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I recenty bought and installed new vanos seals from Beisan systems. I looked over the DIY and it says nothing about having to have top dead center, at least i did not see it anywhere. Reading over my manual earlier, it says to be sure that you have TDC before taking off your vanos. ANybody not have TDC when they switched vanos seals?
 

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If your engine uses a double piston VANOS, that is not necessary since you are not loosening the timing belts. So, you can just unscrew the two left-hand-threaded Torx bolts affixing the pistons to the camshafts and carry on, just don't start or crank the engine before reinstalling the VANOS.
 
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