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8. Remove the desiccant cartridge o-ring (21) from the end
cover.
CLEANING & INSPECTION
1. Using mineral spirits or an equivalent solvent, clean and
thoroughly dry all metal parts.
2. Inspect the interior and exterior of all metal parts that
will be reused for severe corrosion, pitting and cracks.
Superficial corrosion and or pitting on the exterior portion
of the upper and lower body halves is acceptable.
3. Inspect the bores of both the end cover and the purge
valve housing for deep scuffing or gouges.
4. Make certain that all purge valve housing and end cover
passages are open and free of obstructions.
5. Inspect the pipe threads in the end cover. Make certain
they are clean and free of thread sealant.
6. Inspect the purge valve housing bore and seats for
excessive wear and scuffing.
7. Inspect the purge valve piston seat for excessive wear.
8. Inspect all air line fittings for corrosion. Clean all old
thread sealant from the pipe threads.
9. All o-rings removed should be discarded and replaced
with new o-rings provided in appropriate kit(s).
Any component exhibiting a condition described in step 1
to 8 should be replaced.
ASSEMBLY
Prior to assembly, coat all o-rings, o-ring grooves, and bores
with a generous amount of barium base lubricant. Refer to
Figure 7 during assembly unless otherwise advised.
1. Purge Valve Housing Assembly
A. Install the o-ring (14) in its groove on the O.D. of the
purge piston. Place the return spring (13) in the bore
of the purge valve housing. Place the o-ring (10) into
its recess in the bore of the purge piston. Install the
1/4" Torx head bolt (31) into the l.D. of the purge
piston. Insert the purge piston (33) into the l.D. of
the spring (13). Using a Torx head wrench, push the
purge piston into the piston housing until it bottoms.
B. While depressing the purge piston with the Torx head
wrench, install the following parts over the purge valve
bolt (31) from the opposite end of the purge valve
housing; the purge valve (11) with its rubber side first,
followed by the diaphragm (2) (if present), the dia-
phragm washer (32) (if present) or the flat washer
and finally the 1/4" hex nut (4). Torque the purge
valve nut and bolt (4 & 31) to between 60-80 in. Ibs.
C. Install the three o-rings (5, 6 & 7) on the purge valve
housing placing each in its appropriate location. If
the exhaust cover (30) was removed during disas-
sembly, install it on the purge valve housing assem-
bly making certain the bubble portion is positioned
over the thermostat. Install the assembled purge valve
housing in the end cover making certain to orient
both parts such that the connector is approximately
10 degrees clockwise from the supply port, while
making certain the purge valve housing is fully seated
against the end cover. Secure the purge valve hous-
ing to the end cover using the three 1/4" self-tapping
screws (3). Start all three screws by hand then
torque to 50-80 in. Ibs.
2. Install the o-ring on the check valve assembly (15), then
install the assembly in the end cover.
3. Install the desiccant cartridge o-ring (21) in its groove in
the end cover. Using a light coat of barium grease,
lubricate the bottom of the desiccant cartridge in the
area that will contact the o-ring (21) and end cover. Screw
the desiccant cartridge into the end cover until contact
is made between it and the o-ring. Using a strap or chain
wrench positioned 2-3" from the bottom of the cartridge,
turn the desiccant cartridge clockwise 180-225 degrees
beyond the position where initial contact was made
between the cartridge and end cover o-ring. Torque should
not exceed 50 ft. Ibs.
6
4
1&9
7
FIGURE 8 - END COVER TO HOUSING TORQUE PATTERN
2
5
3
8
9