GMC 1989 Light Duty Truck Repair Manual page 55

A. P la s tic H eaded H a m m e r
W ood B lo c k
B.
F ro n t Head
33.
43. Rear Head
Figure 25—Tapping the Front or Rear Head Free
of the Cylinder
Rear head (43), head gasket (42), rear valve plate
(41), suction reed plate (40) and cylinder-to-rear head
seal (39).
• Using a wood block, tap around the edge of the
rear head to remove (figure 25).
+ 4 -
Install or Connect (Figures 3, 26 and 27)
Tools Required:
J 9625-A Pressure Test Set with Schrader Valve
J 34993 Cylinder Alignm ent Rods
J 21352-A Support Block
Use new seals and gaskets.
Place the rear head on J 35372 with the control valve
(5) at the 6 o 'clock position.
1.
Cylinder Alignm ent Rods J 34993 in the m ounting
holes at the 5 and 11 o-clock positions (figure 26).
V5 AIR CONDITIONING COMPRESSOR 1B 2 -1 1
43. Rear Head
F-04572
A. O pening to Rear S uction Port
(12 O 'C lock Position A sse m bly R eference)
B. T hrough Bolt Hole (6)
C. Suction P ressure (O utside C avity)
D. D ischarge Pressure (Inner C avity)
E. O pening to R ear D ischarge Port
F. High Pressure R elief Valve
G. Drilled O pening into High
Pressure R elief Valve A rea
Figure 26— Positioning the J 34993 Guide Pins
Figure 2 7 — Installing th e R ear H ead G asket
F-06460