Pontiac FIREBIRD 1972 Service Manual page 141

1A-82 1972 PONTIAC SERVICE MANUAL
ASSEMBLE WITH NEW PARTS
Be sure to install all new seals, gaskets and O-rings. These
are all included in the compressor gasket kit.
1. Assemble a piston ring, scraper groove toward the
center of piston, to each end of three pistons.
Place front cylinder half on J 9397 compressing fix-
ture with compressor main shaft threaded end pro-
jecting downward through the fixture. Rotate swash
plate so high point is above cylinder base No. 1. With
open end of ring toward center of compressor, care-
fully assembly No. 1 piston (complete with ball and
a ZERO shoe on front end and ball and numbered
shoe on REAR end) over swash plate. Compress and
enter piston ring into front cylinder half. Repeat this
operation for pistons No. 2 and No. 3.
3. Assemble one end of service discharge crossover tube
into hole in front cylinder (Fig. 1A-94).
4. Rotate shaft to position pistons in a "stair step" ar-
rangement. Place rear cylinder half over shaft and
start pistons into cylinder bores.
5. Invert cylinder on fixture to complete assembly as
follows:
a. Compress piston ring on each piston so as to per-
mit its entrance into cylinder.
b. When all three pistons and rings are in their re-
spective cylinders, align end of the discharge
crossover tube with hole in rear cylinder half,
making sure flattened portion of this tube faces
inside of compressor (for swash plate clearance).
Fig. 1A-94 Installing Service Discharge Crossover Tube
I
O
SERVICE DISCHARGE
CROSS-OVER
TUBE KIT
Fig. 1A-95 Installing Service Discharge Crossover Parts
c. When satisfied that all parts are in proper align-
ment, tap with a fiber block mallet to seat rear
cylinder over locating dowel pins.
6. Generously lubricate all moving parts with clean re-
frigeration (525 viscosity) oil. Check for free rotation
of mechanism.
7. Check operation and smoothness of piston travel
before proceeding with remainder of assembly. If any
improper operation is observed during this check, the
mechanism may have to be regauged. Complete as-
sembly when correct operation is obtained.
8. Install crossover cover in cylinder.
9. Place internal mechanism in J 9397 compressing fix-
ture if cylinder head dowel pins are to be replaced.
10. Replace two dowel pins in front cylinder if previously
removed. (A rod drilled 1/4" deep to O.D. of dowel
pins will aid in installing pins.)
11. Remove internal mechanism from J 9397 fixture.
REPLACE:
1. Install service discharge crossover pipe, front O-ring
and spacer (Fig. 1A-95).
2. Assemble suction reed valve to front end of cylinder.
Align dowel pin holes, suction ports and oil return
slot.
3. Assemble front discharge valve plate, aligning holes
with-dowel pins and proper openings in head. (The
front discharge valve plate has a large diameter hole
in the center, Fig. 1A-96.)
4. Remove oil charging screw from compressor shell,
inspect for damage, dirt or contamination, clean and
replace.