Removing Wheel With Central Bolt

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Socket wrench 9796 for central wheel lock

• Only the > 9796 - socket wrench  may be used on 911 vehicles with centre-lock wheel! y Socket wrench 9796 for central wheel lock 

  Information 

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  Removing/fitting wheels without touching the ground

• When fitting all wheels, the vehicle must never be standing on the ground (make sure the wheels are not touching the ground!). 
• Otherwise, the wheels cannot be fitted correctly because of the weight of the vehicle! 

  Information 

  • Release tool for removing the hub cap is available in the Parts Information.
  • Alternatively, the release tool in luggage compartment can be used.

1. Carefully lever off the hub cap using the release tool.

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   Removing hub cap with release tool

   1. 1.1  Insert the metal tab into the opening groove on the central bolt and swivel back the handle -Arrow-  .
2. Insert > 9796 - socket wrench  on the central lock to unlock the lockable wheel bolt.

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   Positioning the tool correctly

   1. 2.1  The > 9796 - socket wrench  must be positioned and pressed on until it engages with an audible click > Positioning the tool correctly. 
   2. 2.2  If the lockable wheel bolt is difficult to move in the axial direction (becomes tilted in the central wheel bolt toothing/socket cannot be fitted), loosen the locking mechanism using a suitable plastic mandrel (press towards wheel hub).

      Information 

      • When loosening the central bolt, make sure that the tool remains fully engaged and does not slide off even slightly (risk of damage to the lockable wheel bolt/locking mechanism).
3. Loosen central bolt using > 9796 - socket wrench  and > V.A.G 1601 - torque wrench  .

   A helper must press the brake pedal forcefully and hold the steering wheel firmly! 

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   Loosening central bolt (turning anti-clockwise)

4. As soon as possible, unscrew the central bolt by hand using > 9796 - socket wrench  and set it down in such a way that no dirt can get onto the conical surface or the trapezoidal thread.

   The tool must remain fully inserted until the central bolt is removed! 

5. On vehicles with PCCB brake discs, screw > 9794 - assembly aid -1-  into the wheel hub. This prevents damage to the brake disc when removing the wheel.

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   Assembly aid (hub extension)

6. Remove the wheel carefully.

   Use a > VAS 6266A - wheel fitting trolley  on the rear axle to prevent damage to the rim and brake cover plate!

7. After removing the wheel, check whether the cone ring and circlip -1-  have become detached from the central wheel lock and are still in the hub centering bore.

   Due to the adhesive effect of the lubricant, there is a possibility that these components will become detached when removing the central wheel lock.

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   Circlip/cone ring in the centering bore

8. Visually inspect the components.

   Thoroughly remove old lubricant and dirt! 

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   Checking rim and central wheel lock

   1. 8.1 Check contact surfaces: 
      • Contact surface of wheel -1-  , conical seating of wheel -2- 
      • Contact surface of brake disc -3-  , driver pin -4-  , wheel hub -5- 
      • Cone ring of central bolt -6- 

      Uniform wear marks and dark abrasion are normal and not important. 

      Carefully remove dirt from the components before re-installing them! 

      Components that are worn down, porous or have badly scratched surfaces must be replaced! 

      Information 

      A circlip holds the cone ring in the central bolt.

9. Function test on locking mechanism and cone ring: 
   1. 9.1  Check that the components are fitted securely.
   2. 9.2 Check locking mechanism function: 

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      Locking mechanism function

      • Press the locking pin of the locking mechanism approx. 10 mm into the central bolt. When released, the locking pin must snap back automatically -Figure 2-  .
      • If this is not the case -Figure 1-  , turn the locking mechanism on the inside by approx. 1° to 2°. The pin should then snap back.
      • If the locking mechanism still sticks => Replace central wheel lock! 
      • It must be possible to turn the locking mechanism (inside) clockwise  (audible click), but not anticlockwise! 
   3. 9.3 Twist test on cone ring: 

      The cone ring -1- must turn in both directions with no great resistance or jolting -Arrows-  !

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      Turning cone ring

   4. 9.4  If this is not the case, disassemble the central wheel lock.

      > 440737 DISASSEMBLE AND ASSEMBLE CENTRAL WHEEL LOCK 

10. Check rim and rear brake cover plate.
    1. 10.1  Check inner part of rim for damage through the brake cover plate.
    2. 10.2  Check that the balancing weights are fitted and secured correctly.
    3. 10.3  Check brake cover plate for damage (kinks, dents, distortion, distance to brake disc).