GMC 1990 Light Truck Repair Manual page 38

1B1-18 A-6 AIR CONDITIONING COMPRESSOR
27. Race 35. Seat
28. Bearing 40. Race
34. Ball 41. Bearing
Figure 40—Installing No. 1 Piston
Figure 41—Installing the Discharge Crossover
Tube
42. Cylinder (Rear)
46. Plate
F1626
Figure
42—
• Lubricate all the moving parts with clean 525
viscosity refrigerant oil.
• Check for free rotation.
8. Suction cross-over cover (46) (figure 42).
• Remove J 9397.
• Compress the cover (46) to start it into the slot.
• Press or top the cover (46) until the ends are
flush.
9. Seal 925) and bushing (24) to the front end of the
discharge cross-over tube (26) (figure 43).
• Place the internal assembly on J 21352.
10. Dowel pins (20) to the front head (figure 44).
11. Front suction reed plate (19) to the front cylinder
half (29) (figure 44).
• Align the dowel pins (20), suction ports, oil
return slot and discharge cross-over tube (26).
12. Front discharge valve plate (18) (figure 45).
• Align the holes with the dowel pins (20) and
the openings in the front suction reed plate
(18). The front discharge plate (18) has a large
hole in the center.
13. Front head (16) (figure 46).
• Coat the sealing surfaces on the webs of the
compressor front head casting with clean 525
viscosity refrigerant oil.
• Determine the position of the front head (16) in
relation to the dowel pins (20).
F1627
• Mark the position of the dowel pins (20) on the
sides of the front head (16) and on the sides of
the internal assembly with a grease pencil.
• Lower the front head (16).
Installing the Suction Crossover Tube
Plate
F1628