Cylinder And Shaft Assembly Replacement; Leak Testing - Chevrolet 1988 Light Duty Truck Repair Manual

1B3-12 R-4 AIR CONDITIONING COMPRESSOR
5. Clutch drive hub (3).
CYLINDER AND SHAFT
ASSEMBLY REPLACEMENT
R em o ve or D isco nn ect (F ig u re 1)
1. Clutch drive hub (3).
2. Rotor (5) and bearing (6).
3. Shaft seal (12).
4. Front head (15).
5. Thrust (20) and Belleville (21) washers.
6. Shell (18).
7. Discharge plate (31).
8. High pressure cut-off switch (26).
9. Pressure relief valve (24).
Install or C on n ect (F ig u re 1)
1. Pressure relief valve (24).
2. High pressure cut-off switch (26).
3. Discharge reed (33) and plate (31).
4. Shell (18).
5. Thrust (20) and Belleville (21) washers.
6. Front head (15).
7. Shaft seal (12).
8. Rotor (5) and bearing (6) assembly.
9. Clutch drive hub (3).
Tools Required:
J 5420 Straight Fitting
J 9625-A Pressure Test Set w ith S chrader
Valve
J 23500-01 Portable Charging Station
Install J 9625-A on the rear head of the compressor.
Install the center hose of the manifold gage set on
the charging station to a refrigerant drum standing
in an upright position and an open valve on the
drum .
3. Install the charging station high and low pressure
lines to the corresponding fittings on J 9526-A using
J 5420 gage adapters or hoses equipped with valve
depressors.
• 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, the high-pres-
sure control and the refrigerant control on the
charging station to allow refrigerant vapor to
flow into the compressor.
Im po rtant
Check for leaks at the pressure relief
valve, com pressor front and rear head
seals, center cylinder seal, through bolt
head gaskets and the com pressor shaft
31. Valve Plate
33. Piston and Reed
A sse m bly
33
Figure 27 — Replacing the Discharge Plate

LEAK TESTING

• Loosen the manifold gage hose connections to
• If valve depressor-type hoses are used, loosen
4. D isconnect J 5420 from J 9625-A.
Rotate the com pressor (not the crank shaft or drive
5.
plate hub) to distribute oil to the cylinder and pis­
tons.
6
Install a shaft nut on the com pressor crankshaft if
.
the drive plate and clutch assem bly are not in­
stalled.
With a box-end wrench, or a socket and handle, ro­
tate the com pressor crankshaft or clutch drive plate
on the crankshaft to lubricate the piston assem bly
and cylinder wall.
Connect the J 23500-01 Portable C harging Station
high pressure line or a high pressure gage and
J 5420 gage adapter to the J 9625 test plate high-
side connector.
seal. A fter checking, shut off the low
pressure control and the high pressure
control on the charging station.
the gage adapters connected to the low and
high sides and allow the vapor pressure to re­
lease from the compressor.
the hose connections at the gage manifold to
release the vapor from the compressor.
F-01793