31 21 090 Removing and installing/replacing left or right swivel bearing

Special tools required:

2 359 147
31 2 230

IMPORTANT: To guarantee optimum power transmission from the swivel bearing to the spring strut, the special tool 2 359 147 must be used for installation on the spring strut!
Special tool 2 359 147 may only be disassembled after tightening the swivel bearing screw fitting on the spring strut!

Necessary preliminary tasks:

Remove FRONT WHEEL .
Remove FRONT BRAKE DISC .

Removal:

Left side only:

Slacken nut (1).

Remove jointed rod (2) from left wishbone.

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Release socket head cap screw (1).

Withdraw wheel speed sensor (2) from bore hole.

IMPORTANT: Check sensor head for damage and replace as necessary!

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Slacken nut (1).

If necessary, hold up at the Torx socket.
Release track rod end (2) from swivel bearing.

Unscrew nut (3).
If necessary, hold up at the Torx socket.
Release tension strut (4) from swivel bearing.

Slacken nut (5).

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If necessary, hold up at the Torx socket.
Release wishbone (6) from swivel bearing.

Support swivel bearing with workshop jack and suitable fixture.

Slacken nut (1).

Pull out screw (2) and detach holder (3).

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IMPORTANT: Expand swivel bearing below the screw feed-through to prevent damage to the swivel bearing!

Expand swivel bearing with special tool 31 2 230.

Lower workshop jack and remove swivel bearing.

Installation note:

Keep press fit of swivel bearing and spring strut in lower area clean and free from oil and grease.

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Installation:

Replacement:

Remount WHEEL BEARING .
Remount BRAKE GUARD PLATE .

IMPORTANT: Align special tool 2 359 147 as shown to ensure a correct installation on the swivel bearing!

Special tool 2 359 147 may only be removed after the screw connection is applied!

Expand swivel bearing with special tool 31 2 230, align based on gap to bridge (1) on rear side of spring strut and push upwards.

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Using special tool 2 359 147 and a torque wrench with ring wrench attachment, pull swivel bearing to limit position (tightening torque 20 Nm).

Remove special tools 31 2 230.

Part: Replace nut (2) and bolt (1).

Insert bolt (2).

Mount holder (3).

Tighten nut (1).

Tightening torque: 31 31 4AZ .

Remove special tool 2 359 147.

Installation note:

Screw head must point in direction of travel.

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Clean bore for pulse sensor and lubricate with Staburags NBU 12/K lubricating grease.

Insert pulse sensor (2) in bore hole.

Tighten hexagon socket screw (1).

Tightening torque: 34 51 3AZ .

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Position wishbone (6) on swivel bearing.

Part: Replace nut (5).

Tighten nut (5).

If necessary, hold up at the Torx socket.
Tightening torque: 31 12 4AZ .

Position tension strut (4) on swivel bearing.

Part: Replace nut (3).

Tighten nut (3).
If necessary, hold up at the Torx socket.

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Tightening torque: 31 12 2AZ .

Position track rod (1) on swivel bearing.

Part: Replace nut (2).

Tighten nut (2).
If necessary, hold up at the Torx socket.
Tightening torque: 32 21 3AZ .

Left side only:

Position jointed rod (2) of ride height sensor on wishbone.

Part: Replace nut (1).

Tighten nut (1).

Tightening torque: 37 14 4AZ .

Installation note:

Sensor lever (3) must point from ride height sensor to left front wheel.

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Required follow-up work:

Install.FRONT BRAKE DISC .
Install FRONT WHEEL .
Carry out wheel alignment procedure. Refer to 32 00 150 CARRY OUT KINEMATICS DIAGNOSIS SYSTEM WHEEL ALIGNMENT WITH VEHICLE LOAD UP TO DESIGN POSITION or 32 00 155 KINEMATICS DIAGNOSIS SYSTEM WHEEL ALIGNMENT WITH RIDE HEIGHT MEASUREMENT WITHOUT LOADING THE VEHICLE .