Check And Set Toe-In; Measuring By Trammel; Removing Pontiac Upper Control Arm Nuts; Caster-Camber Shims (Tempest Shown) - Pontiac Grand Prix Service Manual

3 -4 1969
PONTIAC SER .VICE MANUAL
2. To decrease negative caster (positive 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.
To decrease positive camber (negative camber) add
shims to both front and rear bolts.
NOTE: By adding or subrracting 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
1. After moving car forward on level floor, chalk mark
tread on both front tires at point 9" above floor.
2. With trammel set at center-to-center distance of
front tires, make a chalk mark on each front tire
exactly trammel width apart.
3. Push car forward (never backward) until chalk mark
with trammel marks is 9" above floor at rear of
wheels.
4. Measure difference from trammel marks made
when chalk mark was in front of wheel; if trammel
marks are now greater than when marked at front,
wheels toe-in by this amount (see SPECIFICATIONS).
Fig. 3-5 Caster-Camber Shims (Tempest Shown)
UPPER CONTROL ARM
EACH BOLT.
Fig. 3-6 Removing Pontiac Upper Control Arm Nuts
With J 22618
b
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 "1" at
rear of tire where instrument bears.
3. At 120" intervals (i.e. 1/3 and 213 distance around
the tire) mark the numbers "2" and "3" on both tires.
4. 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.
5. 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.
6. Use the same procedure for taking the third reading.
7. Average the three readings to find the actual toe-in.