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24-32
AIR
CONDITIONING
trance o f moisture and
dirt.
Never use engine o i l as
a substitute f o r refrigerant oil.
EPR
Valve-Replacement
(1) Remove the two EPR valve suction line fitting
bolts, the fitting which also contains the compressor
suction screen, spring, and the gasket.
(2) Remove the "EPR" valve and
"0" ring from
the compressor using Tool C-3822, by rotating the
valve counterclockwise slightly, as shown in Fig. 41.
(3) To install, place the
"0"
ring on the "EPR'
valve.
(4)
Lubricate the
"0"
ring with refrigerant oil and
install the "EPR" valve in the compressor with Tool
C-3822 and rotating the valve counterclockwise.
(5)
Install the compressor suction screen in the
"EPR" valve suction line fitting.
(6) Install the suction line fitting gasket, spring,
fitting, and attaching bolts.
Compressor-Removal
(1)
Discharge the system. Refer to "Discharging
The System," TEST
7
in INSPECTION, TEST PROCE-
DURES AND DIAGNOSIS.
(2) Measure and record the refrigerant oil level
so
that the oil level of a replacement or repaired com-
pressor can be adjusted to the
exact level in t h e com-
pressor removed f r o m t h e vehicle.
(3) Disconnect the suction and discharge lines at
the muffler fittings.
CAUTION: P l u g o r cap a l l lines as soon as they are
disconnected t o keep moisture out of t h e system.
(4)
Disconnect the magnetic clutch-to-control-unit
(5)
Loosen and remove the compressor pulley belts.
(6) Remove the compressor-to-bracket attaching
wire.
bolts, and remove the compressor.
TOOL
Fig. 41-Removing
or
Installing EPR Valve
!
Fig. 42-Valve
Plate and Head Removing Lip
Installation
the attaching bolts.
(1)
Install the compressor to bracket, and tighten
(2) Install the compressor pulley belts.
(3) Connect the magnetic clutch-to-control-unit
(4)
Remove the caps or plugs, connect the suction
CAUTION: W h e n replacing t h e compressor arrem-
bly,
the crankshaft should be rotated
by
hand at
least t w o complete revolutions, t o clear o i l accumu-
lation f r o m the compressor head before t h e clutch
is energized t o avoid damaging t h e compressor
reed valves.
NOTE: A f t e r the compressor is installed, it is
im-
perative that t h e o i l level
in
t h e compressor
be
ad-
justed t o t h e level registered before removing t h e
compressor.
If
t h e original o i l level is not known,
adjust the level t o two inches if positioned a t t h e
vehicle installation angle measures through o i l
fill-
3r
opening.
wire.
and discharge lines.
Cylinder Head and Valve Plate-Removal
(1)
Remove the cylinder head bolts and the head
and valve plate assembly. If the plate does not sepa-
rate from the head, tap the removing lip on the valve
plate lightly with a plastic hammer (Fig. 42). Do not
pry apart.
Inspection
After removal of the head, plate and gaskets, ex-
amine the valves. If the valves are broken and dam-
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