Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 15 / 468

AIR CONDITIONING
1B-9
L E A K TEST
AD A PTER
J-9625
O IL F IT T IN G
Fig. 22-- Leak T e s tin g A-6 C o m pre sso r
4. Coat the seal face of the new seal seat with clean 525
viscosity refrigerant oil. M ount the seal seat on Seal Seat
Rem over-Installer J-23128 and install it in the compressor
neck, taking care not to dislodge the seal seat O-ring and
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. 19).
5. Install the new seal seat retainer ring
w ith its flat
side against the seal seat
, using Snap-Ring Pliers J-
5403 (# 2 1 ) . See Fig. 18. Use the sleeve from Seal Seat
Rem over-Installer J-23128 (Fig. 19) 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. 22 or pressurize SU CTIO N
SID E of compressor on car with R efrigerant-12 vapor to
equalize pressure to the drum pressure. Tem porarily install
the shaft nut and, with com pressor in horizontal position
and oil sump down, rotate the com pressor shaft in norm al
direction of rotation several times by hand. Leak test the
seal with a Leak Detector. 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
m aterial into a cylinder, overlapping the ends, and then
slipping the sleeve into the com pressor neck with the
overlap tow ards the top of the compressor. W ith a small
screwdriver or similar instrum ent, 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. 11) may be used to install the
retainer. Press and tap with a mallet, setting the retainer and
sleeve into place (retainer should be recessed approxim ately
1/32" from the face of the com pressor neck). See Fig. 21.
10. Reinstall the clutch plate and hub assembly as
described in "Com pressor Clutch Plate and H ub 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 im proper 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.
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. 21. 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 (measurem ent greater than .075"),
disassemble the com pressor and replace the shaft and axial
plate assembly rear thrust races and thrust bearing.
11. Evacuate and charge system.
PRESSURE RELIEF VALVE
When necessary to replace the pressure relief valve,
located in the com pressor rear head casting, the valve
assembly should be removed after P U R G IN G T H E
SYSTEM O F R E F R IG E R A N T and a new valve and gasket
installed. The entire system should then be "Evacuated and
Recharged." (Fig. 23).
INTERNAL M E C H A N IS M
Service operations to the rear head or internal
mechanism of the com pressor
should be performed
w ith the compressor removed from the vehicle
to
insure that the necessary degree of cleanliness may be
maintained. Clean hands, clean tools and a clean bench,
preferably covered w ith clean paper, are of extreme
importance.
A n inspection should be made of the internal
mechanism assembly to determ ine if any service operations
should be performed. A detailed inspection of parts should
be made to determ ine if it is economically feasible to replace
them.
Remove
1. Before proceeding with disassembly, wipe exterior
surface of com pressor clean.
2. All oil in com pressor should be drained and
measured. Assist draining by positioning compressor with
oil drain plug down.
Record the amount of oil drained
from the compressor.
Fig. 2 3 —Hi. Press. Relief V a lv e L o ca tion
DISCHARGE SYSTEM BEFORE
REMOVING HIGH PRESSURE
RELIEF VALVE
HI. PRESS.
RELIEF
VALVE
REAR HEAD