Chevrolet 1988 Light Duty Truck Repair Manual page 84

1B4-12 DA-V5 AIR CONDITIONING COMPRESSOR
A. O p e n in g to R ear S u c tio n Port
(12 O 'C lo c k P o s itio n A s s e m b ly R e fe re n ce )
B. T h ro u g h B o lt H o le (6)
C. S u c tio n P re ssu re (O u ts id e C avity)
D. D is c h a rg e P re ssu re (In n e r C avity)
E. O p e n in g to R ear D is c h a rg e Port
F. H ig h P ressu re R e lie f Valve
G. D rille d O p e n in g in to H ig h
P re ssu re R e lie f Valve A rea
28. R ear H ead
Figure 27 — Positioning the J 33016 Guide Pins
12. Test plate J 9625-A.
• Leak test. Refer to " Leak Testing."
Tools Required:
J 9625-A Pressure Test Plate
J 23500-01 Portable Charging Station
J 34492 C om pressor Holding Fixture
• Be sure the com pressor has no oil internally.
1. Install J 9625-A on the rear head of the compressor.
2. Install the center hose of the manifold gage set on
J 23500-01 to a refrigerant drum standing in an up­
right position and open the valve on the drum.
3. Install the charging station high and low pressure
lines to the corresponding fittings on J 9625-A using
gage adapters or hoses equipped with valve depre­
ssors. The suction port (low side) of the com pressor
has a large internal opening. The discharge port
(high side) has a sm aller internal opening into the
compressor.
• Open the low pressure control, high pressure con­
trol and the refrigerant control on the charging sta­
tion to allow the refrigerant vapor to flow into the
compressor.
J 33016
J 35372
F-04576
Figure 28 — Installing the Rear Head Gasket
LEAK TESTING
| 2 j Im p o rta n t
• After the leak check, shut off the low pressure con­
• If an external leak is present, perform the necessary
• Loosen the manifold gage hose connections to the
• D isconnect both gage a dapters or hoses from
• Add 0.085 kg (3 oz.) new 525 viscosity refrigerant oil
• Check for leaks at the pressure relief valve (2),
com pressor front and rear head seals (37)
(39), through bolt head gaskets (32) and com ­
pressor shaft seal (29).
trol and the high pressure control on charging sta­
tion.
correction and recheck for leaks.
gage adapters connected to the low and high sides
and allow the vapor pressure to release from the
compressor. If valve depressor type hoses are used,
loosen the hose connections at the gage manifold to
release the vapor pressure from the compressor.
J 9625-A.
to the com pressor assembly. Rotate the com plete
com pressor assembly (not the shaft or drive plate
hub) slowly several turns to distribute oil to all cylin­
der and piston areas.