Saab SONETT III Service Manual page 106

CAMBER
Camber is understood to mean the deviation of the wheel
from the vertical, see fig. If the wheel tilts outwards,
camber is positive (+), and if it tilts inwards, camber is
said to be negative (—).
The correct camber for the Sonett III is 00 ± 1/4 0 in
other wards, the wheel must be vertical.
Checking and adjustment
Camber, and thus king-pin inclination
also, can be adjust-
ed by inserting shims under the bearing brackets of the
upper control arms. The desired result can thus be
obtained by the addition or removal of shims.
Increasing the thickness of shims under both brackets by
0.1 in. (2.5 mm) reduces camber by approx. 1/2°.
If, on the other hand, an 0.1 in. (2.5 mm) shim is removed
from under each bracket, camber will be increased by
approx. 1/2°.
Shims of equal thickness must always be used under both
brackets.
CASTER
Caster is the deviation of the king-pin axis from the ver-
tical when viewed from the side, and is generally expressed
in degrees. Caster varies greatly from ear to ear. In most
cases, the king-pin is inclined rearwards, as illustrated, and
caster is then said to be positive (+). If the king-pin is in-
clined forwards, easter is said to be negative (—). Finally,
the king-pin may be perfectly vertical, in which case caster
is 0. In the Sonett
III,
caster should be 2 ± 1/2° positive.
Checking and adjustment
If caster adjustment is called for, this can be done by
inserting shims under the bearing brackets of the upper
control arms.
Transference of shims with a thickness of 0.02 in. (0.5 mm)
from under the front bracket to under the rear bracket
results in a 1/2 0 increase in easter.
Transference of shims with a thickness of 0.02 in. (0.5
mm) from under the rear bracket to under the front
bracket results in a 1/2 0 decrease in easter.
The same thickness of shims as is removed from under
one bracket must thus always be fitted under the other
bracket.
KING
-
PIN INCLINATION
In point of fact, there is no king-pin in the true sense of
the term in the Saab ear, and the term king-pin inclination
is therefore instead applied to the inclination of the imag-
inary axis which passes through the centers of the two
ball joints and meets the ground near the center line of
the wheel. The correct inclination is 7 ± 1 0 .
Checking and adjustment
King-pin inclination is adjusted at the same time as cam-
ber and is changed by the same angle. It is not possible
to adjust k ing-pin inclination alone, as this is determined
by the steering knuckle. If the king-pin inclination is in-
correct after adjustment of camber, the fault is to be
found in the steering knuckle which should be renewed.
June 1970
SAAB
601-4