GMC 1976 ZEO 6083 Maintenance Manual page 114

Figure 105-Shell-to-Front Head 0-Ring Installation
install compressor shaft seal as described in "Com-
pressor Shaft Seal" Replacement procedure.
27. Install compressor clutch coil and housing
assembly as described in "Compressor Clutch Coil
and Housing Assembly" Replacement procedure.
28 . Install compressor pulley and bearing assem-
bly as described in "Compressor Pulley and Bear-
ing" Replacement procedure.
29 . Install compressor clutch plate and hub as-
sembly as described in "Compressor Clutch Plate
and Hub Assembly" Replacement procedure.
30 . Add required amount of 525 viscosity refrig-
erant oil (See figure 41).
31 . Check for external and internal leaks as de-
scribed in the following "Compressor Leak Testing"
procedure.
AIR CONDITIONING SYSTEM 1- 9 7
SLIGHTLY ROTATE
FRONT HEAD IF
NECESSARY TO
LINE UP LOCATOR
PINS AND HOLES
Figure 106-Installing Rear Head
COMPRESSOR LEAK TESTING -
EXTERNAL AND INTERNAL
COMPRESSOR BENCH-CHECK
PROCEDURE
1 . Install Test Plate J-9625 on rear head of com-
pressor.
2 . Attach center hose of gage manifold set on
Charging Station to a refrigerant drum standing in
an upright position and open valve on drum.
3 . Connect Charging Station HIGH and LOW
pressure lines to corresponding fittings on Test Plate
J-9625, using J-5420 Gage Adapters.
NOTE :
Suction port of compressor has large in-
ternal opening. Discharge port has small inter-
nal opening into compressor .
4. Open LOW pressure control, HIGH pressure
control and REFRIGERANT control on Charging
Station to allow refrigerant vapor to flow into com-
pressor.
5 . Using electronic-type Leak Detector, check for
leaks at pressure relief valve, compressor shell to
cylinder, compressor front head seal, rear head seal