Timing Component Alignment Marks: Locations
The procedure for "Checking Camshaft Timing" can be found under Camshaft, Engine Testing and Inspection
The following is taken from "Adjusting camshaft timing on right side (N62 / N62TU)"
11 31 573 Adjusting Camshaft Timing on Left Side
11 31 574 Adjusting Camshaft Timing on Right Side
Place special tool 11 9 461 on inlet camshaft and align inlet camshaft so that special tool 11 9 461 rests without a gap on cylinder head.
Fit special tool 11 9 463 11 9 460 Gauge, secure screw (1) in thread for oil line and tighten down by hand.