c. Installation.
(1) Assemble the packing (22, fig. 51) t9 the sleeve (25), and insert these parts into the recess in the
compressor manifold discharge opening.
(2) Apply a coat of gasket cement to the gasket surfaces of the manifold (17, fig. 60) and compressor cylinder
head (13). Position the gaskets (14) around the cylinder head openings and lift the manifold up into place.
In so doing, engage the manifold discharge opening with the aftercooler inlet opening.
(3) Install the eight hex head bolts (15) and special washers (16), tightening the nuts with a torque wrench to 60
foot-pounds.
(4) Install the aftercooler to manifold studs as instructed in paragraph 117c (3).
125. Compressor Valve Assemblies
a. Removal.
(1) Open the receiver service valves and release the compressed air from the air receiver.
(2) Remove the drain cock (18, fig. 41) and disconnect the tube assemblies (15), connector (16) and tees (17)
from the valve assembly, or assemblies, to be removed.
(3) Each valve assembly (7, fig. 60) is mounted on four studs (12) in the cylinder head. From each stud,
remove a special nut (11), a spacer (10), 14 spring washers (9) and an end washer (8). Lift the valve
assembly from the cylinder head.
b. Cleaning and Inspection. Clean the valve assembly, tube assemblies and fittings with compressed air or with a
non-explosive solvent such as carbon tetrachloride. If solvent is used, dry with compressed air after cleaning. Do not
lubricate the valve assembly. Insert a pencil or punch through the elongated holes in the discharge valve seat at the
bottom of the valve. Press the valve plate at several points and note whether it snaps back into place when released. This
will indicate that the bumper springs are in good condition. If the valve is not in good condition it must be replaced with a
new valve assembly.
c. Installation.
(1) Install the valve assembly (7, fig. 60) on the four mounting studs (12) in the cylinder head.
(2) Directly across from one another, at the edge of the valve body, are two square head set screws with lock
nuts. These set screws must be adjusted so that a 3/32- inch feeler gage fits, snugly between the
136
