10•16 Suspension and steering
Checking - general
11 Due to the special measuring equipment
necessary to check the wheel alignment, and
the skill required to use it properly, the
checking and adjustment of these settings is
best left to a Saab dealer or similar expert.
Note that most tyre-fitting shops now possess
sophisticated checking equipment.
12 For accurate checking, the vehicle must
be at the kerb weight, i.e. unladen and with a
full tank of fuel, and the ride height must be
correct (see Section 9).
13 Before starting work, check first that the
tyre sizes and types are as specified, then
check the tyre pressures and tread wear, the
roadwheel run-out, the condition of the hub
bearings, the steering wheel free play, and the
condition of the front suspension components
(Chapter 1). Correct any faults found.
14 Park the vehicle on level ground, check
that the front roadwheels are in the straight-
ahead position, then rock the rear and front
ends to settle the suspension. Release the
handbrake, and roll the vehicle backwards
approximately 1 metre, then forwards again, to
relieve any stresses in the steering and
Toe setting - checking and
Front wheel toe setting
15 The front wheel toe setting is checked by
measuring the distance between the front and
rear inside edges of the roadwheel rims.
Proprietary toe measurement gauges are
available from motor accessory shops.
16 Prepare the vehicle as described in
paragraphs 12 to 14 above.
17 A tracking gauge must now be obtained.
Two types of gauge are available, and can be
obtained from motor accessory shops. The first
type measures the distance between the front
and rear inside edges of the roadwheels, as
described previously, with the car stationary.
The second type, known as a "scuff plate",
measures the actual position of the contact
surface of the tyre in relation to the road surface,
with the vehicle in motion. This is achieved by
pushing or driving the front tyre over a plate,
which then moves slightly according to the scuff
of the tyre, and shows this movement on a
scale. Both types have their advantages and
disadvantages, but either can give satisfactory
results if used correctly and carefully.
Alternatively, a tracking gauge can be fabricated
from a length of steel tubing, suitably cranked to
clear the engine and gearbox assembly, with a
set-screw and a locknut at one end.
18 Many tyre specialists will also check toe
settings free, or for a small charge.
19 Make sure that the steering is in the
straight-ahead position when taking
20 If adjustment is found to be necessary,
clean the ends of the track rods in the areas of
the adjustment pin locknuts.
21 Slacken the locknuts (one at the inner and
outer end of each adjustment pin), and use a
pair of grips to turn each track rod by equal
amounts in the same direction. Only turn each
track rod by a quarter of a turn at a time,
22 Check that the track rod end balljoints are
centralised, and not forced to the limit of
movement in any direction.
23 When adjustment is correct, tighten the
24 Check that the track rod lengths are equal,
and that the steering wheel spokes are in the
Rear wheel toe setting
25 The procedure for checking the rear toe
setting is same as described for the front in
paragraph 17. The setting is not adjustable -
see paragraph 10.