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1 8-40
1977
PONTIAC SERVICE MANUAL
.026 SHOULD *GO'
R
SHOULD 'LJusT
G O '
ENT SLEEVE
RETAINER RING
SEAL ASSEMBLY
4983
Fig. 18-48 1977 A-6 Compressor Shaft and Seal
until the seal assembly engages the flats on the shaft and is
seated in place. Disengage the tool by pressing downward and
twisting tool counterclockwise.
4. Coat the seal face of the new seal seat with clean 525
viscosity refrigerant oil. Mount the seal seat on Seal Seat
Remover-Installer J 23128 and install it in the compressor
neck, taking care not to dislodge the seal seat O-ring nand
being sure the seal seat makes a good seal with the O-ring.
Remove Seal Protector J 22974 from the end of the shaft (see
Fig. 1B-46).
5. Install the new seal seat retainer ring with its flat
side against the seal seat, using Snap-Ring Pliers J 5403
(#21). See Fig. 1B-45. Use the sleeve from Seal Seat
Remover-Installer J 23 128 (Fig. 1B-46) to press in on the seal
seat retainer ring so that it snaps into its groove.
6. Install Compressor Leak Test Fixture J 9625 on rear
head of compressor and connect gage charging lines as shown
for bench test in Fig. 1B-49 or pressurize SUCTION SIDE
of compressor on car with Refrigerant-12 vapor to equalize
pressure to the drum pressure. Temporarily install the shaft
nut and, with compressor in horizontal position and oil sump
down, rotate the compressor shaft in normal direction of
rotation several times by hand. Leak test the seal with
Electronic Leak Detector J 23400. Correct any leak found.
Remove and discard the shaft nut.
7. Remove any excess oil, resulting from installing the
new seal parts, from the shaft and inside the compressor neck.
8. Install the new absorbent sleeve by rolling the material
into a cylinder, overlapping the ends, and then slipping the
sleeve into the compressor neck with the overlap towards the
top of the compressor. With a small screwdriver or similar
instrument, carefully spread the sleeve until the ends of the
sleeve butt at the top vertical centerline.
9. Position the new metal sleeve retainer so that its flange
face will be against the front end of the sleeve. Pulley Puller
Pilot J 9395 (see Fig. 1B-37) may be used to install the
retainer. Press and tap with a mallet, setting the retainer and
sleeve into place (retainer should be recessed approximately
I
504 1
Fig. 18-49 Leak Testing 1977 A-6 Compressor
1/32" front the face of the compressor neck). (See Fig. 1B-
48).
10. Reinstall the clutch plate and hub assembly as
described in "Compressor Clutch Plate and Hub Asm."
Replacement procedure.
Some compressor shaft seal leaks may be the
result of mispositioning of the axial plate on the
compressor shaft. The mispositioning of the axial plate
may be caused by improper procedures used during pulley
and driven plate removal, pounding, collisions or dropping
the compressor. If the axial plate is mispositioned, the carbon
face of the shaft seal assembly may not contact the seal seat
and the rear thrust races and bearing may be damaged.
If there appears to be too much or insufficient air gap
between the drive and driven plates, dislocation of the shaft
should be suspected. If the carbon seal is not seating against
the seal seat, it will not be possible to completely "Evacuate
the System" as outlined under DISCHARGING, ADDING
OIL, EVACUATING AND CHARGING PROCEDURES
FOR C.C.O.T. A/C SYSTEMS.
To check for proper positioning of the axial plate on the
shaft, remove the clutch driven plate and measure the
distance between the front head extension and the flat
shoulder on the shaft as shown in Fig. 1B-48. To measure this
distance, use a wire gage
(
the clearance should be
between .026" and .075"
).
If the shaft has been pushed
back in the axial plate (measurement greater than .075"),
disassemble the compressor and replace the shaft and axial
plate assembly rear thrust races and thrust bearing.
11. "Add Oil, Evacuate and Charte System" (see
DISCHARGING, ADDING OIL, EVACUATING AND
CHARGING
PROCEDURES
FOR
C.C.O.T. A/C
SYSTEMS).
A-6 COMPRESSOR PRESSURE RELIEF
VALVE
When necessary to replace the pressure relief valve,
located in the compressor rear head casting (Fig. 1B-50), the
valve assembly should be removed after PURGING THE
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