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 left side (N63)"
Position special tool 11 9 893 on inlet and exhaust camshafts.
Special tool 11 9 893 must rest without a gap on cylinder head; if necessary, adjust camshaft at hexagon heads.
Screw special tool 11 9 894 into cylinder head.
Position special tool 11 9 892 on special tool 11 9 893.
Both special tools 11 9 893 are secured with special tool 11 9 891.
Note: Tighten down special tool 11 9 891 by hand.