Installing Wheel With Central Bolt

1. 1.1. Check the wheel bolt for damage.

   There must be no scratches or cracks on the conical area, trapezoidal thread and inner toothing on the bolt.

   Replace the wheel bolt if it is damaged or if you have any doubts.

   Fig 1: Identifying Wheel Bolt (Central Bolt)

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2. 1.2. Check the lockable wheel bolt (locking mechanism/one per wheel).
   Fig 2: Identifying Lockable Wheel Bolt (Locking Mechanism)

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   1. 1.2.1. Check that the toothed locking pin is not stiff. After pressing the pin into its cartridge, it must return to its original position with force and without catching.
   2. 1.2.2. The toothing on the locking pin must not be damaged.
   3. 1.2.3. Replace the lockable wheel bolt(s) if they are damaged or if you have any doubts.
3. 1.3. Before screwing on the wheel bolt, check that the lockable wheel bolt (locking mechanism) is engaged (the locking mechanism must be in the wheel hub).

   For safety reasons, only remove the lockable wheel bolt (locking mechanism) in order to check it and then reinsert it immediately in the wheel hub.

4. 1.4. All contact surfaces of the wheel, wheel hub and brake disc as well as the trapezoidal thread in the wheel hub must be free of abrasion, sand, dust or chips.

   Apply some aluminum paste on the trapezoidal thread of the wheel hub if necessary. 

5. 1.5. Apply some aluminum paste on the trapezoidal thread of the wheel hub.
6. 1.6. Apply a thin coating of aluminum paste on the cylindrical part of the wheel hub.
7. 1.7. Only fit brake discs with driver pins that have been approved for centre-lock wheels.

Use an assembly aid 9794  (hub extension) -1-  on vehicles with PCCB (Porsche Ceramic Composite Brake).

When fitting the wheel, the vehicle must not be supported by the wheel to be secured.

Fig 3: Identifying Hub Extension (Assembly Aid)

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1. 3.1. Pull the lockable wheel bolt out of the wheel hub.
2. 3.2. Check the condition of the lockable wheel bolt and replace it if necessary.

   Carry out a function test (element can move axially with automatic return to initial position). Check mechanical state and perform visual inspection (O-ring, inner and outer toothing).

   The lockable wheel bolt must not be repaired (O-ring can be replaced of course).

   Replace the lockable wheel bolt assembly if it is damaged.

Information 

Generally, there is no need to re-grease the inside of the bolt, except in the following situations:

• A very high or very low torque is required to loosen the wheel bolt (more than 700 Nm/518 ftlb. or less than 400 Nm/296 ftlb.). 
• In the event of a jerking, fluctuating tightening torque. 
• If you feel any stiffness or stip-slick effect when turning the cone ring -1- for the wheel bolt by hand (cone ring -1- turns back and forward). Apply a certain amount of pressure when checking (turning the cone ring to the wheel bolt -arrows-  ).
  Fig 4: Turning Cone Ring On Central Bolt

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1. 4.1. Remove cone ring -1-  from central bolt -3-  .

   A circlip holds the cone ring -1-  in the wheel bolt -3-  .

   To remove the cone ring -1-  , detach it from the wheel bolt -3-  by tapping sharply on a wooden base (threaded side facing down to the wood).

   Fig 5: Disassembling Central Bolt

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2. 4.2. Re-grease surfaces of the disassembled central bolt (as shown in the overview). 
   Fig 6: Overview Of Central Bolt

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   Surface	Designation	Grease with Optimoly TA (aluminum grease) Part No. 000.043.020.00
   1	Circular area on central bolt -1-	Apply a light  coating of grease (approx. 0.2 - 0.5 mm thick).
   2	Trapezoidal thread on central bolt -2-	Apply a generous  coating of grease (approx. 0.5 - 1.0 mm thick).
   3	Washer -3-	Washer -3- must not  be greased (applies to both sides). The washer will be regreased automatically on both sides during assembly and when the components are subsequently screwed together.
   4	Circular area of cone ring -4-	Apply a light  coating of grease (approx. 0.2 - 0.5 mm thick).
   5	Reserve bores on cone ring -5-	Fill bores with grease so that they are 1/3 to 2/3 filled with grease.
   6	Inner circular area on cone ring -6-	Apply a light  coating of grease (approx. 0.2 - 0.5 mm thick).
   7	Conical area on cone ring -7-	Apply a light  coating of grease (approx. 0.2 - 0.5 mm thick).

3. 4.3. Insert the cone ring into the wheel bolt in such a way that the circlip engages in the groove on the wheel bolt.

Fig 7: Greasing Conical Surface Of Wheel Bolt

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Information 

When fitting all wheels, the vehicle must never be supported by the wheel to be fitted. → Lifting the vehicle 

Fig 8: Lifting Vehicle

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Fig 9: Tightening Central Bolt Using Socket Wrench 9796

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Information 

The tightening torque was increased from 500 Nm (370 ftlb.) to 600 Nm (444 ftlb.) in the course of model year 2011  .

The higher tightening torque also applies to older vehicles. 

Fig 10: Identifying Wheel Tightening Angle

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1. 7.1. Step 1 -1-  : Tighten central bolt to 600 Nm (444 ftlb.).

   Get a second person to press the brake pedal to prevent the wheel from turning. 

2. 7.2. Step 2 -2-  : Loosen the central bolt again (slightly) by approx. 60° (1/6 turn).
3. 7.3. Step 3 -3-  : Tighten the central bolt to a final tightening torque of 600 Nm (444 ftlb.)  .

→ After fitting the wheel, make sure that the locking pin is engaged correctly in the central bolt.

If the locking pin is still at the rear position → Wheel bolt not secured  and has not yet engaged in the inner toothing of the central bolt, the central bolt is still not secured and must be secured manually to prevent it from becoming loose.

To do this, turn the locking pin to the left and right using a 1/2-inch square extension until it engages in the central bolt.

This applies to both road and race track use.

Fig 11: Locating Wheel Bolt (Not Secured Position)

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When the central bolt is secured, the end of the locking pin -1-  will be flush with the inner toothing of the central bolt.

Fig 12: Locating Wheel Bolt

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Then press the cap in until it is seated securely. Grease the rubber ring on the cap lightly beforehand if necessary.

Now lower the vehicle.

Fig 13: Fitting Crested Hub Cap

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• Tightening the central bolt in an emergency 

  If you do not have the correct torque wrench required to tighten the central bolt to the prescribed high tightening torque in a breakdown situation, the emergency tightening procedure must be performed. 

• The central bolt must always be fitted using the original tool (stored in the luggage compartment).
• Tighten the central bolt with a long lever using a lot of force  . Then loosen the central bolt again slightly (by approx. 1/4 turn).

  Use a torque wrench to tighten the central bolt to exactly 100 Nm (74 ftlb.).

  Draw a line at the marking ^ 100 Nm  on the wheel.

  Fig 14: Tightening Central Bolt

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• Tighten the central bolt further with a long lever until the square (Stop) marking  is aligned with the line you made on the wheel  .

  This tightens the central bolt sufficiently to allow you to drive to the next qualified workshop.

• Tighten the central bolt immediately (at the next qualified workshop) to 600 Nm (444 ftlb.) using the three-step tightening procedure  .