Engine Components: Camshaft

The tooth-roller type chain, which was first introduced on the N63 engine, is used for the camshaft drive. Only its length is different. The tooth- roller type chain combines the advantages of a tooth type chain and a roller type chain to provide high resistance to wear and low noise.

The chain tensioners, tensioning rails and slide rails are common components for both cylinder banks.

In contrast to the N63 engine, the N74 engine is once again disconnected at cylinder 1 firing TDC. However, the same special tool is used to disconnect it. It is placed on the torsional vibration damper and forms the reference point for the alignment pin with respect to the crankcase.