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CUSTOM AIR CONDITIONING
1 8-55
Fig. 1 8-95 1977 R-4
Compressor
When servicing the compressor, remove only the
necessary components that preliminary diagnosis indicates
are in need of service. Refer to Fig. 1B-96 and Fig. 1B-97 for
information relative to parts nomenclature and location.
Removal and installation of external compressor
components and disassembly and assembly of internal
components must be performed on a clean workbench. The
work area, tools and parts must be kept clean at
all times.
See "C.C.O.T. Refrigerant Oil Distribution" for specific
conditions of oil addition to the A/C system.
R-4 COMPRESSOR CLUTCH PLATE
AND HUB ASM.
Remove
1. If compressor is not removed from the car, loosen
compressor mounting brackets, disconnect the compressor
drive belt and reposition the compressor for access, if
necessary.
If compressor has been removed from the car, attach the
compressor to the holding fixture, J 25008-1, and clamp the
holding fixture in a vise (Fig. 1B-98).
2. Keep the clutch hub from turning with the Clutch
Hub Holding Tool, J 25030, and remove and discard the shaft
nut using Thin Wall Socket, J 9399, Fig. 1B-99.
3. Thread the Clutch Plate and Hub Assembly Remover,
J 9401, into the hub. Hold the body of the tool with a wrench
and turn the center screw into the remover body to remove
the clutch plate and hub assembly (Fig. 1B-100).
4. Remove the shaft key.
Replace
1. Install the shaft key into the hub key groove (Fig.
1B-101). Allow the key to project approximately 3/16" out
of the keyway.
The shaft key is curved slightly to provide an
interference fit in the shaft key groove to permit the key
projection without falling out.
2. Be sure the frictional surface of the clutch plate and
the clutch rotor are clean before installing the clutch plate
and hub assembly.
3. Align the shaft key with the shaft keyway and
assemble the clutch plate and hub assembly on the
compressor shaft.
CAUTION: To avoid intemaf damage to the
compressor, do not d i v e or pound on the clutch
hub or shaft.
4. Place Spacer Bearing, J 9480-2, on hub, insert the end
of Clutch Plate and Hub Assembly Installer, J 9480-1,
through the spacer and thread the tool onto the end of the
compressor shaft (Fig. 1B- 102).
5. Hold the hex portion of the J 9480-1 body with a
wrench and tighten the center screw to press the hub onto
the shaft until there is a .020-.040 inch air gap between the
frictional surfaces of the clutch plate and clutch rotor.
6. Install a new shaft nut with the small diameter boss
of the nut against the crankshaft shoulder, using Thin Wall
Socket, J 9399. Hold the clutch plate and hub assembly with
Clutch Hub Holding Tool, J 25030, and tighten to 8- 12 foot
pounds torque, using a 0-25 pounds torque wrench.
7. If operation is performed with compressor on car,
connect drive belt, tighten mounting brackets and adjust belt
tension. If operation is performed on bench, install
compressor. Evacuate and charge system according to
procedure.
R-4 COMPRESSOR CLUTCH ROTOR
AND/OR BEARING
Remove
1. Remove the clutch plate and hub assembly as
described in "R-4 Compressor Clutch Plate & Hub Asm."
Removal procedure.
2. Remove rotor and bearing assembly retaining ring
using Snap Ring Pliers, J 6083 (#24), Fig. 1B-103. Mark the
location of the clutch coil terminals.
If the clutch rotor and/or rotor bearing only are to be
replaced, bend the lockwashers away from the pulley rim
mounting screws (see Fig. 1B-104), and remove the six
mounting screws and special lock washers before proceeding
with Step 3. Discard the lock washers.
3. Install Rotor and Bearing Puller, J 2503 1-2, down into
the rotor until the Puller arms engage the recessed edge of
the rotor hub. Hold the Puller and arms in place and tighten
the Puller screw against the Puller Guide to remove the
clutch rotor and bearing assembly (Fig. 1B-105), being
careful not to drop the Puller guide.
If the pulley rim mounting screws and washers were
removed in Step 2, only the clutch rotor and bearing assembly
will be removed for replacement. The clutch coil and housing
assembly is pressed onto the front head of the compressor
with a press fit and will not be removed unless the pulley rim
mounting screws are left securely in place and the pulley rim
pulls the coil and housing assembly off with the total clutch
rotor and pulley rim assembly.
5. Place the rotor and bearing assembly on blocks as
shown in Fig. 1B-106. Drive the bearing out of the rotor hub
with Rotor Bearing Remover, J 25029.
It is not necessary to remove the staking at the rear of
the rotor hub to remove the bearing (see Fig. 1B-107).
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