GMC 1976 ZEO 6083 Maintenance Manual page 103

1- 86 AIR CONDITIONING SYSTEM
Figure 71-Notch Identifying Front End of Piston
7. Remove and examine piston balls, and if satis-
factory for re-use, place balls in No . 1 compartment
of Parts Tray J-9402 (figure 72) .
8. Place piston in No . 1 compartment of Parts
Tray J-9402, with notch in casting web at front end
of piston (figure 71) into the dimpled groove of Parts
Tray compartment.
9 . Repeat Steps 5 through 9 for Pistons No . 2 and
No. 3.
10 . Remove rear combination of thrust races and
thrust bearing from shaft. Discard races and bearing.
11 . Remove shaft assembly from front cylinder
hald . If the discharge cross-over tube remained in the
front cylinder half, it may be necessary to bend dis
charge cross-over tube slightly in order to remove
shaft.
Figure 72-Parts Tray
12 . Remove front combination of thrust races
and bearing from shaft. Discard races and bearing.
13 . Examine surface of axial plate and shaft. Re-
place
as an assembly,
if necessary.
A certain amount of shoe disc wear on axial plate
is normal, as well as some markings indicating load
of needle bearings on shaft.
14 . Remove discharge cross-over tube from cylin-
der half, using self-clamping pliers .
This is necessary only on original factory equipment,
as
ends of the tube are swedged into cylinder halves .
The discharge cross-over tube in internal mechanism
assemblies that have been
previously
serviced have an
O-ring and bushing at EACH END of the tubee, and
can be easily removed by hand (See figure 92).
15 . Examine piston bores and needle bearings in
front and rear cylinder halves . Replace front and
rear cylinders if any cylinder bore is deeply scored or
damaged.
16 . Needle bearings may be removed if necessary
by driving them out with special Thin-Wall Socket
J-9399 . Insert socket in hub end (inner side) of cylin
der head and drive bearing out. To install needle
bearing, place cylinder half on Support Block J-
21352, and insert bearing in end of cylinder head
with bearing
identification marks UP.
Use Needle Bear-
ing Installer J-9432 and drive bearing into cylinder
head (figure 74), until tool bottoms on the cylinder
face .
Two different width needle bearings are used in
Production compressors - a 1/2" size and a 5/8"
size .
The bearings ARE interchangeable.
Service replace-
ment bearings are all 1/2" .
Figure 73-Removing Front Thrust Races and
Bearings