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

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Special tools required:

IMPORTANT: READ AND COMPLY WITH NOTES ON PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .

Necessary preliminary work:

Disconnect BATTERY NEGATIVE LEAD .
Remove TRANSMISSION CROSS MEMBER .

Disconnect connector (1).

Release screws (3) and remove transfer box control unit (longitudinal torque module) (2).

Tightening torque 27 10 3AZ .

Installation note:

Fig 1: Identifying Transfer Box Control Unit Connector

G08495706

Courtesy of BMW OF NORTH AMERICA, INC.

Replace O-ring.

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

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

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

Fig 2: Removing Radial Shaft Seal

G08504531

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 3: Identifying Assembly Sleeve (11 1 380)

G08504532

Courtesy of BMW OF NORTH AMERICA, INC.

Slide the new radial shaft seal (1) over the assembly sleeve 11 1 380 onto actuator shaft.

Fig 4: Identifying Assembly Sleeve (11 1 380) And Radial Shaft Seal

G08504533

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 5: Installing Radial Shaft Seal Using Special Tool (11 1 200)

G08504534

Courtesy of BMW OF NORTH AMERICA, INC.

Remove the assembly sleeve.