Removing Camshafts

→ Absolute cleanliness is essential when working on the engine.

→ Lay removed engine parts on a clean base and make sure to cover them.

→ Use the cover for dust protection when fitting the engine NR.165  on the engine assembly support.

1. Remove the plastic caps on the cylinder head. Press a small screwdriver into the center of the piercing point of each cap and lever out the caps.
   Fig 1: Identifying Plastic Caps On Cylinder Head

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Turn the engine at the assembly support so that the cylinder bank to be worked on stands vertically upwards.

   Cylinder bank 1-3: 

   Information 

   • The engine must be always turned clockwise (running direction of engine) during assembly work on the timing drive mechanism. 
   • Only turn engine using the crankshaft pulley, not at the camshafts. 
3. Turn crankshaft at the pulley clockwise  to the overlapping TDC of cylinder 1  . Using a locating pin 9595/1  fix the pulley or vibration balancer.
   Fig 2: Identifying TDC Marking On Pulley

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4. The smaller cut-outs at the grooves of the inlet and outlet camshafts -arrows-  must point to the cylinder head cover. Check the position using the adjusting gauge 9686  .
   Fig 3: Locating Inlet/Outlet Camshafts

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   Fig 4: Adjusting Gauge (9686)

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Information 

   • Before disassembling the cylinder head cover, the central screw on the camshaft adjusting device must be unscrewed  .
5. Unscrew the central screw on the camshaft adjusting device.
   1. 5.1. Retaining tool 9685  must be positioned on the hexagon of the adapter and the contact block placed as a counter on the fitting bore of the cylinder head cover for the oil suction pump; if necessary, position the contact block by undoing and tightening the screw.
   2. 5.2. If the special tool cannot be positioned on the hexagon of the adapter in this way, the engine must be turned further in the direction of rotation at the pulley of the crankshaft until the contact block comes into contact with the central screw of the cylinder head cover, ready for unscrewing. Unscrew the central screw.
      Fig 5: Identifying Central Screw On Camshaft Adjuster

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6. Remove cylinder head cover → Removing Cylinder Head Cover  .
7. Release the four Torx screws M6 x 16 on the sprocket of the respective outlet camshaft. Do not remove the sprocket.
8. Remove chain tensioner for cylinders 1-3 -arrow-  .
   Fig 6: Identifying Chain Tensioner For Cylinders

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9. Unscrew guide rail screw M6 on pulley side (hexagon socket a/f 5).
10. Unscrew four Torx screws for outlet camshaft sprocket. Lift timing chain off sprocket and remove the sprocket. Lay timing chain on the mounting tab for the sprocket.
11. Remove the four camshaft thrust bearings and the guide rail. Unscrew eight Torx screws, six M6 x 35 -1-  , two M6 x 40 -2-  (screws for guide rail). Lift the thrust bearing and the guide rail carefully off the bearing surfaces and the timing chain.
    Fig 7: Locating Camshaft Bearing Cover And Guide Rail

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12. Remove the camshafts. Remove outlet camshaft, lift timing chain off the camshaft adjuster of the inlet camshaft and remove the camshaft. Lay the timing chain in the chain housing in the cylinder head.

    Cylinder side 4-6: 

    Information 

    • The engine must be always turned clockwise (running direction of engine) during assembly work on the timing drive mechanism. 
    • Only turn engine using the crankshaft pulley, not at the camshafts. 
13. Turn crankshaft at the pulley clockwise  to the overlapping TDC of cylinder 4  . Using a locating pin 9595/1  fix the pulley or vibration balancer.
    Fig 8: Identifying TDC Marking On Pulley

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
14. The smaller cut-outs at the grooves of the inlet and outlet camshafts -arrows-  must point to the cylinder head cover. Check the position using the adjusting gauge 9686  .
    Fig 9: Locating Inlet And Outlet Camshafts

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Fig 10: Adjusting Gauge (9686)

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
15. Unscrew central screw for camshaft adjuster element analogous to that for side 1-3.
16. Unscrew four Torx screws for outlet camshaft sprocket. Do not remove the sprocket.
17. Remove chain tensioner for cylinders 4-6 -arrow-  .
    Fig 11: Locating Chain Tensioner For Cylinders

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
18. Unscrew guide rail screw M6 on pulley side (hexagon socket a/f 5).
19. Unscrew four Torx screws for outlet camshaft sprocket. Lift timing chain off sprocket and remove the sprocket. Lay timing chain on the mounting tab for the sprocket.
20. Remove the four camshaft thrust bearings and the guide rail. Unscrew eight Torx screws, six M6 x 35, two M6 x 40 (screws for guide rail). Lift the thrust bearing and the guide rail carefully off the bearing surfaces and the timing chain.
21. Remove the camshafts. Remove outlet camshaft, lift timing chain off the camshaft adjuster of the inlet camshaft and remove the camshaft. Lay the timing chain in the chain housing in the cylinder head.