Wheel Alignment (Procedures): OPEL: Adjustment: Caster

If caster is not within specifications, adjust by changing shims on upper control arm shaft. Raise vehicle and place jack stands under lower control arms. Remove wheel on side which requires caster adjustment.
Loosen hex. nut from upper control arm shaft and remove shaft. Adjust caster by replacing shims on inside legs of control arm shaft. Make sure smaller washer is installed on leg nearest front of vehicle.