GMC 1990 Light Truck Repair Manual page 31

Figure 23— Numbering the Pistons and Cylinders
| 2 | Important
• To prevent damaging the shaft, do not tap
on the end of the compressor shaft to
remove the internal mechanism. If the
mechanism will not slide out of the com­
pressor shell, tap on the front head with a
plastic hammer.
11. Front head assembly (16) from the shell (9).
• Rest the compressor shell (9) on its side and
push the fronthead assembly (16) through the
shell (9).
A-6 AIR CONDITIONING COMPRESSOR
29. Front Cylinder Half
42. Rear Cylinder Half
66. Wood Block
12. Front seal (17).
13. Front discharge valve plate (18).
14. Front suction reed plate (19).
15. Suction cross-over plate (46) (figure 22).
16. Cylinder halves (29 and 42).
17. Rear half (42) of the compressor from the pistons
(30).
18. Front cylinder half (29) with the piston (38), shaft
and axial plate (38) to J 9397.
19. Pistons (30), balls (31) and seats (33) in the order
in which the pistons are marked.
20. Rear thrust races (40) and thrust bearing (41) from
the shaft (39) (figure 26).
21. Shaft (39) from the front cylinder half (29).
22. Front thrust races (27) and thrust bearing (28).
23. Discharge crossover tube (26) from the cylinder
half (29) with locking jaw pliers.
— This is necessary on original factory equipment
24
Figure — Separating the Cylinder Halves
• Tap on the outside of the front head (16) with a
plastic hammer to overcome the friction of the
seal (17) between the fronthead (16) and the
shell (9).
• Pry with a screwdriver between the casting
(29) and the cover.
• Number the piston and the piston bores with
the same numbers so the pistons can be
installed in their bores (figure 23).
• Separate the cylinders (29 and 42) with a block
of wood and a mallet (figure 24).
• Do not let the discharge cross-over tube (26)
touch the axial plate (39).
• Do not strike the shaft at either end to sepa­
rate the upper and lower cylinder halves
because the shaft (39) can be damaged.
• Place parts in J 9402.
• Place the pistons (32) in J 9402 with the notch
in the casting web at the front end of the pis­
ton into the dimpled groove of the J 9402 (fig­
ure 25).
• If necessary, bend the discharge cross-over
tube (26) to remove the shaft (39).
because the tube ends are swedged into the
cylinder halves.
1B1-11
F1591