Pontiac tempest 1968 Service Manual page 54

CUSTOM A I R C O N D I T I O N I N G
1A-27
F i g . 1A-42 Installing O i l Intake (Pick-Up) Tube
11. Replace split dowel pins (in rear cylinder) if
previously removed.
NOTE: A rod drilled 1/4" deep to O.D. of dowel
pins will aid in installing pins.
12. Install service discharge crossover pipe rear
O-ring and spacer.
13. Position rear suction reed valve to align with
dowel pins, reed tips, and ports in head.
14. Position rear discharge valve assembly to
align with dowel pins and ports and slide it into
place over pins.
15. Position rear head casting to align with dowel
pins. Rotate mechanism assembly back and forth by
hand, if necessary, to permit this alignment and as-
sure proper seating of front head cylinder assembly.
Remove rear head from this trial assembly.
16. Assemble inner oil pump gear over " D "
shaped flat on shaft. Place outer oil pump gear over
inner oil pump gear.
NOTE: Before attempting the final assembly of
the rear head casting, position outer gear as
follows:
a. Observe position of oil sump in shell.
b. Locate approximate center line of this sump.
c. While facing centerline of this sump and
viewing from the back of compressor, move outer
pump gear to L E F T until it is at approximately
90° (at 9 o'clock position) from centerline of oil
sump (Fig. 1A-44).
COMPRESSOR REAR HEAD ASSEMBLY
REPLACE
1. Generously oil valve plate around outer edge
where large O-ring will be placed. Oil valve reeds,
oil 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 teflon gasket (Fig. 1A-45).
5. Assemble new nuts to threaded shell studs.
Tighten 25-28 lb. ft. torque.
6. Replace pressure relief valve, if removed,
using new copper washer.
OIL S U M P
F i g . 1A-43 Positioning O i l Pump Outer G e a r Fig. 1 A - 4 4 Installing Rear Head