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3A-4
1 9 7 7 PONTIAC SERVICE M A N U A L
"Y" IS LESS THAN "X"
WHEN WHEELS TOE-IN
FIG. 3A-3 TOE-IN ADJUSTMENT
ALIGNMENT CORRECTION CHARTS
-
EXCEPT H SERIES
(Figs. 3 A - 4 through 3A-8)
To use the Front Alignment Correction Charts, first
select the correct chart for the vehicle being aligned.
Determine the present alignment of the subject vehicle. Find
the camber reading on the chart (left or right side) and the
caster reading (for the proper vehicle and options). Trace to
the point of intersection. The three digit code for front and
rear bolts indicates the shim change necessary to arrive at the
proper specification. Add or subtract shims from the front
or rear bolt as indicated. Retorque bolts and check corrected
alignment setting.
NOTE: A normal shim pack should contain a maximum
of one small and one medium shim. Adjust shim pack
as necessary without changing final dimension to meet
this requirement.
Example Use of Correction Chart
I. G Series models should have Caster of
+
5" (+0.5");
left-side Camber of
+
lo (+0.5");
-
and right-side camber of
-0.5'
(+0.5").
-
2 . Suppose the example vehicle shows
+
3 1/2" Caster
and
0"
Camber on the left side and + 2 3/4" Caster and
+
lo
Camber on the right side.
3. Specification in Fig. 3 A - l l show realignment is
advisable.
4. By using the chart we can determine that a left side
shim pack change of two large and one medium shim
subtracted from the front bolt and one medium and one small
shim subtracted from the rear bolt will bring the left side to
specificat ions.
5. On the right side subtract one medium shim from the
front bolt and add two large and one small on the rear bolt.
6. These changes will bring the vehicle close to the exact
specification and will certainly be within service reset
tolerances.
ALIGNMENT ADJUSTMENTS
-
H
SERIES
CASTER AND CAMBER
Cam Bolts (Fig. 3A-9)
Caster and camber adjustments are made by rotating, or
changing the position of, the cam bolts. The H Series uses
the front cam to adjust the camber setting and the rear cam
to adjust the caster setting. The lower control arm is designed
so that the camber setting should be made first. In other
words, adjust camber, then caster, then toe-in.
The front cam tends to move the control arm in or out
with respect to the vehicle. This movement will change caster.
Toe-in is conventional and is covered in this section.
Toe-In (Fig. 3A-10)
Toe-in can be increased or decreased by changing the
length of the tie rods. A threaded sleeve is provided for this
purpose.
The tie rods are mounted ahead of the steering knuckle
and must be decreased in length in order to increase toe-in.
NOTE: Camber and caster adjustment is made by the
cam bolts which are the attachment for the lower control
arm. The front cam adjusts the camber and must be
made first. The rear cam adjusts the caster. Toe-in
adjustment must be checked after
camber and caster adjustment.
Camber Adjustment (Fig. 3A-9)
Camber angle is adjusted by loosening the front lower
control arm pivot nut and rotating the cam until proper
setting is reached. This eccentric cam action will move the
lower control arm in or out, thereby varying the camber.
Hold the cam bolt head while tightening the nut.
Caster Adjustment (Fig. 3A-9)
Caster angle is adjusted by loosening the rear lower
control arm pivot nut and rotating the cam until proper
setting is reached. This eccentric cam action will tend to move
the lower control arm fore or aft thereby varying the caster.
Hold the cam bolt head while tightening the nut.
Recheck camber after setting caster.
Toe-In Adjustment (Fig. 3A-10)
Toe-in is the difference in the distance measured between
the front and rear of the front wheels. The wheels must be
in the straight ahead position when adjusting toe-in. Toe-in
must be checked after camber and or caster adjustment.
1. Loosen the clamp bolt nut at each end of each tie rod
and rotate the sleeve until proper toe-in is reached.
2. Position the tie rod ball stud assembly straight on a
center line through their attaching points.
3. See Section 3B1 for position of tie rod clamps and bolts
after setting toe-in.
4. Tighten the clamp nuts.
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