GMC 1976 ZEO 6083 Maintenance Manual page 101

1- 84 AIR CONDITIONING SYSTEM
Figure 65-Removing Rear Discharge Valve Plate
6. Remove suction screen and examine for any
damage or contamination. Clean or replace if neces-
sary .
7. Paint an identifying mark on exposed face of
inner and outer oil pump gears and then remove
gears. Identifying marks are to assure that gears, if
reused, will be installed on identical position .
8. Remove and discard rear head to shell O-ring .
9. Carefully remove rear discharge valve plate
assembly . Use two small screwdrivers under reed
retainers to pry up on assembly (figure 65).
Do not
position screwdrivers between reeds and reed seats .
10 . Examine valve reeds and seats. Replace entire
assembly if any reeds or seats are damaged.
11 . Using two small screwdrivers, carefully
remove rear suction reed (figure 66).
Do not pry up on
horseshoe-shaped reed valves .
12 . Examine reeds for damage, and replace if
necessary.
13 . Using Oil Pick-Up Tube Remover J-5139
Figure 66-Removing Rear Suction Head
Figure 67-Removing Oil Pick-Up Tube
(figure 67), remove oil pick-up tube . Remove O-ring
from oil inlet.
14 . Loosen compressor from Holding Fixture J-
9396, place Internal Assembly Support Block J-
21352 over oil pump end of shaft and, holding
Support Block in position with one hand, lift com-
pressor from Holding Fixture with other hand . In-
vert compressor and position on bench with Internal
Assembly Support Block resisting on bench .
15 . Lift front head and compressor shell assem-
bly up, leaving internal mechanism resting on Inter-
nal Assembly Support Block.
CAUTION : To prevent damage to shaft, DO
NOT TAP ON END OF COMPRESSOR
SHAFT to remove internal mechanism . If
mechanism will not slide out of compressor
shell, tap on front head with a plastic ham-
mer.
16 . Rest compressor shell on its side and push
front head assembly through compressor shell,
being
careful not to damage sealing areas on inner side of front
head .
Discard O-ring .
It may be necessary to tap on outside of front
head, using a plastic hammer, to overcome friction
of O-ring seal between front head and compressor
shell.
17 . Wipe excess oil from sealing surfaces on front
head casting webs and examine sealing surface. If
any surface damage is observed, the head should be
replaced .
18 . Remove front discharge valve plate assembly
and front suction reed plate. Examine reeds and
seats. Replace necessary parts.