Compressor Assembly - GMC 1990 Light Truck Repair Manual

33. Ring
Figure 37—-installing the Piston Ring
• Rotate the piston and ring assembly in J 24608-6
several turns until the assembly rotates relatively
free in the ring sizer.
5. Piston (32) to J 24608-1 (figure 39).
• The piston (32) should pass through the ring
gage with a two to eight pound force.
6. Repeat for the opposite end of the piston (32).
7. Lubricate both ends of the piston (32) with 525
viscosity refrigerant oil before installing the piston
into the cylinder bore.
A-6 AIR CONDITIONING COMPRESSOR
J 24608-5
33
24608-2

COMPRESSOR ASSEMBLY

Assemble the cylinder assembly after performing the
" Gaging Procedure," choosing the correct shoe discs
and thrust races and installing any piston rings. Install
new seals supplied in the service kit.
4-+ Remove or Disconnect (Figures 1, 40 through
F1623
• Support the front half of the cylinder (29) on
1. Shaft and axial plate (38).
2. Balls (32) and shoe discs (33) to the pistons (30).
3.
4.
5.
6. Discharge cross-over tubes (26) into the rear half
7. Rear cylinder half (42) over the locating dowel
51)
J 9397.
• Place the shaft, threaded-end down, with the
front bearing race pack (race and bearing) into
the cylinder if this was not done at the end of
the "Gaging Procedure."
• Apply a coat of petroleum jelly to the " num­
bered" shoe discs.
Piston assembly (30) into the front cylinder half
(29) (figure 40).
• Rotate the axial plate (39) to place the high
point above cylinder bore No. 1.
• Hold the front thrust bearing pack against the
axial plate hub.
• Repeat for pistons Nos. 2 and 3.
Discharge the cross-over tube (26) (figure 41).
• Face the flattened portion of the tube to the
inside of the compressor to allow for axial plate
clearance.
Rear cylinder half (42) over the shaft (39).
• Rotate the shaft (39) to position the pistons in
a stair-step arrangement.
• Start the pistons into the cylinder bores.
of the cylinder (29).
pins (45).
• After aligning, tap the rear half of the cylinder
with a mallet and wood block.
• If necessary, clamp the cylinder in J9397 to
draw the halves together.
1B1-17