associated parts; oil plug (46), screws(48) and pump
NOTE
plate with gasket (43) from end plate (41).
Before removing the compressor from
(6) Remove seventeen screws and washers
the engine and compressor mounting
(42) securing end plate (41) to compressor body.
plate, note the oil level in the
(7) Remove end plate (41) along with gasket
compressor sight glass. It should be
(49).
at the center of the sight-glass If not, it
(8) Rotate and gently slide out camshaft (29)
should be filled to center before re-
with associated parts from compressor body.
installation
(9) Remove two connecting rods (32) and
piston assemblies (35) from the cylinders by pulling them
b. Repair. Direct support units may repair a
down into the crankcase and out the pump end of the
compressor to the extent of replacing any of the following
compressor
defective parts (refer to figure 6-1):
d. Cleaning and Inspection.
(2) R.H. & L.H. cylinder heads (3, 40).
(1) Clean all parts with an approved cleaning
(3) Valve plates (5).
solvent and dry thoroughly.
(4) Crankshaft (29).
(5) Piston assembly (35).
Suction and discharge service valves (11, 16).
Change 3 6-5
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