GMC 1989 Light Duty Truck, Repair Manual, Page: 67 / 998

R-4 AIR CONDITIONING COMPRESSOR 1B3-9
CLEANING AND INSPECTION
CLEANING
Clean
The frictional surfaces of the clutch plate and the
clutch rotor.
Shaft seal area thoroughly.
Cavity and O-ring groove for the high side high pres­
sure cut-off switch.
Front head and cylinder area. Remove any dirt or lint.
Compressor shell.
I?
INSPECTION
Inspect
Front head for cracks or damage.
C om pressor shell for cracks or burrs.
Staked areas for burrs.
COMPRESSOR ASSEMBLY
All parts required for servicing the internal com pressor
are protected by a preservation process and packaged in a
m anner which will elim inate the necessity of cleaning,
washing or flushing of the new parts. The parts can be used
just as they are removed from the service package. Seals
and protective packaging should be left intact until just prior
to installation.
DISCHARGE VALVE PLATE
-►4- Install or Connect (Figures 22 and 23)
Tools Required:
J 4245 Snap Ring Pliers
J 25008-A Holding Fixture
Cylinder and shaft assem bly in J 25008-A.
The discharge valve plates (figure 23).
Valve plate retainer rings using J 4245 (figure 22).
• The valve plates must be tight after the snap
rings are installed.
+ « -
FRONT HEAD AND MAIN
BEARING
Install or Connect (Figures 1 7 ,1 8 , 25 and 26)
Tools Required:
J 24895 Bearing Installer
1. The front head, with the neck down, on a flat surface
(figure 25).
2. The bearing using J 24895 (figure 25).
• The installer must seat against the front head to
ensure proper clearance.
3. 525 refrigerant oil on the belleville and thrust wash­
ers.
4. New thrust washer with the tang pointing up (figure
25).
5. New belleville washer with the high center in the up
position (figure 26).
6. New thrust washer with the tang pointing down.
7. 525 refrigerant oil on the O-ring.
COMPRESSOR SHELL
-►4“ Install or Connect (Figure 24)
6.
Tools Required:
J 25008-A Holding Fixture and Shell Installer
525 refrigerant oil to the O-rings.
O-rings in the grooves in the cylinder.
525 refrigerant oil to the O-ring surfaces of the shell.
Shell on the cylinder. Snug it up to the O-ring.
Installer J 25008-A to the holding fixture using long
bolts and plate washers. Make the bolts finger tight
(figure 24).
• Align the step projections of the installer to con­
tact evenly on both sides of the shell.
• Alternately tighten each bolt 1/4 turn. Use care
not to cock the shell, as normal installation is
not difficult if the shell remains even.
Bend the retaining strap down by tapping it gently
with a hammer.
Remove the shell installer.