Buick LeSabre 1965 Service Manual page 494

8 - 3 0 POWER STEERING
STEERING GEAR, STEERING COLUMNS AND LINKAGE
Figure 8-32—Adjusting Thrust
Bearing Preload
pounds higher than was obtained
in Step 7. Adjust pitman shaft
lash adjuster if necessary.
NOTE: Total overcenter torque
should not exceed 18 inch pounds.
b. Adjustment of Power
Steering Gear Out of Car
1. This adjustment is made when
the gear is completely assembled
and with gear on bench.
2. Loosen adjuster plug locknut
and back off adjuster plug ap-
proximately 1/8 turn with adjust-
able Spanner Wrench J-7624.
Attach Torque Wrench J-58 53 with
3/4 inch 12 point socket to stub
shaft and turn shaft to approxi-
mately 1/2 turn from either ex-
treme. Slowly rotate wrench in
an arc approximately 60° (1/6
turn) in both directions several
times to measure valve drag and
record highest reading. See Fig-
ure 8-32. Then tighten adjuster
plug until thrust bearing preload
is 1 to 3 inch pounds in excess of
drag measured with adjuster jplug
backed out. Total of thrust bear-
ing preload and valve drag should
not exceed 8 inch pounds.
3. Turn stub shaft 1/2 to 3/4 of
a turn off "high-point" (center
position) of gear. Worm to rack
ball preload is checked with gear
in this position.
NOTE: It is not necessary to
back off pitman shaft lash adjust-
er to check ball preload when
gear is positioned as instructed
in Step 4.
4. Check the pull required to turn
stub shaft. The reading should be
1-1/2 to 4-1/2 inch pounds higher
than total reading obtained in
Step 3. If reading is not within
specification it will be necessary
to readjust ball preload between
worm and rack-piston nut.
5. If readings are within specifi-
cations, check and adjust if
necessary, pitman shaft "over-
center*' adjustment. Reading on
torque wrench should be 4 to 8
inch pounds higher than was ob-
tained in Step 5. See Figure 8-33.
This reading is taken when ro-
tating stub shaft through "high-
point" range with lash adjuster
nut tight. Torque required should
not exceed 18 inch pounds.
8 - 1 4 DISASSEMBLY,
INSPECTION AND
REASSEMBLY OF
ADJUSTER PLUG
ASSEMBLY AND
ROTARY VALVE
ASSEMBLY
a. Removal of Adjuster Plug
Assembly and Rotary
Valve Assembly
1. Thoroughly clean exterior of
gear assembly with a suitable
solvent. Drain the unit by placing
the valve ports down and turning
the worm through its entire range
two or three times.
2. Place gear assembly in vise.
3. Loosen adjuster plug lock nut
with Punch and remove adjuster
plug u s i n g adjustable Spanner
Wrench, J-7624.
4. Remove rotary valve assembly
from gear by grasping stub shaft
and pulling out.
NOTE: If it is only necessary to
service the rotary valve assem-
bly, proceed win subparagrapn
d below.
b. Disassembly of Adjuster
Plug Assembly
1. Remove the upper thrust bear-
ing retainer with a screwdriver,
being careful not to damage the
needle bearing bore. See Figure
8-35. Discard retainer. Remove
thrust bearing s p a c e r , upper
thrust bearing and thrust bearing
races.
2. Remove adjuster plug "O"
ring and discard.
3. Remove stub shaft seal retain-
ing ring using No. 3 Truarc
Pliers J-4245 and remove and
discard dust seal. See Figure
8-36.
4. Remove stub shaft seal by
prying out with screwdriver and
discard.
5. Inspect needle bearing in ad-
juster plug and if rollers are
broken or pitted, remove needle
bearing by pressing from thrust
bearing end using Tool J-6221
and discard bearing. See Figure
8-37.
Figure 8-33—Pitman Shaft Over
Center Adjustment