GMC 1989 Light Duty Truck Repair Manual page 98

1B5-4 SD-709 AIR CONDITIONING COMPRESSOR
• Turn the puller center bolt to the right with a
socket wrench until the rotor pulley is free (fig­
ure 7).
6. Rotor bearing.
• Remove the snap ring from the rotor.
• Place the rotor in a vise.
• Install J 37795 and J 29886.
• Tap the bearing (6) out (figure 8).
7. Field coil (10).
• Loosen the coil lead wire from the clip on top of
the compressor front housing.
• Remove the snap ring (7) (figure 9).
• Remove the coil.
SHAFT SEAL
Always replace the shaft seal assembly if it is disassem ­
bled. Never reuse any of the old parts.
To service the shaft seal w ithout disassem bling the
clutch, perform steps 1 and 2 under " C lutch" and then
proceed as follows.
Remove or Disconnect (Figures 2 and 10 through
12)
Tools Required:
J 9553-01 O-Ring Hook
J 37793 Seal Seat Rem over/Installer
J 37794 Shaft Seal Remover and Installer
.
Clutch shims (3) using J 9553-01 and a small screw­
1
driver.
2
. Felt ring metal retainer (25).
• Insert the points of a snap ring pliers into the
holes in the retainer and lift out (figure 10).
Shaft seal seat snap ring.
Shaft seal seat (23) with J 37793 (figure 11).
Seal assembly.
• Press J 37794 against the seal spring and twist
the tool until it engages the slots of the seal
cage (figure 12).
Figure 9— Removing the Coil Snap Ring
ASSEMBLY OF THE
CLUTCH AND
SHAFT SEAL
SHAFT SEAL
4 Install or Connect (Figures 2,11 and 13)
- ► -
Tools Required:
J 29640 Shaft Protector
J 37794 Shaft Seal Remover and Installer
J 37793 Seal Seat Rem over/Installer
Clean
Seal cavity thoroughly.
a. Use R-12 refrigerant. Blow dry.
b. Wipe with a lint free cloth and clean refrigerant
oil. Blow dry.
1. J 29640 over the compressor shaft.
• Do not touch the new seal lapping surfaces. Dip
the mating surfaces in clean refrigerant oil.
Slots of J 37794 to the new seal cage (21).
Seal assembly into place in the com pressor seal cav­
ity (figure 13).
• Twist J 37794 to disengage it from the cage.
Clean refrigerant oil to the shaft seal seat.
Shaft seal seat (23) with J 37793 (figure 11).
Snap ring with the flat side toward the compressor.
Clutch spacer shims (3).
Use the originals if possible to give the same gap.
New felt ring.
• If the clutch was not disassem bled, reinstall the
clutch front plate.
CLUTCH
Install or Connect (Figures 2 ,3 ,1 4 and 15)
Tools Required:
J 37795 Bearing Remover and Installer/Pulley
Installer