GMC 1990 Light Truck Repair Manual page 24

1B1-4 A-6 AIR CONDITIONING COMPRESSOR
• Install J 9480-B on the threaded end of the
shaft (figure 5).
• Back off J 9480-B body to allow the center
screw to be threaded against the end of the
compressor shaft (39).
• Hold the center screw with a wrench and tight­
en the hex portion of J 9480-B body while
pressing the hub onto the shaft (39). After
tightening the body several turns, remove
J 9480-B and check that the shaft key (36) is
properly in place in the keyway.
• Air gap between contact surfaces of the clutch
plate and hub assembly (2) and the pulley (6)
should be 0.56-1.34 mm (0.022-0.057-inch).
• Remove J 9480-B.
Inspect
• Position of the shaft (39) (even with or slightly
above the clutch hub).
3. Shaft nut (1).
• Use J 9396 to hold the clutch plate and hub
assembly (2).
| ^ \ | Tighten
• Shaft nut (1) to 27 N-m (20 ft. lbs.) with J 9399.
• Hand spin the pulley (6) to check for free rota­
tion.
PULLEY AND BEARING
ASSEMBLY REPLACEMENT
«--► Remove or Disconnect (Figures 1, 6 through 9)
Tools Required:
J 6435 Snap Ring Pliers
J 8092 Driver Handle
J 8433 Heavy Duty Pulley Puller
J 9395 Pulley Puller Adapter
J 9398-A Pulley Bearing Remover
J 9481-A Pulley Bearing and Pulley Installer
J 24092 Pulley Hub Adapter Set
1. Clutch plate and hub assembly (2).
2. Pulley bearing retainer (2) with J 6435 (figure 6).
3. Pulley (6).
• Install J 9395 over the end of the compressor
shaft (38) (figure 7).
Important
• Use J 9395 puller pilot to prevent internal
damage to the compressor when removing
the pulley. Do not use the pulley directly
against the end of the shaft.
• Place J 8433 over J 9395 for the regular V-
groove pulley.
• Place J 24092 over J 9395 for the multi-groove
pulley.