See Figures 1, 2, 3 and 4
CASTER AND CAMBER
Caster is the tilt of the upper end of the kingpin or the upper ball joint, which results in a slight tilt of the steering axis forward or backward. Rearward tilt is referred to as a positive caster, while forward tilt is referred to as negative caster.
Camber is the inward or outward tilt from the vertical (measured in degrees) of the front wheels at the top. An outward tilt gives the wheel positive camber. Proper camber is critical to assure even tire wear.
Caster and camber are adjusted traditionally by adding or subtracting shims behind the upper control arms. Since the vehicles covered in this information have MacPherson struts and no upper control arms, the normal way to adjust caster and camber is to replace bent or worn parts of the front suspension.
Camber is adjustable on the 1987-89 Sentra and Pulsar. Camber is adjusted by the strut-to-knuckle bolts. The upper bolt has an eccentric washer at each end. As the bolt is rotated, the knuckle moves in or out.
Toe is the amount, measure in a fraction of an inch (millimeters), that the wheels are closer together at one end than the other. Toe-in means that the front wheels are closer together at the front than the rear; toe-out means the rears are closer than the front. The vehicles are adjusted to have a slight amount of toe-in. Toe-in is adjusted by turning the tie rod, which has a right-hand thread on one end and a left-hand thread on the other.
Suspension height is adjusted by replacing the springs.