Compressor Service; Service Valve Leak Test; Compressor Isolation - Jeep 1987 Wrangler Workshop Manual

HEATING AND AIR CONDITIONING
AIR CONDITIONING SYSTEM
COMPRESSOR SERVICE
86923
If the air gap varies at any point, lightly pry the
plate upward at minimum variations or tap
downward at maximum variations.
If the air gap is not or can not be set to speci-
fied limits, remove the hex nut and front plate
and add or substract shims as necessary.
NOTE: The air gap is determined by the spacer
shims. When assembling existing or replace-
ment clutch components try the original shims
first. When installing a replacement clutch on a
replacement compressor, use a 1.02-, 0.51-
and
0.13-mm
(0.040-, 0.020- and 0.005-in)
shim.
Service Valve Leak Test
The compressor should be at operating tem-
perature for an accurate test.
Install pressure gauge and manifold J 23575.
Front-seat the suction and discharge service
valves by turning them clockwise.
Discharge refrigerant remaining in the com-
pressor by slowly opening the suction service
valve.
Open the low pressure gauge hand valve and
close the high pressure gauge hand valve.
WARNING: Use extreme caution when the en-
gine is operating. Do not stand in a direct line
with the fan. Do not put your hands near the
pulleys, belts or fan. Do not wear loose
clothing.
Start the engine and operate the compressor.
Pressure will build up rapidly. Stop the engine
and compressor at 1 035-1 380 kPa (150-200
psi).
NOTE: Pressure should hold steady if the dis-
charge service valve is operating properly. A
loss of pressure indicates a leaking discharge
valve or compressor head gasket.
Compressor Isolation
It is not necessary to discharge the system for
compressor removal. The compressor can be
isolated from the remainder of the system and
L-40