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AIR CONDITIONING 3E-11
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(3) Close manifold gauges after
completion of
charging, and check high and low pressures and system
operation.
(4) Read gauges with high and low pressure valves
on charging station closed. The low pressure gauge could
be damaged if both high and low pressure valves of
manifold are opened. The high pressure developed in
discharge side (high side) of compressor would peg in-
dicator needle of low pressure gauge and damage it.
(5) Close all valves on charging station and close
refrigerant
drum valve when all operations
are
completed.
(6) Upon completion of operational check, back-seat
suction and discharge service valves to their normal
o p e r a t i n g
p o s i t i o n
b y t u r n i n g
t h e m
f u l l y
counterclockwise.
(7) Disconnect high and low pressure charging
hoses from compressor with care. (A small amount of
refrigerant remaining in hoses will escape.) Replace
charging hoses on hose holder on charging station to
keep air and dirt out of hoses.
(8) Open valve at top of cylinder to remove remain-
ing refrigerant.
NOTE: The charging cylinder is not designed to store
refrigerant
(9) Replace quick seal caps on compressor service
valves when service is complete.
COMPRESSOR
The compressor is the belt-driven, two-cylinder recip-
rocating type. It is attached to the engine with a mount-
ing bracket as shown in figures 3E-10 and 3E-11.
Fig. 3E-10
Compressor Mounting—Elght-Cyllead®r
I D L E R
Fig. 31*11
Compressor Mounting—Sii-Cflliiir
Ceipressor Valve Leak Diagnosis
The compressor should be at operating temperature to
perform an accurate test.
(1) Install Pressure Gauge and Manifold Assembly
J-23575.
(2) Front-seat suction and discharge service valve
by turning them clockwise.
(3) Discharge refrigerant remaining in compressor
by opening suction gauge hand valve slowly.
(4) Open suction gauge hand valve and close high
pressure gauge hand valve.
(5) Start engine and operate compressor. Pressure
will build up rapidly. Stop compressor at 150 to 200
pounds pressure.
NOTE: Pressure should hold if the discharge valve is
operating properly. Loss of pressure indicates
leaking
compressor discharge valve or head gasket
Compressor Belt Tension
Belt tensions are important and should be inspected at
time of new vehicle pre-delivery and at subsequent
scheduled maintenance intervals.
Belt Tension Gauge, J-23600, will provide accurate
belt tension adjustments. Install the gauge on the long-
est accessible belt span. Belt tension for new vehicle pre-
delivery and all belts with previous service should be 90
to 115 pounds.
Six-cylinder belt tension is adjusted by the idler
mounting bracket. Eight-cylinder belt tension is ad-
justed by the alternator.
When a new belt is installed, it should be adjusted to
125 to 155 pounds (155 preferred) tension to compensate
for the initial run-in loss that occurs within the first
several minutes of operation.
NOTE: New-belt
tension specifications
apply only to
service replacement
belts. Once a belt has been ten-
sioned and run, it is considered a used belt and should be
adjusted to used-belt
specifications.
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Troubleshooting
