Compressor Thrust And Belleville Washers; R-4 C O M P R E S S O R M A In B E A R In G - GMC 1982 Light Duty Truck Service Manual

1C 1-14 AIR C O N D ITIO N IN G COMPRESSOR OVERHAUL
Fig. 1C 1 -36 Removing Front Head Asm.
2. Dip the new front head O-ring in clean 525 viscosity
refrigerant oil and install in the seal groove on the front head
(Fig. 1C1-36).
3. Position the oil hole in the Front Head to be "up" when
assembled to the compressor cylinder to correspond with the
"up" position of the compressor. Install the Front Head and
tighten the front head mounting screws to 27 N*m (20 lb.
ft.) torque.
4. Install new specification Service Shaft Seal kit (Fig. 1C1-28)
as described in "R-4 Compressor Shaft Seal" Replacement
procedure.
5. Install the Clutch Rotor and Bearing assembly, Clutch Coil
and Pulley Rim assembly to the Front Head, using Rotor and
Bearing Installer J 26271 (Fig. 1C1-18).
Before fully seating the assembly onto the Front Head, be
sure the clutch coil terminals are in the proper location in
relation to the compressor and that the three protrusions on
the rear of the clutch coil align with the locator holes in the
Front Head.
6. Install the rotor and bearing assembly retainer ring and
reassemble the Clutch Plate and Hub assembly as described
in "R-4 Compressor Clutch Plate and Hub" Replacement
procedure. Check to see that the clutch plate to clutch rotor
gap is .5 - 1.0mm (.020 - .040) inches.
7. "Evacuate and Charge the Refrigerant System" according to
the directions in Section 1B1.
R-4 C O M P R E S S O R T H R U S T A N D BELLEVILLE
W A S H E R S
Remove and Replace
1. "Discharge the Refrigerant System" according to the
directions in Section IB 1.
2. Remove the Front Head assembly as described in "Front
Head" Removal procedure. Remove and discard the front
head O-ring seal.
3. Remove the two thrust washers and one belleville washer
from the compressor shaft. Note the assembled position of
the washers.
4. Install a new thrust washer on the compressor shaft with the
thrust washer tang pointing "up" (Fig. 1C 1-37).
5. Install the new belleville washer on the shaft with the high
center of the washer "up."
6. Install the remaining thrust washer on the shaft with the tang
pointing "down" (Fig. 1C1-37).
7. Lubricate the three washers with clean 525 viscosity
refrigerant oil and assemble the Front Head and new O-ring
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O I L H O L E
T O S H A F T
A R E A
|~2~| F R O N T
H E A D
S E A L I N G
R IN G
I 3 1 M A I N
B E A R I N G
r n T H R U S T
W A S H E R S
A N D
B E L L E V I L L E
W A S H E R
2 1 0 4 6 1

R-4 C O M P R E S S O R M A IN B E A R IN G

Remove
Replace
r n
t h r u s t
W A S H E R
[~2~| B E L L E V I L L E
W A S H E R
Fig. 1C 1-37 Replacing Thrust and Belleville Washers
onto the compressor as described in "R-4 Compressor Front
Head" Replacement procedure.
1. "Discharge the Refrigerant System" according to the
direction in Section 1B1.
2. Remove the Front Head assembly as described in "Front
Head" Removal procedure. Discard front head O-ring.
3. Place the Front Head assembly on two blocks, as shown in
Fig. 1C1-38, and use Main Bearing Remover J 24896 to drive
the Main Bearing out of the Front Head.
1. Place the Front Head "with neck-end down" on a flat, solid
surface.
2. Align the new Main Bearing and the Bearing Installer J 24895
squarely with the bearing bore of the Front Head and drive
the bearing into the Front Head. The Installer J 24895 must
seat against the Front Head to insert the bearing to the proper
clearance depth (see Fig. 1C1-39).
3. Assemble the Front Head to the cylinder, using a new O-ring
as described in "R-4 Compressor Front Head" Replacement
procedure.
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