GMC S Series 1994 Repair Manual Download

Page: 53 / 919

suction pressure will be above the control point; the valve will

m aintain

bleed

from

crankcase

suction:

crankcase-suction  pressure  differential;  and  the  com pressor
will  have  m axim um   displacem ent.  W hen  the  A/C  capacity
d em and  is  low er  and  the  suction  pressure  reaches  the  control
point,  the  valve  will bleed  discharge gas  into the crankcase and
close  o ff 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
p ressure  differential  creates  a  total  force  on  the  pistons
resulting  in  a  m ovem ent  about the  w o b b le-p la te  pivot  pin  that
reduces the  plate  angle.

T he com pressor has a unique lubrication system. The

crankcase-suction bleed is routed through the rotating
w obble-plate for lubrication o f the w obble-plate bearing. The

rotation acts as an oil  separator,  w hich rem oves  som e o f the oil
from  the  crankcase-suction  bleed,  rerouting  it to the crankcase
where it can  lubricate  the com pressor m echanism .

METRIC THREAD SIZE INFORMATION

C om pressor to m ounting bracket bolts.

F ront

M 10 x 1.5 - 6H

R ear

M 8 x l . 2 5 - 6 H
M l O x 1.25 - 6 H

S uction-discharge port screw.

M l O x 1 . 5 - 6 H

C om pressor shaft.

M 9 x 1 .2 5 - 6 H

Internal hub-clutch drive assem bly.

M 22 x 1 .5 - 6 H

UNIT REPAIR

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
A ir C onditioning (Section IB ) for com pressor rem oval w here
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,  m ust  be
perform ed  on  a  clean  w orkbench.  The  w ork  area,  tools  and
parts  m ust be kept clean  at all  tim es.

COMPRESSOR CLUTCH PLATE AND HUB

ASSEMBLY

Fig. 2 V5 Compressor Rear Head Details

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 3 4 9 92-1 (Fig. 4).

K eep the clutch hub and drive plate assem bly from
turning

by using the

clutch

hub holding tool

J 3 3 0 2 7 -A . R em ove the shaft nut using shaft nut socket
J 33022 (Fig. 4).

Thread  the  C lutch  Plate  and  H ub  A ssem bly  R em over
J  3 3 0 1 3 -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).

R em ove the shaft key and retain for reassem bly.

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.

Be sure the frictional surface o f the clutch plate and the

clutch rotor are clean before installing the clutch plate
and hub assem bly.

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 0 1 3 -B rem over-installer center screw
and reverse the body direction on the center screw as

show n in Figure 7.

Install the clutch plate and hub installer J 3 3 0 1 3 -B w ith
bearing as show n in F igure 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.

GMC S Series 1994, Repair Manual

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