GMC 1982 Light Duty Truck Service Manual page 120

1D-4 AIR CONDITIONING COMPRESSOR OVERHAUL
CLUTCH ASSEMBLY
HOLDING
FIXTURE
J-9396
Fig. 1D-3 Removing A-6 Shaft Lock Nut
A CLUTCH PLATE
* * & HUB
Fig. 1D-4 Removing A-6 Clutch Plate and Hub Asm.
If the frictional surface shows signs o f dam age due to
excessive heat, the C lutch Plate and H ub and Pulley and
Bearing should be replaced.
underlying cause of the dam age (i.e. low coil voltage, coil
should draw 3.2 am ps at 12 volts) binding of the com pressor
internal m echanism (cylinder and shaft assembly), clutch air
gap too wide (see Fig. ID -8), broken drive plate to hub asm.
springs, etc.
Replace
1. Insert the square drive key into the hub of driven
plate; allow it to project approxim ately 4.8mm (3 /1 6 ") out
of the keyway. The key has a slight curve for interference
fit into hub keyway.
2. Line up the key in the hub with keyway in the shaft
(Fig. ID-6).
3. Install the D rive Plate Installer J 9480-1 as
illustrated. This Installer has a left hand thread on the body
(Fig. ID-7).
4. Press the driven plate onto the shaft until there is
approxim ately 2.4mm (3 /3 2 ") space between the frictional
THINWALL
SOCKET
J-9399
CLUTCH HUB
HOLDING TOOL
J-25030 OR
J-9403
204970
CLUTCH PLATE
& HUB A SM
REMOVER
J-9401
Check further for the
SCORING OF DRIVE AND DRIVEN PLATES IS NORMAL.
DO NOT FOR THIS CONDITION.
REPLA C E
DRIVEN PLATE
DRIVE PLATE
Fig. 1D-5 A-6 Clutch Driven Plate and Drive Plate
HOLDING FIXTURE
J
Fig. 1D-6 Aligning A-6 Drive Plate Key
faces of the C lutch Drive Plate and Pulley. M ake certain
key rem ains in place when pressing hub on shaft.
A zero thrust race is approxim ately 2.4mm (3/32 ")
thick and m ay be used to roughly gage this operation. Use
C lutch H ub H older J 25030 or J 9403 to hold C lutch Plate
and H ub if necessary.
6. Using Thin-W all Socket J 9399 and C lutch H ub
H older J 25030 or J 9403 to install a new shaft locknut.
Tighten the nut to 19 to 35 N *m (14-26 lb.ft.) torque. A ir
gap between the frictional faces should now be .6 to 1.4mm
(.022" to .057") (Fig. ID-8). If not, check for m ispositioned
key or shaft.
205038
KEYW AY
SHAFT
5073