33 10 021 Replacing output shaft seal in rear axle final drive

Special tools required: 

• 13 5 251
• 13 5 253
• 33 0 130

Necessary preliminary work: 

• Remove REAR AXLE FINAL DRIVE 

Drive out drive flange (1) with special tools 13 5 251 and 13 5 253 .

Fig 1: Removing Drive Flange Using Special Tools (13 5 251 And 13 5 253)

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Lever shaft seal (1) with a suitable open-end spanner (2) in direction of arrow out of rear axle final drive.

Fig 2: Removing Shaft Seal

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Installing new shaft seal: 

Install circlip (1) in sun gear in such a way that opening (2) is positioned at 6 o'clock.

Fig 3: Identifying Circlip In Sun Gear

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Installation note: 

Protector (1) serves to protect the sealing lips on shaft seal (2) when the drive flange is being installed!

Coat inner surface of protector (3) with provided grease only.

Fig 4: Identifying Shaft Seal And Protectors

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Drive in shaft seal to stop with special tool 33 0 130.

Do not remove protector (1).

Fig 5: Removing Protector

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Installation note: 

Clean shaft seal races on drive flange thoroughly.

Insert drive flange (1) to dimension A=4.5 cm into rear axle final drive (gearing on drive flange not visible).

Pull out protector at tab (2).

Push drive flange (1) into rear axle final drive as far as it will go and turn. Press in drive flange (1) further until circlip can be heard and felt to snap into place.

Fig 6: Pulling Out Protector Tab

Courtesy of BMW OF NORTH AMERICA, INC.

After installation: 

• Check rear axle final drive oil level  . See 00 11... CHECKING/TOPPING UP OIL LEVEL IN REAR DIFFERENTIAL or 00 11... CHECKING/TOPPING UP OIL LEVEL IN REAR AXLE FINAL DRIVE (DYNAMIC PERFORMANCE CONTROL) , correct if necessary