GMC 1990 Light Truck Repair Manual page 90

1B4-14 HR-6 AIR CONDITIONING COMPRESSOR
A. 12 o'clo c k Reference Position
B. T ips o f S uction Reeds M ust Lo­
cate Above Recess in C ylinder at
Top
C. Discharge C rossover Opening
15. C ylinder Seal (Front)
Figure 36 — Installing the Front Suction
Reed Plate
Important
• Front head (11) is now assembled in the " stand­
ard" position and may differ 120 degrees either
direction. Assemble front head (11) according
to location marked before removal.
• Using both hands, press down on front head
(11) for installation over the seal (15) at the front
of the cylinder (16).
12. Through bolts (7) with new gaskets.
• Thread four of the through bolts (7) into the rear
head (28) before removing J 33016 guide pins.
Install two remaining through bolts (7) finger
tight.
• Mount the compressor on J 33026 (figure 39).
Tighten
$
• Six through bolts (7) alternately to 9 N m (84 in.
lbs.).
13. Shaft seal parts (8,9,10).
Important
Add new 525 viscosity refrigerant oil.
Refer to vehicle service manual for fill quantity.
Place shaft nut (1) on the shaft (20) and rotate
the compressor shaft (20) several times and
remove nut (1).
52-A
B-06735
A. 12 o'clo ck Reference P osition
B. Head Gasket
Figure 38 — Installing the Seal to the Front Head
A
B
•A
B-06812