TM 9-4110-254-14
5-36. COMPRESSOR B1 TESTING, REPAIR. AND REPLACEMENT - Continued
(4)
(5)
b. Testing
(1)
Remove two screws (3) and cover (4)
(2)
to 2, 1 to 3, and 3 to 2 Continuity should be indicated If continuity was not indicated, replace compressor.
(3)
terminal 1, 2, and 3 to compressor frame ground. No continuity should be indicated. If continuity was
indicated, replace compressor.
(4)
(5)
Remove nine screws (6), cylinder head (7), cylinder head gasket (8), valve plate assembly (9), four reed
valves (10) and valve plate gasket (11) Discard gaskets
(6)
Examine reed valves (10) for warpage and any other physical damage Replace valve plate assembly (9)
if reed valves are damaged.
(7)
Examine compressor (5) cylinder walls for any scoring or excessive wear (groove at top of piston (12)
travel Replace compressor if scored or excessively worn.
(8)
Press on top of highest piston (12). When pushed down, the higher piston should have some resistance
and the lower piston should rise Repeat for other piston If either piston was loose and did not cause the
other one to rise, replace piston and any other damaged components.
(9)
If no failure was indicated, remove any gasket material from all machined gasket surfaces and install
new valve plate gasket (11), four reed valves (10), valve plate assembly (9), new cylinder head gasket
(8), cylinder head (7), and nine screws (6)
(10) Install cover (4) and two screws (3).
c.
Removal.
NOTE
Remove only items necessary to access defective component(s)
(1)
Remove two screws (3) and cover (4)
(2)
Tag wire leads (13). Remove four screws (14) and pull wire leads out through strain relief cable
bushing (15)
(3)
5-78