I've been in Germany for the past six months and just got home. I was very excited to finally drive my X that my sister-in-law has been driving and notice the obnoxious noise you are describing. I have tracked it down to the alternator pulley on the crankshaft. The other two pulleys on the crank are tight but not the third.

And now for my problem...my X manual is on my desktop computer in Germany, but I need to do some work on it now. Anybody have a page or two of the manual they could email me to show how the crank comes apart?

This really sucks. I thought I could go wheeling while I was back, but am instead fixing my truck...

If it's not to complicated I'll do myself, although my X still has the powertrain warranty so I could get the dealer to do it.