Second Stage Relief Valve

TM 5-4310-340-24

(1) Install elbow (11), with washer (5) through

(3) Position spacers (4, fig C-6) and bracket (7)}

hole in discharge bracket (7). Secure elbow with nut (6) and

on fourth stage head and secure with two screws (10), flat

washer (5).

washers f8), and lockwashers (9).

(2) Connect aftercooler tube to elbow and tighten

(4) Connect aftercooler tube end nut to elbow (11)

to 135-150 lb-in.

and tighten to 135-150 lb-in.

3-20. Discharge Bulkhead Elbow Bracket

3-17. Second Stage Relief Valve

a. Removal (fig C-6).

a. Removal.

(1) Remove elbow from bracket (para 3-19).

(1) Remove third stage cooler (para 3-8).

(2) Remove two screws (10), lockwasher (9), and

(2) Disconnect aftercooler tube (10, fig C-4), from

flat washers (8) securing bracket to fourth stage head.

union (5, fig C-5).

Remove bracket (7) and two spacers (4) from compressor.

(3) Disconnect second stage cooler end nut from

relief valve (8, fig C-4).

b. Installation.

(4) Unscrew relief valve from third stage head.

(1) Position two spacers (4) and bracket (7) on

b. Installation.

fourth stage head.

(2) Secure bracket to head with two flat washers

NOTE

(8), lockwashers (9), and screws (10). Tighten screws to

Apply teflon tape per MIL-T-2-7730 to relief valve

60..65 lb-in.

threads prior to installation.

(3) Install elbow (11), (para 3-19).

(1) Install relief valve into third stage cylinder

3-21. Check Valve

head inlet port and tighten. Valve must be alined with second

stage cooler tube.

a. Removal (fig C-11).

(2) Connect second stage cooler tube end nut to

(1)

Unscrew check valve (5) from tee (3).

relief valve and tighten to 135-150 lb-in.

(2)

Remove preformed packing (4) from check

(3) Connect aftercooler tube end nut to union (5.

valve.

fig A-5) and tighten to 135-150 lb-in.

b. Installation.

(4) Install third stage cooler (para 3-8).

(1) Position preformed packing (4) into packing

3-18. Fourth Stage Restrictor Fitting

groove of check valve (5).

(2) Install check valve into tee (3) and tighten to

a. Removal (fig C-5).

40-6.5 lb-in.

(1) Disconnect fourth stage relief valve tube 18)

from restrictor fitting (9).

3-22. Check Valve Tee

(2) Disconnect aftercooler (6) from restrictor

a. Removal (fig C-11).

fitting (9).

(3) Unscrew restrictor fitting (9) from fourth stage

cylinder head.

(1) Disconnect tube from tee (3).

(2) Remove check valve (para 3-21).

b. Installation.

(3) Loosen nut (39) and unscrew tee (3) from

NOTE

crankcase adapter (1).

Apply teflon tape per MIL-T-27730 to restrictor

b. Installation.

fitting threads prior to installation

(1) With preformed packing (38) back-up ring (4),

and nut (39) assembled on tee (3), install tee into crankcase

(1) Install restrictor fitting (9) into fourth stage

adapter blow-by port.

cylinder head outlet port and tighten. Fitting must be alined

(2) Connect tube to tee (3).

with aftercooler and fourth stage relief valve tube end nuts.

(3) Tighten nut (39) securely.

(2) Connect fourth stage relief valve tube (8) to

restrictor fitting (9) and tighten to 135-150 lb-in.

(3) Connect aftercooler end nut to restrictor fitting

3-23. Oil Inlet Tube

and tighten to 135-130 lb-in.

a. Removal (fig C-6). Disconnect tube (13) end nuts

3-19. Discharge Bulkhead Elbow

from union (3) and elbow (14).

Remove tube from

compressor.

a Removal fig C-6).

b. Installation. Position tube (13) on union (3) and

(1) Disconnect aftercooler tube end nut from

elbow (14). Tighten tube (13) end nuts to 135130 lb-in.

elbow (11).

(2) Remove nut (6) and washer (5).

3-24. Oil Pickup Screen

(3) Remove elbow (11) and washer (5) from

a. Removal (fig C-11).

discharge bracket.

(1) Remove oil inlet tube (para 3-23).

b. Installation.

(2) Unscrew fitting (24) from sump and remove

screen (23).

3-6