on the right hand passenger side; specifically the alternator spring loaded bolt?

http://www.realoem.com/bmw/showparts...17&hg=11&fg=18

Is it supposed to be loose or should it be threaded into the tensioner?

 

Hope this helps--30mm bolt is tight and is pivot point for Tensioner.

 

Thanks very much; the spring loaded looks just like mine.... I'm trying to pin-point the famous RPM related high pitched sound.....

So I decided to take the right wheel off, and then the wheel well covers to see if it's nearer the alternator or to the left.. and it's to the left. Attached in the image is where the sound may be coming from (the sound is coming from the left side of the crank pulley, or perhaps the crank pulley itself.)...

I'm still new to the car; so the alternator is on top of the a/c unit? Then left to the crank is the water pump then the power steering unit is at the very left?

 

That must have been a lot of work, taking your engine out, just to get that photo...

 

I hope my post wasn't implying that

 

Power steering is electrically assisted so not sure what that thing in the far left is...