Compressor Clutch Plate And Hub Assy; Compressor Clutch Rotor And/Or Bearing - GMC 1982 Light Duty Truck Service Manual

1C1-2 AIR C O N D ITIO N IN G COMPRESSOR O VERHAUL
Fig. 1C 1-1 R-4 Compressor, V Groove Pulley Type
Fig. 1C 1-2 R-4 Compressor, Poly Groove Pulley Type
R-4 C O M P R E S S O R C L U T C H PLATE A N D HUB
A S M .
Remove
1. If compressor is on the car, loosen compressor mounting
brackets, disconnect the compressor drive belt and reposition
the compressor for access, if necessary.
If compressor has been removed from the car, attach the
compressor to Holding Fixture J 25008-1, and clamp the
Holding Fixture in a vise (Fig. 1C1-6).
• Compressor mounting holes are metric. Use proper
metric bolts with holding fixture J 25008-1.
2. Keep the clutch hub from turning with the Clutch Hub
Holding Tool J 25030, remove, and discard the shaft nut,
using Thin Wall Socket J 9399, Fig. 1C 1-7.
3. Thread the Clutch Plate and Hub Assembly Remover J 9401,
into the hub. Hold the body of the Remover with a wrench
and turn the center screw into the Remover body to remove
the Clutch Plate and Hub assembly (Fig. 1C1-8).
4. Remove the shaft key.
Replace
1. Install the shaft key into the hub key groove (Fig. 1C 1-9).
Allow th key to project approximately 4.8mm (3/16") out of
the keyway.
The shaft key is curved slightly to provide an interference fit
in the shaft key groove of the hub.
2. Be sure the frictional surface of the clutch plate and the clutch
rotor are clean before installing the Clutch Plate and Hub
assembly.
R - 4 C O M P R E S S O R
(1 0 .0 C U . I N .
D IS P L A C E M E N T )
2 1 0 4 4 0
[~T]
P O L Y ­
G R O O V E
P U L L E Y
R O T O R
|~2~| H IG H
P R E S S U R E
C U T O F F
S W IT C H
(IF U S E D )
[~3~| H IG H
P R E S S U R E
R E L I E F
V A L V E
2 1 0 7 3 0
3. Align the shaft key with the shaft key way and place the
Clutch Plate and Hub assembly onto the compressor shaft.
NOTICE:
To avoid internal damage to the compressor, do not
drive or pound on the clutch hub or shaft.
4. Install the Clutch Plate and Hub Installer J 9480-01 as
illustrated in Fig. 1C 1-10.
5. Hold the hex portion of the Installer Body J 9480-1 with a
wrench and tighten the center screw to press the hub onto
the shaft until there is a .5mm - 1.0mm (.020"-.040") inch
air gap between the frictional surfaces of the clutch plate and
clutch rotor.
6. Install a new shaft nut with the small diameter boss of the
nut against the crankshaft shoulder, using Thin Wall Socket
J 9399. Hold the Clutch Plate and Hub assembly with Clutch
Hub Holding Tool J 25030, and tighten to 14 N-m (10 lb.
ft.) torque, using a 0-60 N*m (0-25 lb.ft.) torque wrench.
7. If operation is performed with compressor on car, connect
drive belt, tighten mounting brackets and adjust belt tension.
R-4 C O M P R E S S O R C L U T C H R O T O R A N D / O R
B E A R I N G - V G R O O V E TY P E
Remove
1. Remove the Clutch Plate and Hub assembly as described in
"R-4 Compressor Clutch Plate & Hub Asm." Removal
procedure.
2. Remove Rotor and Bearing assembly retaining ring, using
Snap Ring Pliers J 6083, Fig. 1C1-11. Mark the location of
the clutch coil terminals.
If only the Clutch Rotor and/or Rotor Bearing are to be
replaced, bend the lockwashers away from the pulley rim
mounting screws (see Fig. 1C 1-12), and remove the six (6)
mounting screws and special lock washers before proceeding
with Step 3. Discard the lock washers.
3. Install Rotor and Bearing Puller J 25031-2 down into the
rotor until the Puller arms engage the recessed edge of the
rotor hub. Hold the Puller and arms in place and tighten the
Puller screw against the Puller Guide to remove the Clutch
Rotor and Bearing assembly (Fig. 1C 1-12 and 1C1-13), being
careful not to drop the Puller Guide.
4. If the pulley rim mounting screws and washers were removed
in Step 2, only the Clutch Rotor and Bearing assembly will
be removed for replacement. The Clutch Coil and Housing
assembly is pressed onto the Front Head of the compressor
with a press fit and will not be removed unless the pulley rim
mounting screws are left securely in place and the pulley rim
pulls the Coil and Housing assembly off with the total Clutch
Rotor and Pulley Rim Assembly.
5. Place the Rotor and Bearing assembly on blocks as shown
in Fig. 1C1-14. Drive the bearing out of the rotor hub with
Rotor Bearing Remover J 9398.
It is not necessary to remove the staking at the rear of the
rotor hub to remove the bearing. However, it will be necessary to
file away the old stake metal for proper clearance for the new
bearing to be installed into the rotor bore or bearing may be
damaged (see Fig. 1C1-15).
Replace
1. Place the Rotor and Hub assembly face down on a clean, flat
and firm surface.
2. Align the new bearing squarely with the hub bore and using
Pulley and Bearing Installer J 9481 with Universal Handle
J 8092, drive the bearing fully into the hub (Fig. 1C1-16). The
Installer will apply force to the outer race of the bearing if
used as shown.
3. Using a center punch with a 45° angle point, stake 1.1-1.4mm
(0.45"-.055" deep) the bearing in three places 120° apart as