Procedures

Completing camshafts

Preassemble camshafts

The inlet camshaft, exhaust camshaft, tensioning element (VarioCam) and chain must be preassembled before installation in the cylinder head.

Camshaft allocation











Allocating tensioning elements

Identification for cylinder bank 1 - 3:

A - Cyl. 1 - 3
B - Solenoid valve surface color black





Identification for cylinder bank 4 - 6:

A - Cylinder bank 4 - 6
B - Solenoid valve surface color grey





Move camshafts, chain and tensioning element of cylinder bank 1 -76,20 mm to basic position or installation position.

1. Place the inlet camshaft and exhaust camshaft on a soft surface. The lug of the camshaft position sensor cover or the groove on the inlet camshaft and the dotting marks must face upward.





2. Place chain on the drive sprockets of the camshafts. The colored outer lugs of the chain must face the dotting marks.





3. Fit tensioning element.





3.1 Press slide rails together and push upward.





3.2 Lift inlet camshaft and insert tensioning element from the front.
3.3 Fit chain; when doing so, observe clearance between the gear wheels and the lower slide rail.








4. Completely preassembled and ready for installation. Do not remove the tensioning screw, special tool 9632, 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 face upward.





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





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





Information
^ The rotor cover for the camshaft position sensor is no longer installed in vehicles without M660 (OBDII) or M661 (more demanding emission concept).





2. Put on and fit chain as described for cylinder bank 1 - 3.





3. 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.

Information
^ 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





Illustration shows tensioning element of cylinder bank 1 - 3





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