Leak Testing - Chevrolet 1988 Light Duty Truck Repair Manual

1B2-14 DA-6 AIR CONDITIONING COMPRESSOR
T ig h ten
• Six through bolts (7) alternately to 9 N m (84
in. lbs.).
13. Shaft seal parts (8).
Im p o rtan t
• Add new 525 viscosity refrigerant oil.
• Refer to vehicle service manual for fill quantity.
• Place shaft nut (1) on the shaft (20) and rotate
the com pressor shaft (20) several tim es and
remove nut (1).
• Leak test the compressor.
• Refer to " Leak Testing."
14. Clutch coil assembly (6).
15. Pulley (5).
16. Clutch plate and hub assem bly (2).
Tools Required:
J 9625-A Pressure Test Plate
J 23500-01 Portable Charging Station
J 33026 C om pressor Holding Fixture
• Be sure the com pressor has no oil internally.
1. Install J 9625-A on the rear head of com pressor (fig­
ure 3).
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 corresponding fittings on J 9625-A using
gage adapters or hoses equipped with valve depre­
ssors. Suction port (low side) of the com pressor has
large internal opening. 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 re frig e ra n t vapor to flow into the
compressor.
Im po rtant
Check for leaks at pressure relief valve (32),
com pressor front and rear head seals (15) (24),
center cylinder seal (22), through bolt head
gaskets and com pressor shaft seal.
Figure 3 8 — Installing the Com pressor to J-33026

LEAK TESTING

After leak check, shut off the low pressure
co ntro l and the high pressure co n tro l on
charging station.
If an external leak is present, perform the nec­
essary correction and recheck to assure the
correction.
If an external leak is present, perform the nec­
essary 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 re­
lease from the compressor. If valve depressor
type hoses are used, loosen the hose connec­
tions at gage manifold to release the vapor
pressure from the compressor.
Disconnect both gage adapters or hoses from
J 9625-A.
Add 0.085 kg (3 oz.) new 525 viscosity refriger­
ant oil to the com pressor assembly. Rotate the
complete com pressor assembly (not the shaft
or drive plate hub) slowly several turns to dis­
tribute oil to all cylinder and piston areas.
Install the shaft nut (1) on the com pressor
shaft (20) if the pulley assembly and clutch
plate and hub assem bly are not installed.