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On the slog home I came up with a method in my head to at least check the cam timing without removing the vanos. Feel free to shoot holes in it.
The method, not my head.
Under the assumptions:
A) You have the head cover off, plugs out, and whatnot, because you just completed a valve adjustment.
B) You can't see the position of the splines and vanos pistons with the vanos installed.
C) The alignment pins on the tool should drop into the holes in the camshafts with the vanos pistons at the center of their available travel.
1) Turn the crank to #1 TDC and pin it.
2) Using the thin 24mm wrench, turn the camshaft CW as far as it will go. Presumably the vanos piston bottoms out.
3) Set the alignment tool up on the head and drop the pin in. It won't go through the hole.
4) Make a Sharpie mark where the alignment pin hits the camshaft.
5) Pull the pin and turn the camshaft CCW as far as it will go. The vanos piston is now at the other end of its travel.
6) Make a Sharpie mark where the alignment pin hits the camshaft.
7) The Sharpie marks should be evenly spaced about the camshaft alignment hole.
8) Repeat for other camshaft.
Coming: What to do if the marks are not evenly spaced, without removing the vanos.
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