GMC 1982 Light Duty Truck Service Manual page 136

ID -2 0 AIR CONDITIONING COMPRESSOR OVERHAUL
PISTON AND
RING ASSEMBLY
Fig. 1D-48 Turning A-6 Piston and Ring Asm. Into Ring Sizing
PISTON AND RING ASSEMBLY
NOTCHED END
J-24608-1 PISTON RING GAGE
■ B H H H I H a H
Fig. 1D-49 Gaging A-6 Piston Ring Size
TEFLON RING
Fig. 1D-50 A-6 Teflon Piston Ring Installed in Piston Groove
c. Insert the Piston Assembly into the F ro n t Cylinder
H alf (Fig. ID-51).
4. R epeat this operation for Pistons No. 2 and No. 3
(Fig. ID-52).
5. W ithout installing any O-rings or bushings, assemble
one end of the new Service D ischarge Cross-Over Tube into
the hole in the front cylinder half (Figs. ID-53 and ID-54).
Be sure the flattened p ortion of this tube faces the inside
of the com pressor to allow for axial plate clearance (Fig.
ID-54).
6. Now rotate the shaft to position the pistons in a
stair-step arrangem ent; then carefully place the R ear
Cylinder H alf over the shaft and start the pistons into the
cylinder bore (Fig. ID-55).
J -24608-6 RING
SIZING TOOL
204985
Tool
20498I
200919
"S E L E C T E D "
m
R E A R SHOE D IS q
" Z E R O " F R O N T
SHOE DISC
^ 4
Fig. 1D-51 Installing 1st A-6 Piston Assembly Into Front
Cylinder Half
BALL AND S H O E ||
FRONT AND REAR
FRONT THRUST RACES AND BEARING
Fig. 1D-52 Installing 2nd A-6 Piston
7. W hen all three Piston and Ring assemblies are in
their respective cylinders, align the end o f the discharge
cross-over tube with the hole in the rear half of the cylinder.
8. W hen all parts are in proper alignment, tap with a
clean wooden block and m allet to seat the rear half of the
cylinder over the locating dowel pins. If necessary, clamp
the cylinder in Com pressing Fixture J 9397, to complete
drawing the cylinder halves together.
9. G enerously lubricate all moving parts w ith clean 525
viscosity refrigerant oil and check for free rotation of the
parts.
"S E L E C T E D "
R E A R T H R U S T R AC E
T H R U S T B E A R IN G
r Z E R O " T H R U S T
RAC ES L IF T
S H A F T U PW A R D
A N D H O L D TH E
T H R U S T RACES
(A N D B E A R IN G
j A G A IN S T H UB
lO F A X lA L jjR p
I P L A T E . M T
[T H R U S T B E A R IN G 1
200920
REAR THRUST RACES
AND BEARING
A X IA L PLATE
200921