31 12 002 Removing and installing/replacing top left control arm

Special tools required:

33 5 206

NOTE:

Control arms with + or - marking (see illustration) are camber correction arms:

- Underdimension variant

+ Overdimension variant

These camber correction arms are used to correct the camber values by 30 minutes. To be used only if the tolerance values are exceeded or undershot!

An unmarked control arm is a standard part.

Fig 1: Identifying Control Arms With Underdimension And Overdimsion Variant

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Necessary preliminary work:

Remove FRONT WHEEL .
All-wheel drive vehicle/Dynamic Drive: If necessary, remove OIL RESERVOIR FOR HYDRAULIC STEERING FROM THE LEFT WHEEL ARCH .

N63 (with water-cooled DME control unit)

Unscrew screws (1) and (2).

Lay DME control unit with holder and oil reservoir to one side.

Fig 2: Identifying DME Control Unit Mounting Screws

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Release nut (1) on control arm (2) and remove.

Tightening torque 31 12 5AZ .

Installation note:

Replace nut.

Fig 3: Identifying Control Arm And Mounting Nut

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Secure swivel bearing (1) 33 5 206 with tensioning belt to spring (2).

Fig 4: Securing Swivel Bearing On Spring Strut Using Special Tool (33 5 206)

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Release nut (1) and remove ride height sensor jointed rod from control arm.

Installation note:

Replace self-locking nut.

Tightening torque 37 14 5AZ .

Fig 5: Identifying Ride Height Sensor Jointed Rod Mounting Nut And Bolt

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Release nut (2) and remove bolt (3).

Tightening torque 31 12 6AZ .

Installation note:

Keep control arm to swivel bearing connection clean and free from oil and grease.

Note direction of insertion of screw.

Screw must rest correctly in groove of ball stud!

Replace nut.

Tighten control arm as far as it will go in relation to swivel bearing.

Release nut (1) and remove screw.

Tightening torque 31 12 7AZ .

Release spring strut from control arm (2).

Installation note:

Note direction of insertion of screw.

Replace screw and nut.

Tighten in NORMAL POSITION .

Fig 6: Removing Spring Strut From Control Arm

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Release screw (1).

Tightening torque 31 12 5AZ .

Pull spring strut outwards and remove screw (1).

Remove control arm (2).

Installation note:

Replace nut.

Fig 7: Identifying Control Arm And Spring Strut Screw

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Risk of damage!

Observe assembly sequence.

Upper control arm must be screwed in normal position! (Adjustment of normal position, see below).

Insert bolt (2) (do not tighten down)
Adjust upper control arm to body to dimension (A).
Tighten screw (2).
Tightening torque 31 12 5AZ .
Tighten screw (1).
Tightening torque 31 12 5AZ .
Tighten spring strut/control arm (lower) screw connection.
Tightening torque 31 12 7AZ .
Tighten control arm/swivel bearing (3) screw connection.
Tightening torque 31 12 6AZ .

Fig 8: Identifying Control Arm/Swivel Bearing, Bolt And Screw
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Adjusting normal position:

Installation note:

The graphic shows the left control arm.

The protrusion is missing on the right side. Measure to the middle of the control arm.

Secure control arm (1) to body vertically to dimension (A) = 90 mm.

Fig 9: Identifying Control Arm Normal Position Dimension

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