I have no experience with n62 but I did tear a b58 valvetronic head apart completely (and put it back together). You should be able to turn the motor with a 4 mil hex key back to the limit position so the shaft is all the way disengaged. It should be fairly hard to turn counterclockwise as it's pushing the lever down, and then a little easier to turn clockwise and then at the very end it should spin clockwise really easily as it all lets go. There's also a service function to teach in the limit positions.

Interestingly I could only get 90 PSI on the compression check with the b58 that was hurt. I borrowed my neighbor's gauge and same thing. The factory manual says to put the accelerator pedal to the floor, but it didn't make any difference. I could never figure that out.

I think you might be out of time. When I did the timing on m52 I followed the directions but it didn't sit flush on the intake side. Repeat everything the same way and then it sat flush, don't know.. I also screwed the timing up on my Honda d16, it ran poorly and smoked bad, off a tooth.

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'05 E53 3.0 6mt
'17 F30 340ix 6mt
'96 E36 328is, in progress