Cross Caster And Camber; Minor Service; Wheel Bearing B & F Series - Pontiac FIREBIRD 1972 Service Manual

EQUIPMENT MEASURING FROM SIDEWALL OR
WHEEL FELLOES
When using this type of equipment, wheel run-out will
have a very direct bearing on the readings. Since the allow-
able run-out is 1/8", the readings could possibly be off as
far as
1/8"
on each wheel if the effect of run-out is not
cancelled. By taking the average of three readings with the
wheel rotated 120" for each reading, the error due to wheel
run-out can be cancelled. This should be done as follows:
After moving the car forward on level floor, take first
reading.
Mark sidewall of both tires with the number "1" at
rear of tire where instrument bears.
At 120" intervals (i.e. 1/3 and 2/3 distance around
the tire) mark the numbers "2" and "3" on both tires.
Raise wheels off floor and hand spin until the number
"2"
is in the position which number "1" occupied
when the first reading was taken.
Push car back one foot and bring forward to position
and take second reading. This reading will then be
taken with the instrument bearing 120" around the
wheel from where the first reading was taken.
Use the same procedure for taking the third reading.
Average the three readings to find the actual toe-in.
SET TOE-IN
1. Remove steering wheel trim cover or horn button and
set steering gear on center position (high point of
worm) by turning steering wheel until index mark on
steering shaft is exactly at top. This mark locates the
high point, or middle of gear travel.
2. Loosen all tie rod adjuster sleeve clamp bolts. To
increase toe-in turn left tie rod adjuster sleeve in di-
rection of rotation of wheels, when car moves for-
FRONT SUSPENSION 3-2 1
MINOR SERVICE
.
WHEEL BEARING (B & F SERIES)
3.
REMOVE
4.
ward; turn right tie rod adjuster sleeve in opposite
direction. Turn both sleeves an equal amount until
toe-in is set at proper specification.
CAUTION: Discard the nut and bolt of an ad-
juster sleeve clamp if rusted and after breaka-
way (nut starts to turn) the removal torque of
the nut exceeds 716. fi. (84 lb. in.). Installa new
nut and bolt having the same part number to
assure proper clamping at the specified nut
torque.
3. Make sure front wheels are straight ahead by measur-
ing from a reference point at same place on each side
of frame center to front of wheel rims. If measure-
ments are not equal, turn both tie rod adjuster sleeves
in same direction (so as not to change toe-in) until
measurements become equal. Recheck toe-in since
toe-in measurement is accurate only with wheels in
straight-ahead position.
CAUTION: See CAUTION on page l of this
Section regarding the fastener refered to in
step 4.
4. Tighten tie rod adjuster sleeve clamp nuts to 20 lb. ft.
torque on B, A, G and F Series or to 12 lb. ft. torque
on X Series.
C AUTI 0 N: Before tightening, apply penetrat-
ing oil between each clamp and adjuster sleeve
that is rusted Rotate the clamps until they
move freely Open end of clamps should be
OO-45"forward from a vertical 'l.lown"position
on B, A, G and F Series. Open end of clamps
should be 0"-30" forward or rearward from a
vertical "'up" position on X Series.
CROSS CASTER A N D CAMBER
Reset either or both sides accordingly when checking or
after resetting alignment so that cross for the left side
caster to right side caster and left side camber to right side
camber is less or equal to specification. When resetting for
cross, maintain the caster and camber on each side within
their respective specifications.
1. Raise car and support at front lower control arm.
2. Remove hub cap or wheel disc from wheel.
Remove wheel and tire assembly.
Remove brake caliper assembly.
CAUTION: Brake hose is still connected to
caliper assembly; therefore, caliper assembly
must be moved out of way and supported so
brake hose will not be damaged.