GMC 1990 Light Truck Repair Manual page 40

1B1-20 A-6 AIR CONDITIONING COMPRESSOR
16. Front Head
17. Seal
Figure 47—Installing the Front Head Seal
Important
• Do not let the sealing area around the cen­
ter bore of the head touch the shaft as the
head is lowered.
• Do not rotate the front head (16) to line up
with the dowel pins because this will con­
tact the reed container.
14. Seal (17) to the front head (16) (figure 47).
• Lubricate the seal (17) and groove with clean
525 viscosity refrigerant oil.
15. Shell (9) to the internal assembly (figure 48).
• Coat the inside of the shell (9) with clean 525
viscosity refrigerant oil.
• Position the shell (9) on the internal assembly.
Rest the shell (9) on the seal.
• With the flat side of a small screwdriver, posi­
tion the seal (17) in a round, circle shape to
the inside of the shell (9).
• Slide the shell (9) down. Line up the oil sump
with the oil intake tube hole.
16. New dowel pins (20) to the rear cylinder half.
• Remove J 21352.
• Install the compressor into J 9396.
17. Seal (43) to oil pick-up tube (44).
18. Oil pick-up tube (44) to the compressor (figure 49).
• Lubricate the oil pick-up tube (44) with clean
525 viscosity refrigerant oil.
• Place the oil pick-up tube (44) in the cavity.
• Rotate the compressor assembly to align the
tube (44) with the hole in the shell baffle.
19. Seal (31) and bushing (30) to the rear of the dis­
charge cross-over tube (26).
F1635
L. Oil Sump
Area
M. Oil Intake
Tube Hole
9. Shell
17. Seal
48
Figure
20. Rear suction reed (48) over the dowel pins (45).
• Place the slot toward the sump.
21. Rear discharge valve plate (49) over the dowel
pins (45).
• Place the reed retainer up.
22. Inner oil pump gar (50) over the shaft (39).
• Line up the identification marks.
23. Outer oil pump gear (51) over the inner gear (fig­
ure 50).
• Line up the identification marks.
• Face the compressor oil sump and position the
outer gear (51) so that it meshes with the inner
gear (50) at the 9 o'clock position. The cavity
between the gear teeth will be at the 3 o'clock
position.
24. Seal (52) to the discharge valve plate (49).
• Lubricate the seal (52), shell (9), discharge
plate (49) and gears (50 and 51) with 525 vis­
cosity refrigerant oil.
25. Suction screen (58) to the rear head (54).
• Lubricate the surface of the rear head (54) with
525 viscosity refrigerant oil.
— Installing the compressor Shell
F1393