Figure 12-17.Positive and negative directional movement
of upper control arm.
1. Shims of various thickness at upper or lower
2. Eccentrics at upper or lower control arm and
some use a strut rod for caster adjustment.
3. Elongated holes in the upper control arm or
frame. The holes are serrated in the control arm and
frame for a lock-tight fit.
Because all alignment angles are inter-related, one
affecting the other, it is suggested you make your
adjustments in the following order first-adjust caster,
second-camber, third-center the steering wheel and adjust
the tie rods so the wheels are straight ahead, and
Because of the variations in the different way each
manufacturer designs a vehicle, you are advised to
check the service manuals for specific adjustment
locations and procedures.
Regardless of the method or location of the
adjustment, you should always consider the positioning
of the upper control arm (specifically the ball joint) in
relation to the lower. Whenever an adjustment is
necessary, you must first consider in which direction you
should move the upper control arm.
Figure 12-18.MacPherson strut.