Pontiac FIREBIRD 1972 Service Manual page 139

1 A-80 1972 PONTIAC SERVICE MANUAL
Fig. 1A-89 Measuring For Proper Shoe
a. Use J 9661 gauge set, selecting a suitable feeler
gauge leaf to result in a 4 to 8 oz. pull on the scale
between ball and swash plate (Fig. 1A-89). If the
pull is just less than 4 ozs., add .0005" to the
thickness of the feeler stock used to measure the
clearance. If the pull on the scale reads just over
8 ozs., then subtract .0005" from the thickness of
the feeler stock. Select a shoe accordingly.
b. Rotate the shaft approximately 120" and make a
second check with feeler gauge between same ball
and plate.
c. Rotate shaft again approximately 120" and repeat
check with feeler gauge between these same parts.
d. From this total of three checks between the same
ball and swash d a t e at 120" increments on swash
plate for each piston, use the minimum gauge
reading to select a numbered shoe to correspond
to this reading (Fig. 1A-90).
A selection will be made from shoe packages
shown in Fig. 1A-91, which will provide a .0005"
to .OOIOn total clearance between shoes and the
swash plate at the tightest point throughout its
360" rotation. The reading or resultant reading
will correspond to the last three numbers of the
part number of the part to be used.
RUNNING CLEARANCE
,0003"-,001 3"
MEASURED WlTH
DlAL INDICATOR
CHECKING FOR
REAR THRUST
AND RACE
THICKNESS
I
J-93
COA
FlXT
I
SELECT SHOE OF SAME
9 7 NUMBER AS OILED
APRESSING
FEELER STRIP REMOVED
URE
WITH 4 TO
8
OZ. PULL
O N DlAL INDICATOR
Fig. 1 A - 9 0 Measuring Service Shoes and Thrust Races
Once proper selection of shoes has been made, it
is imperative that the matched combination of
shoe to ball and spherical cavity in the piston be
kept intact during disassembly after gauging op-
eration and final reassembly of mechanism. The
parts tray (J 9402) with individual compartments
for each component of the mechanism will keep
parts in their proper relationship.
e. Mark piston number (1, 2 or 3) on shoe package.
f. Place shoes in J 9402 assembly tray in compart-
ment corresponding to piston number and rear
ball pocket position.
g. Repeat in detail the same gauging procedure for
each of the other two pistons.
15. The next gauging operation is to determine space
between REAR thrust bearing and upper or outer-
rear thrust race. Check compressor shaft end play as
follows (Fig. 1A-92):
I
SHOE DISC
I
THRUST BEARING RACE
I
PART NO. ENDING IN
I
IDENTIFICATION STAMP
I
PART NO. ENDINC IN
1
IOENTIFICATION STAMP
Fig. 1A-91 Available Service Shoes and Thrust Races