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Old 09-12-2011, 10:35 AM   #4
kenmar
3rd Gear Member
 
Join Date: Apr 2005
Location: Toronto
Posts: 345
It's not the tensioner, it's the tensioner pulley. Mine did that for a couple of weeks and then it disintegrated as I pulled into my driveway. Lucky for me because I lost power steering once it blew.

I had the old mechanical tensioner, but the dealer no longer sells these. I paid $250+ for the hydraulic assembly from the $tealer. The mechanical one is still sold with pulley at Autopartsway for $45. The hydraulic one from Bimmerspecialist is about $140 (tensioner + pulley set). The mechanical and hydraulic ones are interchangable, although I think the latter is supposedly more reliable.
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