Removing Rear Thrust Races And Bearings - Pontiac Grand Prix Service Manual

1A-20 1969
PONTIAC SERVICE MANUAL
Fig.
1A-26
Removing Rear Thrust Races and Bearings
NOTE: If thrust bearings and races are to be replaced,
use parts as outlined below; otherwise use existing
bearings and races.
1. Secure four ZERO thrust races, three ZERO shoe
discs and two new thrust bearings.
2. Stack a ZERO thrust race, a new needle thrust
bearing and a second ZERO thrust race. Assemble this
"sandwich" of parts to FRONT end of compressor
main shaft.
3. Place FRONT half of cylinder on J 9397 compress-
ing fixture. Insert threaded end of shaft (with front
bearing assembly) through front main bearing and
allow thrust race assembly to rest on hub of cylinder.
4. Stack a ZERO thrust race, a new thrust bearing and
a second ZERO thrust washer. Assemble this "sand-
wich" of parts to REAR of compressor main shaft so it
rests on hub of swash plate (Fig. 1A-28).
5. Apply a light coat of clean refrigerant oil to ball
pockets of each of three pistons.
6. Place balls in piston pockets.
7. Apply a light coat of clean refrigerant oil to cavity of
three new ZERO shoe discs.
8. Place a ZERO shoe over each ball in FRONT end
of piston. Front end of piston has an identifying notch
in casting web (Fig. 1A-25).
9. Place a ball only in rear ball pocket of each of three
pistons (Fig. 1A-29).
NOTE:
Do not assemble any piston rings at this time.
10. Rotate shaft and swash plate until high point of
swash plate is over piston cylinder bore, which had
been identified as No. 1. Insert front end of No. 1
piston (notched end) in cylinder bore (toward the front
of compressor) and at same time, place front ball and
shoe and rear ball only over swash plate (Fig. 1A-3 1).
NOTE: It may be necessary to lift shaft assembly to aid
in installing pistons. Hold ji-ont thrust bearing pack
tightly against swash plate hub while lifting shaft (Fig.
1A-30).
11. Repeat this operation for No. 2 and No. 3 pistons.
Balls and shoes must adhere to piston during this
assembly.
12. Align rear cylinder casting with bores, suction
passage, discharge crossover holes, dowel pins, etc.
Tap into place using a hard wood or plastic block and
mallet (Fig. 1A-3 1).
13. Place cylinder assembly in J 9397 compressing
fixture with front of compressor shaft pointing down,
positioning discharge tube opening between fixture
bolts. This will permit access for the feeler gauge.
Assemble fixture head ring and nut to the cage,
tighten nuts evenly to 25 lb. ft. t o r q u e t ~ i g . 1A-32).
14. Use a leaf-type feeler gauge to check clearance
between REAR ball and swash plate for each piston as
follows:
a. Use J 9661 gauge set selecting a suitable feeler
gauge leaf until the result is a 4 to 8 oz. pull on the
scale between ball and swash plate (Fig. 1A-33). If the
pull is just less than 4 ozs.; add .0005" to the thickness
of the feeler stock used to measure the clearance. If the
pull on the scale reads just over 8 ozs., then subtract
.0005" from the thickness of the feeler stock. Select a
shoe accordingIy.
b. Rotate the shaft approximately 120" and make a
second check with feeler gauge between same ball and
plate.
c. Rotate shaft again approximately 120" and repeat
check with feeler gauge between these same parts.
d. From this total of three checks between the same
ball and swash plate at 120" increments on swash plate
for each piston, use the minimum gauge reading to
select a nlimbered shoe to correspond to this reading
(Fig. 1A-34).
.
NOTE: A selection will be made from shoe packages
shown in Fig. 1A-34, which will provide a .0005" to
.001U' total clearance between shoes and the swash plate
at the tightest point throughout its 36P rotation. The
reading or resultant reading will correspond to the last
three numbers of the part number of the part to be used.