Pontiac tempest 1968 - Check and Set Toe-In

3-4
1968 PONTIAC SERVICE MANUAL
4. To decrease positive camber add shims to both
front and rear bolts.
SHIM AS REQUIRED—AT LEAST
ONE SHIM MUST BE USED AT
EACH BOLT
UPPER CONTROL ARM
NOTE; By adding or subtracting an equal amount
of shims from front and rear bolts, camber will be
changed without affecting caster.
CHECK AND SET TOE-IN
Check and set toe-in (see SPECIFICATIONS) with
a trammel or with other reputable front end aligning
equipment, measuring from sidewall of tire or wheel
felloes, using methods given below.
MEASURING BY TRAMMEL
Fig. 3-4 Caster - Camber Shims (Tempest Shown)
Fig. 3-5 Tool J 22618 for Pontiac Upper Control
Arm Bolts
1. To Increase negative caster add shims to front
bolt or remove shims from rear bolt.
1. After moving car forward on level floor, chalk
tread on both front tires at point 9" above floor.
2. With trammel set at center-to-center distance
of front tires, make mark with chalk on each front
tire exactly trammel width apart.
3. Push car forward (never backward) until chalk
with' trammel marks is 9" above floor at rear of
wheels.
4. Measure difference from trammel marks made
when chalk was in front of wheel; if trammel marks
are now greater than when marked at front, wheels
toe-in by this amount (see SPECIFICATIONS).
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 allowable 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:
1. After moving the car forward on level floor,
take first reading.
2. Mark sidewall of both tires with the number
"V* at rear of tire where instrument bears.
3. At 120° intervals (i.e. 1/3 and 2/3 distance
around the tire) mark the numbers "2" and "3"
on both tires.
2. To decrease negative caster remove shims
from front bolt or add shims to rear bolt.
3. To increase positive camber remove shims
from both front and rear bolts.
4. Jack up and turn wheels until the number "2"
is in the position which number "V
7
occupied when
the first reading was taken.
5. Push car back one foot and bring forward to
position and take second reading. This reading will