GMC 1990 Light Truck Repair Manual page 33

40
J 9397
J
29. Cylinder (Front)
40. Race
41. Bearing
Figure 28—Installing the Rear Thrust Races and
Bearing
Figure 29—Installing the Front Shoe Disc
7. Place the balls (34) into the sockets of number
one piston (figure 29).
• Lubricate the ball sockets with 525 viscosity
refrigerant oil.
8. Place the shoe discs (35) over the ball (34) in the
front end of the piston.
• Lubricate the cavity of the shoe disc with 525
refrigerant oil.
• The front end of the piston (32) has an identify­
ing notch in the casting web.
A-6 AIR CONDITIONING COMPRESSOR
G. Piston drive ball and a
29. Front cylinder half.
F1595
Figure 30—Installing the Piston during the Gaging
Rotate the shaft and axial plate (39) until the high
point of the axial plate is over the No. 1 piston
cylinder bore.
10. Lift the axial shaft assembly (39) up a little out of
front cylinder half (29).
Position the No. 1 piston (32) over the No. 1 cylin­
11.
der bore (notched end of the piston being on the
bottom and the piston straddling the axial plate)
and lower the shaft to allow No. 1 piston to drop
into its bore (figure 30).
12. Repeat step 11 for pistons Nos. 2 and 3.
13.
aligning the cylinder with the discharge cross-over
tube hole in the front cylinder.
14. Position the discharge cross-over tube opening
between a pair of compressing fixture bolts to per­
mit access for the feeler gage.
15.
F. Piston drive ball at the rear.
"zero" shoe disc at the front.
Operation
Important
• Do not install the shoe discs (35) on the
rear of the piston (32).
• Hold the front thrust races and bearing ("zero"
race, race bearing, "zero" race) against the
axial plate hub.
Install the rear cylinder half (42) on the pistons,
• Tap the piston into place using a plastic mallet
or piece of clean wood and a hammer (figure
31).
Install the top plate to J 9397.
Tighten
Nuts to 20 N m (15 ft. lbs.).
1B1-13
F1597