Pontiac FIREBIRD 1972 Service Manual page 129

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A-7n
1972 PONTIAC SERVICE MANUAL
4. Remove hub and drive plate assembly key from shaft.
REPLACE:
Insert square drive key into shaft so that it projects
approximately 3/16" out of end of keyway (Fig. 1A-
64). Wedge into keyway with blunt tool.
Line up keyway in hub with key way in shaft.
CAUTION: To avoid internal damage to the
compressor, DO NOT drive or pound on hub
and drive plate assembly or on end of shaft. I f
proper tools to remove and replace clutch parts
are not used, it is possible to disturb the posi-
tion of the swash plate (keyed to main shaft)
resulting in compressor damage.
Position hub and drive plate assembly into compres-
sor front end casting.
Place J 9480-2 "free" spacer on hub and drive plate
assembly and screw the J 9480-1 drive plate installing
tool on threaded end of compressor shaft approxi-
mately three full turns (to prevent tool from forcing
key out of keyway). Make certain key remains in
place when pressing hub on shaft.
Using wrench on end of tool body and another
wrench on hex nut, tighten nut to press hub and drive
plate assembly onto shaft approximately 1/4".
Remove tool and look into armature plate hub to
make certain key remains in place.
Install J 9480-01 and press until there is approxi-
mately .002"-.057" (1/32"-1/16") space between the
frictional faces on pulley and drive plate (Fig. 1A-65).
Remove J 9480-01 assembly.
Install hub spacer washer.
Install hub and drive plate assembly retainer ring
with flat side of ring facing spacer, using J 5403 (No.
21 pliers). J 9399 can be used to "snap" retainer ring
in place.
Install a new armature plate and hub lock nut, using
J 9399 (special thin wall 9/16" socket). Tighten to 15
lb. ft. torque. The air gap between the friction faces
of pulley and drive plate should now be between
.002" to .057" (1/32" to 1/16") clearance.
Operate engine and refrigeration system with suction
pressure of at least 30 psi and discharge pressure of
at least 150 psi. Cycle clutch (by turning air condi-
tioning off and on) at least twenty times at approxi-
mately one-second intervals to "seat" or "run-in"
mating parts of clutch.
COMPRESSOR PULLEY AND/OR BEARING
ASSEMBLY
-
REMOVE A N D REPLACE
REMOVE:
1. Remove hub and drive plate assembly.
Fig. 1A-64 Proper Position of Hub and Drive Plate Key
Fig. 1A-65 Installing Hub and Drive Plate Assembly