Buick LeSabre 1965 Service Manual page 493

STEERING GEAR, STEERING COLUMNS AND LINKAGE POWER STEERING 8 - 2 9
union. See Figure 8-19. Refer to
paragraph 8-18 for r e p l a c i n g
shaft seal without removing pump.
1. Remove pump pulley nut. Dis-
connect belt from pulley and re-
move pulley u s i n g a suitable
puller. Do not hammer pulley off.
2. Disconnect return and pres-
sure hoses from pump. Use
masking tape to cover the hose
connector and union on pump
and open ends of the hoses to
avoid entrance of dirt.
3. On 46000, 48000 and 49000 Se-
ries cars remove the two nuts
that attach pump to rear mounting
bracket and remove the two bolts
that attach the rear bracket to
the engine. Remove rear mount-
ing bracket.
4. On 45000 Series cars loosen
nut s e c u r i n g pump to r e a r
bracket.
5. Complete pump removal by
removing the two bolts that attach
pump to the front mounting brack-
et. It is not necessary to remove
front mounting bracket.
e. Installation of Oil Pump
1. Install the oil pump by revers-
ing the procedure for removal.
2. When pump is reinstalled on
engine, adjust drive belt tension.
See Figures 2-39 or 2-40.
3. Fill pump reservoir to correct
level with Buick Power Steering
oil.
4. Start engine and maintain oil
level in reservoir while allowing
engine to idle for at least three
minutes before turning steering
wheel. Then rotate steering wheel
through its entire range slowly
a few times with engine running.
Recheck oil level and inspect for
possible leaks.
NOTE: If air becomes trapped in
the oil, the oil pump may be noisy
until all air is out of oil. This
may take some time since air
trapped in oil does not bleed out
rapidly.
8 - 1 3 ADJUSTMENT OF
POWER STEERING
GEAR
a. Adjustment of Power
Steering Gear in Car
IMPORTANT: Thrust b e a r i n g
preload and worm to rack piston
nut ball preload have little effect
on handling. The most important
gear adjustment affecting handling
is the pitman shaft "overcenter"
preload. The "overcenter" ad-
justment is made without remov-
ing g e a r from car, thus on
handling complaints this adjust-
ment should be checked and cor-
rected and car road tested before
removing gear to change thrust
bearing preload or ball preload.
1. Remove pitman arm from pit-
man shaft. See Figure 8-28.
NOTE: Never attempt to adjust
steering gear with pitman arm
connected to pitman shaft.
2. Remove cap from steering
wheel. See Figure 8-6.
3. Turn steering wheel slowly
through its full travel to check
for binding, tight spots or uneven
action.
NOTE: If a spring scale is used
to check adjustments, f o l l o w
specifications listed in paragraph
8-8 (b).
4. Turn steering wheel to ex-
treme right or left position. At-
tach Torque Wrench J-5853 to
steering wheel retaining nut and
check the torque required to turn
the wheel steadily in the range
where lash normally exists be-
tween rack-piston nut and pitman
shaft sector. See Figure 8-31.
The lash range exists for one-
Figure 8-31—Checking Adjustments
in Car
eighth turn of steering wheel from
either extreme position.
5. The reading on the torque
wrench should be between 1 and 8
inch pounds, which would indicate
normal preload at the t h r u s t
bearing and drag at the valve
assembly.
6. Turn steering wheel 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 ad-
juster to check ball preload when
gear is positioned as instructed
in Step 6.
7. Check the torque required to
turn the wheel. The r e a d i n g
should be 1-1/2 to 4-1/2 inch
pounds higher than reading re-
corded in Step 5 which would in-
dicate n o r m a l ball p r e l o a d
between worm and rack-piston
nut.
NOTE: The thrust bearing pre-
load and ball preload readings
should be close to the minimum
specification on a gear that has
been in use. On a new gear, these
readings will be greater.
8. Check torque required to turn
wheel through the gear "high-
point" (center p o s i t i o n ) . The
reading should be 4 to 8 inch