Thats why I was asking if it had been disturbedThe hole in the top of the timing chain cover is actually on the opposite side to the exhaust:
http://www.realoem.com/bmw/showparts...57&hg=11&fg=10
But as the engine is cranked its possible it could run down the exhaust side. If you 'just' take the timing chain cover off, you wont be able to get at the joint between the top surface of the HG and the head. I ended up putting a smear of sealant on both sides of the HG round that hole and all was well. Hopefully my experience is totally irrelevant and someone else will chime in with an easy fix.