Pontiac tempest 1968 Service Manual page 51

1A-24 1968 P O N T I A C SERVICE MANUAL
F i g . 1 A - 3 5 Checking Compressor Mainshaft End Play
NOTE: Apply full hand force at end of mainshaft a
few times before reading clearance. This will help
squeeze the oil out from between mating parts.
a An alternate method of selecting a proper
race is to use J 9661 gauge set selecting a suitable
feeler gauge leaf until the result is a 4 to 8 oz. pull
on the scale between the rear thrust bearing and
upper (or outer rear) thrust race (Fig. 1A-36). If
the pull is just less than 4 ozs., add . 0 0 0 5 " to the
thickness of the feeler stock used to measure
the clearance. If the pull on the scale reads just
F i g . 1 A - 3 6 Measuring for Proper Thrust Race
over 8 ozs., then subtract .0005" from the thick­
ness of the feeler stock. Select a race accordingly.
d. Select from stock a numbered thrust race
that corresponds to dial indicator reading (Fig.
1A-37).
NOTE: Thrust races are made of steel and ground
to a fixed thickness. A total of fourteen thrust
races are available for field service. They will
have increments
of .0005" thickness to provide the
required clearance.
The thrust races will be identified on the part by
their thickness, and the number on thrust race will
correspond to the last three digits of the piece part
number.
If an improper selection of thrust races or shoes
is made and the tolerance is G R E A T E R than the
maximum clearance, noisy operation of the com­
pressor will result. If the tolerance is LESS than
the minimum clearance it is quite likely that the
mechanism assembly will be too tight. This may
result in galling and seizure of parts.
Therefore, it is very important that care be
used during gauging operations and the proper selec­
tion of parts be made. Once selection has been
made, be sure that they are assembled into the
correct position in the mechanism.
e. Mark the package " R E A R " thrust race or
place it in J 9402 assembly parts tray correspond­
ing to this position.
16. Loosen and remove nuts and ring from J 9397
compressing fixture.
17. Separate cylinder halves (it may be necessary
to use a fiber block and mallet).
18. Remove rear half cylinder.
19. Carefully remove one piston at a time from
swash plate and front half cylinder. Do not lose
relationship or position of front ball and shoe and
rear ball only. Transfer each piston, balls and
shoe assembly to its proper place in the J 9402
assembly tray.
20. Remove REAR outer ZERO thrust race from
shaft and replace it with numbered thrust race, de­
termined in step No. 15. Apply a LIGHT smear
of petrolatum to thrust races to aid in holding them
in place during assembly.
NOTE: This ZERO thurst race may be put aside
for re-use in additional gauging and/or rebuild
operations.
21. Apply a light smear of petrolatum to numbered
shoes and place them over correct ball in rear of
piston.