911 Carrera S Cabriolet (997) F6-3.8L (2007)
3.1.
Overlapping position of cylinder 1: The cams must be facing downwards at an angle to the cylinder head wall -arrows-.
Cam position on cylinder 1 at overlap
1 - Outlet camshaft 1-3
2 - Intake camshaft 1-3
3.2.
Overlapping position of cylinder 4: The cams are facing each other and are at a slight angle with respect to the spark plug recess -arrows-.
Cam position on cylinder 4 at overlap
4. Remove central screws on camshaft timing gears.
Central screws on camshaft timing gears
5. Loosen internal Torx(R) central screw (T55, M12 x 1.5 x 60) on the outlet sprocket. To do this, counter with special tool holding wrench 9775 -1-.