Cayenne Turbo (9PA) V8-4.8L Turbo (2008)
Information
The valves cannot be touched up afterwards.
The valves can be ground using commercially available valve grinding paste.
1. Apply a small a fit of valve grinding paste to the valve seat.
2. Oil the valve stem of a new valve and insert it into the valve guide from the combustion chamber. Push the valve in until it is seated securely in the
valve seat of the cylinder head.
3. Grind in the valve using the commercially available valve grinding tool (with rubber suction cup) by means of rotary movements. To do this, hold
the valve grinder between the palms of both hands and press against the valve seat with rotating movements.
Grinding the valve seat
4. Carry out the grinding operation for each valve that is replaced. Check for leaks using some fuel and installed spark plugs. The fuel must not
escape through the valve seat. Carefully remove valve grinding paste.
5. Fit valve lock.
Locking valves
6. Replace valve-stem seals.
7. Fit valve springs, concave washer and valve keys. To do this, place valve springs (there are two in the exhaust valve in the turbo engine) on the
bottom concave washer. Place top concave washer in position.
Information
The mechanic must practise for use of the assembly cartridge to be effective. Some repetitions must be made to ensure that the valve keys are correctly
held in place.
8. Insert valve keys into the assembly cartridge.
8.1.
Press the spring washer of the assembly fixture downwards -1- and insert the valve key -2- with the narrow end pointing downwards.