GMC 1982 Light Duty Truck Service Manual page 128

1D-12 AIR CONDITIONING COMPRESSOR OVERHAUL
7. M ake an identifying m ark on exposed face of inner
and outer Oil Pum p G ears and then rem ove gears.
Identifying m arks are to assure th at gears, if re-used, will
be installed in identical position.
8. Remove and discard rear head to shell O-ring.
9. Carefully rem ove R ear D ischarge Valve Plate
assembly. Use two sm all screw drivers under reed retainers
to pry up on assembly (Fig. ID-26). D o not position
screwdrivers between reeds and reed seats.
REED RETAINERS
DISCHARGE REEDS
Fig. 1D-26 Removing A-6 Rear Discharge Valve Plate
10. Exam ine Valve Reeds and Seats. Replace entire
assembly if any reeds or seats are damaged.
11. Using two small screwdrivers, carefully remove
R ear Suction Reed (Fig. ID-27). D o not pry up on
horseshoe-shaped reed valves.
Fig. 1D-27 Removing A-6 Rear Suction Reed
12. Exam ine reeds for damage, and replace if necessary.
13. Using Oil Pick-Up Tube Rem over J 5139 (Fig. 1D-
28), remove Oil Pick-U p Tube. Remove O -ring from oil
inlet.
14. Loosen com pressor from Holding Fixture J 9396,
place Internal C ylinder and Shaft Assembly Support Block
J 21352 over oil pum p end of shaft and, while holding
Support Block in position w ith one hand, lift com pressor
from H olding Fixture w ith other hand. Invert com pressor
(shaft will now be facing upw ard) and position on bench
with Internal Assembly Support Block resting on bench.
REAR DISCHARGE
VALVE PLATE
ASSEMBLY
2 0 4 9 6 9
204971
OIL PICK-UP TUBE
REMOVER J-5139
Fig. 1D-28 Removing A-6 Oil Pick-Up Tube
15. Lift F ront H ead and C om pressor Shell Assembly
up, leaving Internal Cylinder and Shaft Assembly resting on
Internal Assembly Support Block.
NOTICE:
To prevent dam age to shaft, D O N O T T A P
O N E N D O F C O M PR E SSO R S H A FT to remove
Internal Cylinder and Shaft Assembly. If Internal
Assembly will not slide out of com pressor shell, tap on
F ro n t H ead with a plastic ham m er.
16. Rest com pressor shell on its side and push F ront
H ead assembly through Com pressor Shell, being careful not
to dam age sealing areas on inner side of front head. D iscard
O-ring.
It m ay be necessary to tap on outside of front head,
using a plastic ham m er, to overcome friction of O-ring seal
between front head and com pressor shell.
17. W ipe excess oil from sealing surfaces on front head
casting webs and examine sealing surface. If any surface
dam age is observed, the head should be replaced.
18. Rem ove F ro n t D ischarge Valve Plate assembly and
F ro nt Suction Reed Plate. Exam ine reeds and seats. Replace
necessary parts.
19. Rem ove Suction Cross-Over Cover by prying with
screw driver between cylinder casting and cover (Fig. 1D-
29).
CYLINDER
ASSEMBLY
Fig. 1D-29 Removing A-6 Suction Cross-Over Cover
OIL PICK-UP TUBE
SUCTION
PASS
COVER
204958