Pinion Flange: Service and Repair

26 11 100 Removing and installing three-hole flange

Special tools required:





Important!
It is absolutely necessary to replace the sunk nut!
The sunk nut already has a screw locking.
After the propeller shaft has been screwed into the rear axle final drive (sunk nut), a hardening time of at least 2 hours is absolutely necessary.
The hardening time may be extended at lower temperatures!
Failure to comply with these instructions may cause serious damage!





Necessary preliminary work:
^ Remove propeller shaft





Since the three-hole flange, the flexible disc and the propeller shaft are balanced as a single unit, the balance quality of the propeller shaft, flexible disc and three-hole flange may be compromised slightly when the three-hole flange is replaced.





Important!
Before removing propeller shaft:
The three-hole flange and the propeller shaft must be reassembled in the same position.
Mark three-hole flange (1), flexible disc (2) and propeller shaft (3) in one plane.





Release insert nut against direction of travel in clockwise direction with special tool 33 5 040 and 33 5 070.

Grip with special tool 23 0 020.

Release three-hole flange (1) from bevel pinion.

Tightening torque 26 11 6AZ.





Remove retaining clip (1) and gasket (2).

Installation note:
Retaining clip and gasket must be replaced.





Remove insert nut (1).

Installation note:
Insert nut must be replaced.





Before installing three-hole flange:

Clean insert collar (1) on flange nut and gearing on bevel pinion (2).

Fill insert collar (1) with grease.

Grease: BMW Service Operating Fluids.





Important!
Thread of flange hub must not be contaminated with grease.

Clean thread (1) of flange hub to remove adhesive residues.

Clean hub teeth (2), then coat with grease.

Grease: BMW Service Operating Fluids.





Place flange nut (1) with seal in insert collar of flange nut.

Install retaining clip (2).





Important!
The bi-hexagonal flange nut must not be used for bracing.

Failure to comply with this instruction may result in serious damage to the rear axle final drive.





Important!
Insert nut must be screwed into place within 5 minutes.
Tightening torque 26 11 6AZ.

Slide drive flange (1) to the limit position onto insert nut and secure.

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