Front

Installing caster eccentric

Includes: Replacing series control arm by a service control arm with caster eccentric.

Note!
^ The caster is not adjustable on standard vehicles. A caster eccentric can be retrofitted in the case of after sales service if necessary*.

The series control arm must be replaced by an adjustable control arm (service control arm) for this purpose. The installation of only one service control arm is permissible.

The service control arm is delivered with a caster adjusting facility (as a set). Part No. for vehicles with automatic headlight beam adjustment = 996 341 941 01 (status: October 1999). It can also be used for vehicles without automatic headlight beam adjustment.

The set consists of a special screw (A), two eccentrics (B) and the fastening nut (C). Only the fastening nut (C) is available as a single part.

Differences with respect to the series control arm
In order to realize caster adjustment, the service control arm is provided with a special bearing at the connecting point to the diagonal arm.





This special bearing has a larger bore with respect to the series control arm (dimension X). There are also corresponding bearing surfaces for the two eccentrics.
A Special screw
B 2 eccentrics
C Fastening nut
D Service control arm. Dimension X = 20 mm (dimension X on series control arm = 14 mm)

* Requirement: In the case of caster values lying outside the tolerance or excessive caster difference between the right and left sides, in combination with a complaint about the handling. Required values in Wheels, Tires, Suspension, Alignment. Prerequisite for installation: wheel suspension parts and body mounting points are in order. The caster eccentric must never be used to compensate for incorrect caster values resulting from deformed parts.

Installing caster eccentric





Replacing series control arm by the service control arm.

For pressing off from the ball joint, use special tool 9560.

When installing the control arm, make sure that the control arm fastening screw (E) is tightened only in vehicle position (Figure 480_97).





Vehicle position means: Vehicle must be standing on its wheels, or the wheel suspension is lifted with a universal lift until the markings (arrow) line up. Use correct tightening torques.

Adjusting caster
With the fastening nut (C) loosened, adjust the caster by turning the special screw (A).

Adjusting values and suspension alignment in Wheels, Tires, Suspension, Alignment.





Tighten fastening nut (C) to 160 Nm (118 ft. lbs.).
A Special screw
B 2 eccentrics
C Fastening nut