Move camshafts, chain and tensioning element of cylinder bank 4 - 6 to basic position or installation position.

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The lug of the camshaft position sensor cover or the groove on the inlet camshaft must face downward. The dotting marks must face upward.

Fig 1: Identifying Groove On Inlet Camshaft & Dotting Marks On Camshaft
Courtesy of PORSCHE OF NORTH AMERICA, INC.

Fig 2: Identifying Camshaft
Courtesy of PORSCHE OF NORTH AMERICA, INC.
NOTE:
- The rotor cover for the camshaft position sensor is no longer installed in vehicles without M660 (OBDII) or M661 (more demanding emission concept).
Put on and fit chain as described for cylinder bank 1 - 3.

Fig 3: Aligning Colored Links On Chain With Dot Marks On Camshaft - Cylinder Bank 4- 6
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Completely assembled and ready for installation. Do not remove the tensioning screw, special tool 9632 (with right-hand thread) or 9632/1 (with left-hand thread) until the bearing saddles and the chain tensioner have been fastened on the cylinder head. If allocation is correct, the groove or lug of the camshaft position sensor housing faces downward.

Fig 4: Ensuring Groove Or Lug Of Camshaft Position Sensor Housing Faces Downward
Courtesy of PORSCHE OF NORTH AMERICA, INC.
NOTE:
- Modified tensioning element (VarioCam) as of June 1999. The tensioning screw has been changed to a left-hand thread. Can be identified by the index (57) in the area of the guide rails.
Introduction as of engine number:

96/01 66X13484 for the C2

96/02 68X06737 for the C4

Fig 5: Identifying Tensioning Element Of Cylinder Bank 1 - 3
Courtesy of PORSCHE OF NORTH AMERICA, INC.

Relieve using new special tool 9632/1 (with left-hand thread)