Pontiac FIREBIRD 1972 Service Manual page 143

1 A-84
1972 PONTIAC SERVICE MANUAL
Place an O-ring on the oil pick-up tube, apply oil to
cavity and O-ring. Insert tube and O-ring (Fig. 1A-
99), rotating compressor mechanism as necessary
and align tube with hole in the shell baffle. Be sure
O-ring and intake tube are properly seated.
Replace split dowel pins (in rear cylinder) if previ-
ously removed. (A rod drilled 1/4" deep to O.D. of
dowel pins will aid in installing pins.)
Install service discharge crossover pipe rear O-ring
and spacer.
Position rear suction reed valve to align with dowel
pins, reed tips and ports in head.
Position rear discharge valve assembly to align with
dowel pins and ports and slide it into place over pins.
Position rear head casting to align with dowel pins.
Rotate mechanism assembly back and forth by hand,
if necessary, to permit this alignment and assure
proper seating of front head cylinder assembly.
Remove rear head from this trial assembly.
Assemble inner oil pump gear over "DM shaped flat
on shaft. Place outer oil pump gear over inner oil
pump gear.
Before attempting the final assembly of the rear head
casting, position outer gear as follows:
a. Observe position of oil pump in shell.
b. Note position of pump race in head.
c. Align pump (Fig. 1A-100) with head and install
head.
REPLACING REAR HEAD ASSEMBLY
1. Generously oil valve plate around outer edge where
large O-ring will be placed. Oil valve reeds, pump
gears and area where teflon gasket will contact valve
plate.
2. Coat new head-to-shell O-ring with oil and place it on
valve plate in contact with shell.
3. Replace suction screen in rear head.
4. Assemble rear head to compressor shell, using care
not to damage sealing surface (Fig. 1A-101).
5. Assemble new nuts to threaded shell studs and
tighten (25-28 lb. ft. torque).
6. Replace pressure relief valve, if removed, using new
copper washer.
CAVITY
BETWEEN
GEAR TEETH
(3 O'CLOCK)
OIL DRAIN
PLUG
Fig. 1 A - 1 0 0 Positioning Oil Pump Outer Gear
7. Coat the new seal seat O-ring with clean refrigerant
oil and install it in its groove in the compressor neck.
Tool J 21508 may be used.
8. Place seal protector over end of shaft. Coat O-ring
and face of new seal assembly with clean refrigerant
oil and install new seal assembly on shaft, using J
9392.
9. Coat face of new seal seat with clean refrigerant oil
and install seat, using tool J 23128. Be sure seal seat
O-ring is not dislodged and seal seat is making a good
seal with the O-ring.
10. Install new seal seat retainer ring with tool J 5403,
with flat face against seal seat. The sleeve from tool
J 9393 may be used to press on the retainer ring so
that it snaps into place (Fig. 1A-102).
Fig. 1 A - 1 0 1 Installing Rear Head