33 11 021 Replacing radial shaft seal for input flange of rear axle differential

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Special tools required:

IMPORTANT: Use only approved gearbox oils. See REAR AXLE - OPERATING FLUIDS .
Failure to comply with this instruction will result in serious damage to the rear axle final drive!

Necessary preliminary tasks:

Remove PROPELLER SHAFT AT FINAL DRIVE .

Remove retaining clip (1) and insert nut (2) with diaphragm seal.

Fig 1: Identifying Retaining Clip And Nut

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Mark position of flange nut (1) to bevel pinion (2).

Fig 2: Identifying Flange Nut And Bevel Pinion

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Release flange nut anticlockwise with special tools 33 5 050 and 33 5 070 by gripping the bevel pinion with special tools 33 5 060 and 33 5 070 .

Fig 3: Releasing Flange Nut

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Pull out radial shaft seal with special tool 00 5 010 .

Fig 4: Pulling Out Radial Shaft Seal

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Coat sealing lips of new radial shaft seal and sealing surface of bevel pinion with final drive oil.

Drive in radial shaft seal with special tool 33 5 080 or 33 0 150 .

Fig 5: Driving Radial Shaft Seal With Special Tool 33 5 080/33 0 150

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Clean bevel pinion thoroughly to remove remnants of screw locking agent.

Fig 6: Identifying Bevel Pinion

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Check dust plate for damage, replace if necessary.

IMPORTANT: Clean flange nut thoroughly to remove remnants of grease and screw locking agent.

Pack collar insert (1) of flange nut with grease.

Apply a thin coating of grease to shaded area (2) of flange nut.

Coat at least four thread turns of flange nut with "Drei Bond adhesive type 1385".

Fig 7: Identifying Collar And Shaded Area

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IMPORTANT: In order to avoid damaging the rear axle final drive, do not under any circumstances tighten down the flange nut (1) beyond the marker point of the bevel pinion (2).

Fig 8: Identifying Bevel Pinion And Flange Nut

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Place insert nut (2) with diaphragm seal in flange nut.

Introduce retaining clip (1).

Fig 9: Identifying Retaining Clip And Nut

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After installation:

Check OIL LEVEL IN REAR AXLE DIFFERENTIAL and correct if necessary.