Removing Camshaft Timing Gear (Sprocket)

→ Never turn the crankshaft against the rolling direction or when the chain tensioner is removed.

→ Proceed carefully with your work.

→ Only turn the engine at the crankshaft.

→ Reset the timing after working on the camshaft.

→ Observe general warning notes and working regulations.

1. Turn the crankshaft at the vibration balancer so that the vibration balancer's staking bore -2-  is located approx. 45° degrees in front of the lower staking point on the timing-case cover -1-  .
   Fig 1: Staking Bore 45 Degrees Before TDC Of Cylinder 1

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2. Remove chain tensioner. → Removing chain tensioner  .
3. Loosen all four screws of the camshafts (sprockets and camshaft controllers) (undo one to two turns). Counter at the respective hexagon.
   Fig 2: Loosening Camshafts (Illustrated With Timing-Case Cover Removed)

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   Information 

   • Move the camshafts carefully. Do not force. 
   • Turn in the other direction if necessary. 

   Information 

   A data matrix coding is shown on the staking dihedron of the camshafts. This is a square black/white dotted marking used for electronic identification purposes during the production process. This marking can be used as an aid when inserting the camshafts into the cylinder head. All four camshafts press against the valves the least when the data matrix coding is facing upwards during installation.

4. Turn all four camshafts so that all the data matrix codings at the adjustment edges point upwards approximately simultaneously (this enables the camshafts to exert the minimum amount of pressure on the valve lifters). The camshafts are turned at their hexagon using an appropriate open-ended wrench. Observe identical information on assembling the camshafts.
   Fig 3: Identifying Camshaft Position For Cylinders 1 To 4

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   Fig 4: Identifying Camshaft Position For Cylinders 5 To 8

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   Fig 5: Loosening Camshaft Hexagon Screw

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5. Loosen timing chain.
6. Remove screw for the respective camshaft timing gear -3-  and carefully take out camshaft timing gear -2-  with both hands under the timing chain. Loosen the camshaft timing gear using a rubber hammer carefully from behind if necessary.
   Fig 6: Exploded View Of Timing Chain And Sprockets

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. Double-chain camshaft drive
   2. Camshaft sprocket
   3. Screw, M12 x 140; as of October 2008: M12 x 110. Tighten fully after setting the timing.
   4. Deflector rail
   5. Screw, M8 x 35
   6. Camshaft-to-camshaft guide pad
   1. Direction of travel