27 21 040 Replacing radial shaft seal for actuator shaft (ATC 35L)

WARNING: This page is about a different car, the 2018 BMW 330i xDrive and 2017 BMW 330i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required :

11 1 200
11 1 380
23 0 490

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary tasks :

Disconnect battery negative lead.
Remove CROSS MEMBER .

Removal:

Disconnect connector (2).

Release screws (1) and remove transfer box control unit (longitudinal torque module) (3).

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Thread special tool 23 0 490 into radial shaft seal (1).

Drive out radial shaft seal (1) with impact weight (2).

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Installation:

Push the assembly sleeve 11 1 380 over the actuator shaft.

IMPORTANT: Nonobservance involves a risk of damage to the radial shaft seal.

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Slide the new radial shaft seal (1) over the assembly sleeve (2) onto the actuator shaft.

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Drive radial shaft seal fully home using special tool 11 1 200 and plastic hammer.

Remove the assembly sleeve.

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Install transfer box control unit (longitudinal torque module) (3).

Tighten down screws (1).

Tightening torque 27 10 3AZ .

Connect connector (2).

Replace O-ring.

NOTE: The radial shaft seal for the actuator shaft must also be replaced.

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Required follow-up work:

Install CROSS MEMBER .
Connect battery negative lead.