Cayenne Turbo (9PA) V8-4.8L Turbo (2008)
Valve keys inserted
7. Place the valve key assembly cartridge onto the cylinder head (same as removal of valve) and position it on the top spring plate.
8. Press the assembly cartridge with the lever (assembly bar) against the force of the valve-spring and keep pressed. The knurled screw moves
forward. When doing so, turn the knurled screw back and forth until the valve keys snap into place. Repeat as required.
Install valve keys
9. When installing the valve keys, check their correct positioning.
10. Replace all four valve-stem seals for a cylinder and refit valve keys. Only then fit compressed-air hose on the next cylinder and apply compressed
air constantly.
Subsequent work
1. Install hydro-tappets. Do not confuse components.
2. Install camshafts.