Originally Posted by eldoble
was wondering what can happen if i have a "crooked belt tensioner"? But I took it for an inspection recently (independent BMW mechanic) and was told that I have a "crooked belt tensioner". What types of symptoms, if any, should i expect to see from this? What can happen if I do not get this fixed asap? How can i check and verify this myself?
It would cause increased belt wear and pre-mature belt failure -- that could leave you stranded somewhere, and could, outside chance, damage the A/C compressor.
Check that the belt is running in a flat plane between all the pulleys, and the tensioner is not forward or back. Look for wear on the edge of the belt. A couple of people have reported broken mounting bolt on the tensioner, look for that. See the above thread for details and photos.