Gaskets, Sealing Rings And Bellows
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Always replace sealing rings and bellows.
After removing gaskets, examine the contact surfaces on housings for burrs and damage.
Always loosen and tighten screws or nuts in diagonally opposite sequence for mounting covers and housing.