chevrolet truck Light Duty Truck 1994 Series, Руководство по ремонту

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suction pressure will be above the control point; the valve will
m aintain a bleed from crankcase to suction: no
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
1. 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
2. S uction-discharge port screw.
M l O x 1 . 5 - 6 H
3. 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
2 .
3.
4.
E3
2
.
3.
5.
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.