GMC 1989 Light Duty Truck, Repair Manual, Page: 33 / 998

A-6 AIR CONDITIONING COMPRESSOR 1B1-15
fe e le r g a g e is sliding out (figu re 32 ). T h e
reading should be b etw een 1.1 and 2 .2 N (4
and
8
ounces).
d. If the reading in step c ab o ve is und er 1.1 N (4
ounces) or over 2 .2 N
(8
ounces), redu ce or
in c re a s e th e th ic k n e s s of th e fe e le r g a g e
leaves and repeat steps a through c to obtain
a reading of 1.1 N to 2 .2 N (4 to
8
ounces).
Record the cle a ra n c e b etw een th e ball and
axial plate th at results in th e 1.1 N to 2 .2 N (4
to
8
ounces) pull on th e spring scale.
2. R otate the shaft 120 d e g re e s and repeat for the No.
2
cylinder.
• If the shaft is hard to rotate, install th e shaft
nut onto the shaft and turn the shaft with a
w rench.
3. Rotate th e shaft an o th er 120 d e g re e s and rep eat for
cylinder No. 3.
4. S elect a n um bered shoe disc co rresponding to the
m inim um fee le r g ag e reading recorded in th e th ree
checks:
POSITION POSITION POSITION SELECT
1 2 3 AND USE
SHOE NO.
PISTON NO. 1 .0 1 9 " .0 1 9 5 " .0 1 9 " 19
PISTON NO. 2
.0 2 0 "
.0 2 0 "
.0 2 0 " 20
PISTON NO. 3 .0 2 1 " .0 2 1 " .0 2 2 " 21
SHOE DISC
Part No.
Identification Min. Feeler
Ending In Stamp
Gage Reading
000 0
.0000
175
171/2 .0175
180
18 .0180
185 I
8
V
2
.0185
190 19
.0190
195
191/2
.0195
200 20 .0200
205
201/2
.0205
210
21 .0210
215
21
V
2
.0215
220
22 .0220
THRUST BEARING RACE
Part No. Identification Dial Indicator
Ending In Stamp
Reading
000 0 .0000
050
5 .0050
055
51/2
.0055
060
6
.0060
065
6 V 2
.0065
070 7 .0070
075 7
1/2
.0075
080
8
.0080
085
8 V 2
.0085
090 9 .0090
095
91/2
.0095
100 10 .0100
105
IOV
2
.0105
110
11
.0110
115
111/2
.0115
120
12
.0120
F-01398
Figure 33— Service Shoes and Thrust Washers
• P lace th e shoe discs in J 9 4 0 2 co m p artm e n t
with th e discs co rresponding to piston No. 1
and the rear ball pocket position.
• S h o e d is c s a r e a v a i l a b le in 0 .0 1 3 m m
(0 .0 0 0 5 -in c h ) v a ria tio n s . E le v e n s iz e s a re
av ailab le for field servicing. S h o e discs are
m arked with the shoe size which co rresponds
to the last th ree digits of the part n u m b er
(figure 33).
• A fter selecting th e shoe size, th e m atch ed
co m b inatio n of the shoe disc to the rear ball
spherical cavity in the piston m ust be kept in
th e p ro p er re lation sh ip d u rin g d is a s s e m b ly
after perform ing the gaging operation and the
final assem b ly of the internal m ech an ism .
5. R e p e a t the gaging p rocedure for pistons Nos. 2 and
3.
6
. M ount a dial indicator on the e d g e of J 9 3 9 7 with
J 8001.
7. Position the dial indicator on the rear of the shaft
(39) and adjust to zero (figure 34).