BMW N62 Series Service Training page 53

New Generation N62 Engine
Fig. 31: Photograph of the valve lift adjustment device
The drag lever rollers on the N62 engine are made from sheet
metal (they are made from high-quality cast steel on the N42).
The intake valve lift can be adjusted to anywhere between
0.3 mm and 9.85 mm.
The mechanical function of the Valvetronic system is the same
as that of the N42 engine, and has already been described in
this documentation.
Note
The cylinder heads are precision mounted together work side to
ensure precise and uniform distribution. The valve gear
components on the intake side are precisely matched to one
another.
The bridge support and the lower eccentric shaft and inlet
camshaft bearings therefore work together in the cylinder head
once fitted, to the tightest limits.
If the bridge support or the lower bearings are damaged, the
entire cylinder head must also be replaced.
© BMW AG, Service Training
Course Contents/Background Material
KT-6733
Chapter 3 P.41