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Removing and installing wheel bearing housing > < Wheel bearing assembly: Assembly overview

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Removing and installing wheel bearing unit
Removing and installing wheel bearing unit
Special tools and workshop equipment required
   
t  Torque wrench -V.A.G 1332-
Carry out the following work:
Removal:
–  Loosen drive shaft bolt at wheel hub:
t  Twelve-point head bolt with ribbing → Chapter
t  Twelve-point head bolt without ribbing → Chapter
  Caution
Wheel bearings must not be subjected to load after loosening bolt securing drive shaft at wheel hub.
If they have to support the weight of the vehicle they will be damages and their service life will be reduced.
It is not permissible to turn drive shaft bolt more than 90° anti-clockwise if vehicle is standing on its wheels.
Do not attempt to move the vehicle without the drive shafts fitted; this would result in wheel bearing damage. If a vehicle nevertheless has to be moved, comply with the following:
t  Install an outer joint instead of the drive shaft.
t  Tighten outer joint to 120 Nm.
–  Loosen wheel bolts.
–  Raise the vehicle.
–  Remove wheel.
–  Remove brake caliper with brake carrier and suspend from body using wire → Brake systems; Rep. gr.46
–  Remove ABS speed sensor → Brake systems; Rep. gr.46
–  Remove brake disc.
  W00-0428
–  Remove nuts -arrows-.
–  Pull swivel joint out of suspension link.
–  Pull drive shaft out of wheel hub.
  N40-10188
–  Remove bolts -arrows-.
–  Take wheel bearing unit -1- out of wheel bearing housing.
Installation
Installation is carried out in reverse order. In the process, note the following:
–  Install brake caliper → Brake systems; Rep. gr.46.
–  Tighten drive shaft bolt at wheel hub:
t  Twelve-point head bolt with ribbing → Chapter
t  Twelve-point head bolt without ribbing → Chapter
  Caution
During this step, vehicle must not be standing on its wheels.
The wheel bearing can be damaged by the weight of the vehicle if the bolt is loosened.
  M40-10029
Distinguishing features between twelve-point head bolt with ribbing and twelve-point head bolt without ribbing.
The twelve-point head bolts can be distinguished by the contact surfaces -arrow A- and -arrow B-.
I - Twelve-point head bolt with ribbing -arrow A-
II - Twelve-point head bolt without ribbing -arrow B-
–  Install ABS speed sensor → Brake systems; Rep. gr.46.
  N40-10569
Specified torques
ComponentTightening torque
Drive shaft to wheel hub „twelve-point head bolt with ribbing“
t  Use new bolt.
70 Nm + 90°
Drive shaft to wheel hub „twelve-point head bolt without ribbing“
t  Use new bolt.
200 Nm + 180°
Wheel hub with wheel bearing to wheel bearing housing
t  Use new bolts.
70 Nm + 90°

   

Removing and installing wheel bearing housing > < Wheel bearing assembly: Assembly overview