Cayenne Titanium (9PA) V8-4.5L (2006)
Valve Guide Seal: Overhaul
WM 156319 Removing and installing valve-stem seal
Preliminary work
Preliminary work
Information:
The cylinder head can remain fitted while this work is carried out.
1. Remove engine.
2. Remove camshafts on both cylinder banks.
3. Take flat-base tappets out of the cylinder head and lay them on a clean surface, arranged according to cylinders and valves. Do not interchange
components.
Information
Component overview
In the Turbo, the exhaust valve is fitted with internal and external valve springs and adapted concave washers (different to those shown in the figure
below). The exhaust valve in the turbo engine has the same dimensions as the exhaust valve in the naturally aspirated engine; because of the sodium
filling it is lighter however and when obtained as a spare part it features a colored dot to distinguish it. For further details, please see later chapter
entitled "Valve dimensions".