GMC 1982 Light Duty Truck Service Manual page 107

1) No Inertia Ring installed; no installation is required unless
directed by a diagnostic procedure. If a ring is to be added,
use Procedure I.
2) Bolted - on Inertia Ring is installed; replace using Procedure
I. All new screws, washers, and Loctite 601 (or equivalent)
must be used.
3) Welded - on Inertia Ring is installed; replace using Procedure
II.
Procedure I
1. Loosen the compressor drive belt and rotate the compressor
pulley as required to locate one (1) screw and lock washer
mounted through a "mounting hole" of the Pulley Rim,
Figure 1C 1-24, rather than a "mounting notch" screw
location. Do not remove the drive belt unless necessary. For
identification purposes, washers locked over the edge of the
Pulley Rim at the "mounting hole" locations will not usually
dimple down in the center like the indentation of the lockover
at a "mounting notch" screw location.
2. Remove the three (3) mounting screws and lockwashers at
the pulley rim "mounting hole" locations. (The pulley rim
"mounting holes" are located 120° apart radially around the
rim or every other mounting screw location.) Do not remove
the screws in the "mounting notches."
3. Temporarily make a trial fit of the Inertia Ring to the Pulley
Rim. If any portion of the sheer edge of the Pulley Rim
prevents the installation of the Inertia Ring, the raised edge
may be filed off to remove the excess metal and facilitate
installation. Do not use undue force or cock the ring in
assembling the Inertia Ring in place over the Pulley Rim that
could cause ring distortion or stress.
4. Assemble the Inertia Ring onto the Pulley Rim, being careful
to align the inertia ring mounting holes with the mounting
holes in the pulley rim. If the Inertia Ring must be rotated
on the Pulley Rim for centering the mounting holes and
cannot be shifted by hand, use a drift punch or blunt tool and
a hammer to carefully tap the Inertia Ring at a clearance
notch, Figure 1C1-25, to move the ring into position.
5. Install a special lockwasher onto each 6.4mm-28 x 13.5mm
(l/4"-28 X 17/32") mounting screw.
6. Apply Loctite 601 (or equivalent sealer) to the screw threads
of each mounting screw and threads of the mounting holes
in the Clutch Rotor. Wet the threads thoroughly to ensure
complete thread coverage.
7. Install the screws into the mounting holes and tighten finger-
tight. Torque each screw to 11 N-m (100 in. lbs.) torque.
AIR C O N D ITIO N IN G COMPRESSOR OVERHAUL 1C1-9
~1~| C L E A R A N C E N O T C H
"T 1 " L O C K " W A S H E R T O S I D E S O F S C R E W
------ H E A D A N D D O W N O V E R N O T C H IN R I N G .
(3 " M O U N T I N G H O L E " L O C A T I O N S )
[ T l " L O C K " W A S H E R T O S I D E S O F S C R E W
------ H E A D A N D D O W N O V E R E D G E O F P U L L E Y
R I M . (3 " M O U N T I N G N O T C H " L O C A T I O N S )
|~4~| P U L L E Y R I M
8. Lock the three (3) screws in place by flattening the special
washer against two sides of the hex head screw using vise grip
pliers and one portion of the lockwasher bent down over the
edge of the inertia ring slot, Fig. 1C1-25. Do not move the
screw heads from the torqued position. Locking of the screws
must be similar to the production forming of the lockwasher
in order to effectively retain the screw.
9. Retighten the compressor drive belt to proper belt tension.
10. Check compressor and system operation.
• If "mounting notch" screws must be replaced for any
reason, the screws should be torqued into place 11 N • m
(100 in. lbs.) torque using Loctite 601 (or equivalent
sealer) on the threads and locked into place similar to
the original locking method.
Procedure II
INERTIA RING AND PULLEY RIM WELDED ASSEMBLY
- REPLACEMENT
(NEW PULLEY RIM AND INERTIA RING KIT REQUIRED)
1. Loosen the compressor mounting bracket and remove the
compressor drive belt.
2. Remove the Clutch Hub and Drive Plate assembly as
described in "R-4 Compressor Clutch Plate and Hub Asm."
Removal procedure.
3. To remove as an assembly, perform Steps 1 through 4 of "R-4
Compressor Clutch Rotor and/or Bearing" Removal
procedures but do not loosen or remove the pulley rim
mounting screws, so as to remove the Clutch Rotor and
Bearing, Clutch Coil, Pulley Rim and Inertia Ring as a total
assembly. Be careful not to drop the Puller Guide J 25031
when removing the assembly.
4. Remove all six (6) pulley rim mounting screws and
lockwashers from the assembly and discard.
5. Separate the Pulley Rim and Inertia Ring assembly away
from the Rotor and Bearing assembly.