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TM 9-4110-257-14
5-38. COMPRESSOR B1 TESTING, SERVICE, REPAIR. AND REPLACEMENT. - Continued
NOTE
Valve plate, suction valves, position springs, and dowel pins may come off when removing cylinder head.
(d) Remove eight screws (7), cylinder head (8), and cylinder head gasket (9). Discard cylinder head gasket.
(e) Remove four screws (10), lock washers (11), two discharge valve stops (12), and discharge valves (13).
Discard lock washers, discharge valve stops, and discharge valves.
(f)
Install two screws (10), without lock washers (11), into the outermost discharge valves (13) mounting
holes to act as jackscrews to release valve plate (14).
(g) Remove valve plate (14), valve plate gasket (15) two suction valves (16), position springs (17), and four
dowel pins (18). Discard valve plate, valve plate gasket, suction valves, and position springs.
(h) Remove any gasket material from all machined gasket surfaces and install four dowel pins (18), two new
position springs (17) contacting on the ends and bowed out in the middle, new suction valves (16), new
valve plate gasket (15), and new valve plate (14).
(I)
Check that suction valves (16) do not bind on valve plate gasket (15) by gently pushing on suction valve
through intake hole in valve plate (14). Adjust valve plate gasket as necessary to prevent suction valve
binding.
(j)
Install two new discharge valves (13), new discharge valve stops (12), four new lock washers (11), new
screws (10), new cylinder head gasket (9), cylinder head (8), and eight screws (7). Torque screws to
between 40 and 55 ft-lb (54 and 75 Nm).
(k) Replace dehydrator (para 5-14). Leak check (para 5-10), evacuate (para 5-11), and charge (para 5-12)
the refrigeration system.
(2) Sight Glass.
(a) Discharge the refrigeration system (para 5-7).
(b) Remove sight glass (20) and gasket (24). Discard gasket.
(c) Remove any gasket material from all machined gasket surfaces. Install new gasket (24) and sight glass
(20). Torque sight glass to between 35 and 50 ft-lb (48 and 68 Nm).
(d) Replace dehydrator (para 5-14). Leak check (para 5-10), evacuate (para 5-11), and charge (para 5-12)
the refrigeration system.
(3) Oil Pump.
(a) Discharge the refrigeration system (para 5-7).
(b) Loosen flare nut (25) and carefully pull tube (26) away being careful not to bend or kink tube.
(c) Remove adapter (27).
5-80
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