Replacing Rear Wheel Bearing

Information 

• The wheel bearing must not come into contact with magnetic objects (e.g., magnetic screwdriver, magnet). 
• Screws and nuts are Geomet-coated and must not be greased. 
• Grease the toothing of the drive shaft slightly with Optimoly TA aluminium paste. 
• Drive shafts must not be left hanging from the joint stop! Tie them up. 
• Use new screws and lock nuts. 
• Observe correct tightening torques. 

  > WM, 4X00IN TIGHTENING TORQUES FOR REAR AXLE

1. Fit the wheel bearing at a centred position under the workshop press ram.
2. Fit wheel hub -2-  in the wheel bearing -1-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Pressing in wheel hub

3. Position a suitable pressure piece -3-  flat on the wheel hub -2-  .
4. Carefully press the wheel hub -2-  into the wheel bearing -1-  until the pressure increases -A-  (check the pressure gauge!).
5. Fit wheel bearing with wheel hub in the wheel bearing housing.
6. Fit fastening screws on wheel bearing. Tighten only to the specified tightening torque!

   > WM, 4X00IN TIGHTENING TORQUES FOR REAR AXLE

7. Tighten fastening screws on wheel bearing to the specified torque angle.
   1. 7.1 Mark one tooth of the relevant fastening screw and the wheel bearing housing -A-  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Marking fastening screw

   2. 7.2 Starting from the marked tooth, count off four teeth anti-clockwise and also mark this tooth -B-  .
   3. 7.3 Tighten the fastening screw by turning it four teeth -A-  in a clock-wise direction, > Final tightening + 120°  so that the second marking -1-  on the fastening screw is aligned with the marking -2-  on the wheel bearing housing.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Final tightening for fastening screw on wheel bearing

8. Remove the wheel bearing housing again and set it down carefully.
9. Insert the drive shaft in the wheel bearing housing and fit the wheel bearing housing/drive shaft assembly in the vehicle.

   > 425219 REMOVING AND INSTALLING WHEEL BEARING HOUSING  - section on "Installing"