Adjusting Camshafts (Timing)

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Information

Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:

Torx screws: (E..) for external Torx, (T..) for internal Torx.
Hexagon-head bolts (internal and external hexagon): Wrench size (a/f)

Information

Unlike older GT3 engines, the camshafts are set to the ignition TDC position of cylinder 1.
Both cylinder banks can be set at the same time.

Check camshaft position.
1. 1.1. The cams on cylinders 1 and 4 must be positioned as follows:
2. 1.2. Ignition TDC of cylinder 1: cams on the outlet and intake camshaft of cylinder 1 are facing outward at a slant.
  
  Fig 1: Identifying Cam Positions Of Cylinder 1 At Ignition TDC
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 1.3. Overlap of cylinder 4: cams on the outlet and intake camshaft of cylinder 4 are facing away from each other (downwards at an angle towards the cylinder head wall).
  
  Fig 2: Identifying Cam Positions On Cylinder 4 At Overlap
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Information
- Tighten the screws for the adjustment device only slightly. It must be possible to move the frame easily by hand.
Fit plates of the Adjustment Device 9661 to the camshaft housing sealing face on both cylinder banks using two M6 x 25 screws on each plate.
1. 2.1. Screw in the screws -arrows- by hand.
  
  Fig 3: Locating Screws
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Insert the retainer springs 9661/5 into the frame according to the markings and secure them using two locating screws on each spring.
Only insert the retainer springs as far as required so that the camshafts can still turn!
1. 3.1. Adjustment Device on cylinder bank 1-3:
  1. Plate 9661, cylinders 1-3
  2. Retainer spring 9661/5 for intake camshaft for cylinders 1-3
  3. Retainer spring 9661/5 for outlet camshaft for cylinders 1-3
  4. Locating screws
    
    Fig 4: Identifying Adjustment Device (9661) On Cylinder Bank 1-3
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 3.2. Adjustment device on cylinder bank 4-6:
  1. Plate 9661, cylinders 4-6
  2. Retainer spring 9661/5 for intake camshaft for cylinders 4-6
  3. Retainer spring 9661/5 for outlet camshaft for cylinders 4-6
  4. Locating screws
    
    Fig 5: Identifying Adjustment Device (9661) On Cylinder Bank 4-6
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Information
- When loosening or tightening the camshaft actuators, a second person must counter with the relevant retaining tool.
- The camshafts are set with the standard chain tensioners.
Set the camshafts.
1. 4.1. Turn the camshafts at the hexagon as required using an open-ended wrench (a/f 30) -1- until the retainer springs -3- slide easily into the slots on the camshafts.
  
  Fig 6: Turning Camshaft
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 4.2. The dowel pins -3- on the retainer springs -2- must also fit into the relevant additional slots on the camshafts -arrows- .
  
  Fig 7: Locating Dowel Pins On Retainer Springs
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 4.3. Secure the retainer springs using the hexagon-head bolts.
Fit dial gauge in order to determine the top piston position correctly.
1. 5.1. Secure a dial gauge on cylinder 1 using a universal dial gauge holder.
2. 5.2. If necessary, extend the probe of the dial gauge until you can definitely take measurements on the piston crown.
  
  Fig 8: Fitting Dial Gauge
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
To set the timing, the piston for cylinder 1 must be positioned exactly at TD C.
1. 6.1. To do this, turn the crankshaft clockwise from the 60° position ahead of TDC using the pulley until the maximum defection (reversing point) is attained on the dial gauge.
2. 6.2. At the same time, the second TDC marking -2- must be aligned with the joint on the crankcase -arrow- at the crankshaft pulley.
  1. First marking for cast lug on unit carrier
  2. Second marking at joint
    
    Fig 9: Locating TDC Marking On Pulley (Shown On Partly Disassembled Engine)
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Pre-tighten central screws on the camshaft actuators. Counter at the hexagon of the relevant camshaft using a long open-ended wrench (a/f 30).
1. 7.1. Initial tightening of camshaft actuator on intake side: hexagon-head bolt, M12
  1. Plate 9661 with retainer springs 9661/5
  2. Open-ended/ring wrench, a/f 30
  3. Torque wrench
    
    Fig 10: Tightening Of Camshaft Actuator On Intake Side (View Of Cylinder Bank 4-6)
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 7.2. Initial tightening of camshaft actuator on outlet side: internal serration screw, M12
  1. Plate 9661 with retainer springs 9661/5
  2. Open-ended/ring wrench, a/f 30
  3. Torque wrench
    
    Fig 11: Tightening Camshaft Actuator On Outlet Side (View Of Cylinder Bank 4-6)
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  → Initial tightening: 50 Nm (37 ft. lb.)
The retainer springs 9661/5 must always be pulled out of the camshaft slots during the final tightening procedure.
Tighten central screws (M12 x 130) on the camshaft actuators using a torque angle wrench -1- . Counter with the prescribed tools.
1. 9.1. Final tightening of camshaft actuator on intake side:
  Hexagon-head bolt, counter with a long ring wrench (a/f 30) -2- .
  
  → Torque angle: 110°+/-5°
  
  Fig 12: Tightening Intake Camshaft Actuator (Cylinder Bank 1-3)
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 9.2. Final tightening of camshaft actuator on intake side: Internal serration screw, counter with holding wrench 9653/2 -3- .
  → Torque angle: 140°+/-5°
  
  Fig 13: Tightening Outlet Camshaft Actuator (Cylinder Bank 1-3)
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Check camshaft adjustment.
1. 10.1. Turn engine at the crankshaft pulley twice through 360° in a clockwise direction and set exact TDC position using the dial gauge.
2. 10.2. Retainer springs 9661/5 must be positioned in the adjustment device and pushed into the camshaft slots.
3. 10.3. If set correctly, the retainer springs and dowel pins will slide easily into the camshaft slots.
4. 10.4. If the retainer springs do not fit, the adjustment procedure must be repeated.
5. 10.5. Remove tools.
Cylinder bank 1-3 only: Install driver for vacuum pump using special tool dowel sleeve 9826 -1- .
Use new screws!
1. 11.1. Remove protection cap -2- and position dowel sleeve over the hexagon piece on the central screw.
  1. Dowel sleeve
  2. Fit protection cap immediately after using the dowel sleeve
  3. Fastening screw for protection cap
    
    Fig 14: Identifying Dowel Sleeve 9826
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 11.2. Fit driver -1- and secure with two new internal Torx screws (T30, M6 x 55) -2- .
  
  Fig 15: Identifying Driver And Torx Screws
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 11.3. Initial tightening:
  → Initial tightening: 10 Nm (7.5 ft. lb.)
4. 11.4. Final tightening:
  → Torque angle: 120°