Pontiac FIREBIRD 1972 Service Manual page 137

1A-78 1972 PONTIAC SERVICE MANUAL
Fig. 1A-83 Removing Rear Thrust Races and Bearing
Remove rear combination of thrust races and thrust
bearing (Fig. 1A-83). Discard all three pieces.
Push on shaft to remove shaft from front cylinder
half.
Remove front combination of thrust races and thrust
bearing. Discard all three pieces.
Examine swash plate surfaces for excessive scoring or
damage. If satisfactory, reuse. If necessary, replace
main shaft and swash plate assembly.
Wash all parts to be reused in a tank of clean alcohol
or similar solvent. Blow all parts dry using clean, dry
air.
Examine the front and rear cylinder halves and re-
place if cylinder bores are deeply scored or damaged.
(NOTE: The service cylinder assembly contains a
front half and a rear half doweled together and two
main bearings; one main bearing pressed into the
proper location in the front half and the other in its
proper location in the rear half.)
Check main shaft bearings for roughness and replace
if necessary. Use J 9592 to replace bearings.
Fig. 1A-84 Mainshaft Thrust Bearing Installed
1. Secure four ZERO thrust races, three ZERO shoe
discs and two new thrust bearings.
2. Stack a ZERO thrust race, a new thrust bearing and
a second ZERO thrust race. Assemble this "sand-
wich" of parts to FRONT end of compressor main
shaft.
3. Place FRONT half of cylinder on J 9397 compressing
fixture. Insert threaded end of shaft (with front bear-
ing assembly) through front cylinder half 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-84).
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 (Fig. 1A-85). Front end of piston has an identi-
fying notch in casting web.
GAUGING FOR NEW PARTS
Obtain the parts discussed in the introduction of this sec-
tion. If thrust bearings and races are to be replaced, use
parts outlined in following procedure; if not, use existing
bearings and races.
9. Place
a
ball only in rear ball pocket of each of three
pistons. 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