Unit Repair - GMC T Series 1994 Repair Manual

suction pressure will be above the control point; the valve will
m aintain a bleed from
crankcase-suction pressure differential; and the com pressor
will have m axim um displacem ent. W hen the A/C capacity
dem and is low er and the suction pressure reaches the control
point, the valve will bleed discharge gas into the crankcase and
close off a passage from the crankcase to the suction plenum.
T he angle o f the w obble-plate is controlled by a force balance
on the five pistons. A slight elevation o f the crankcase-suction
pressure differential creates a total force on the pistons
resulting in a m ovem ent about the w o b b le-p late pivot pin that
reduces the plate angle.
The com pressor has a unique lubrication system. The
crankcase-suction bleed is
w obble-plate for lubrication o f the w obble-plate bearing. The
MINOR VS COMPRESSOR REPAIR
Illustrations used in the follow ing operations show the
com pressor rem oved from the car for easier viewing. Refer to
Air C onditioning (Section IB ) for com pressor rem oval where
necessary.
W hen servicing the com pressor, rem ove only the parts
that prelim inary diagnosis show in need o f service.
R em oval and installation o f external com pressor parts,
and disassem bly and assem bly o f internal parts, must be
perform ed on a clean w orkbench. The w ork area, tools and
parts m ust be kept clean at all times.
Fig. 2 V5 Compressor Rear Head Details
crankcase to suction:
routed through the rotating

UNIT REPAIR

rotation acts as an oil separator, w hich rem oves som e o f the oil
no from the crankcase-suction bleed, rerouting it to the crankcase
where it can lubricate the com pressor m echanism .
METRIC THREAD SIZE INFORMATION
1. C om pressor to m ounting bracket bolts.
Front
R ear
2. Suction-discharge port screw.
3. C om pressor shaft.
Internal hub-clutch drive assembly.
COMPRESSOR CLUTCH PLATE AND HUB
ASSEMBLY
Remove or Disconnect
C lam p the holding fixture J 34992 in a vise and attach
com pressor to holding fixture w ith thum b screw s
J 34992-1 (Fig. 4).
2
. K eep the clutch hub and drive plate assem bly from
turning by using
J 33 0 2 7-A . Rem ove the shaft nut using shaft nut socket
J 33022 (Fig. 4).
3. Thread the C lutch Plate and H ub A ssem bly R em over
J 3 3 0 13 -B into the hub. H old the body o f the rem over
w ith a w rench and turn the center screw into the rem over
body to rem ove the clutch plate and hub assem bly
(Fig. 5).
4.
Rem ove the shaft key and retain for reassem bly.
E3
Install or Connect
Install the shaft key into the hub key groove (Fig. 6).
A llow the key to project approxim ately 3.2 m m (1 /8 ")
out o f the keyway. The shaft key is curved slightly to
provide an interference fit in the hub key groove.
2 Be sure the frictional surface o f the clutch plate and the
.
clutch rotor are clean before installing the clutch plate
and hub assembly.
3. A lign the shaft key w ith the shaft keyw ay and place the
clutch plate and the hub assem bly onto the com pressor
shaft.
NOTICE:
Do not drive or pound on the clutch hub or
shaft. Internal dam age to com pressor m ay result.
R em ove the J 3 3 013-B rem over-installer center screw
and reverse the body direction on the center screw as
show n in Figure 7.
5. Install the clutch plate and hub installer J 3 30 1 3 -B w ith
bearing as show n in Figure 7.
The body o f the J 33013 -B installer should be backed off
sufficiently to allow the center screw to be threaded onto
the end o f the com pressor shaft.
M 10 x 1.5 - 6H
M 8 x l . 2 5 - 6 H
M l O x 1.25 - 6 H
M l O x 1 .5 - 6 H
M 9 x 1 .2 5 - 6 H
M 22 x 1 .5 - 6 H
the clutch hub holding tool