Leak Testing - GMC 1990 Light Truck Repair Manual

Figure 39 — Installing the Compressor to J 33026
Tools Required:
J 9625-A Pressure Test Plate
J23500-01 Portable Charging Station
J 33026 Compressor Holding Fixture
• Be sure the compressor has no oil internally.
1. Install J 9625-A on the rear head of compressor (fig­
ure 3).
2. Install the center hose of the manifold gage set on
J 23500-01 to a refrigerant drum standing in an
upright position and open the valve on the drum.
3. Install the charging station high and low pressure
lines to corresponding fittings on J 9625-A using
J-5420 gage adapters or hoses equipped with valve
depressors. Suction port (low side) of the compressor
has large internal opening. Discharge port (high side)
has a smaller internal opening into the compressor.
• Open the low pressure control, high pressure control
and the refrigerant control on the charging station to
allow refrigerant vapor to flow into the compressor.
Important
Check for leaks at pressure relief valve (32), compres­
sor front and rear head seals (15) (24), center cylinder
seal (22), through bolt head gaskets and compressor
shaft seal.
• After the leak check, shut off the low pressure control
and the high pressure control on charging station.
HR-6 AIR CONDITIONING COMPRESSOR 1B4-15
33026
B-06717

LEAK TESTING

• Leak test the compressor.
• Refer to " Leak Testing."
14. Clutch coil assembly (6).
15. Pulley (5).
16. Clutch plate and hub assembly (2).
• If an external leak is present, perform the necessary
correction and recheck to assure the correction.
• Loosen the manifold gage hose connections to the
gage adapters connected to the low and high sides
and allow the vapor pressure to release from the com­
pressor. If valve depressor type hoses are used,
loosen the hose connections at gage manifold to
release the vapor pressure from the compressor.
• Disconnect both gage adapters or hoses from
J 9625-A.
• Add 89 ml (3 oz.) new 525 viscosity refrigerant oil to
the compressor assembly. Rotate the complete com­
pressor assembly (not the shaft or drive plate hub)
slowly several turns to distribute oil to all cylinder and
piston areas.
• Install the shaft nut (1) on the compressor shaft (20) if
the pulley assembly and clutch plate and hub assem­
bly are not installed.
• Using a box-end wrench, or a socket and handle,
rotate the compressor shaft (20) or clutch plate on the
shaft (20) several turns to lubricate the pistons and
cylinder walls.
• Connect the charging station high-pressure line, or a
high-pressure gage and gage adapter to J 9625-A
high-side connector.
• Attach an adapter or depressor-type hose to the suc­
tion or low-pressure port of J 9625-A to open the Sch­
rader-type valve. Oil will drain out of the compressor