The photo in the OP is the mechanical tensioner.
Originally Posted by NickD
Is there an easy way to know if you have a hydraulic or mechanical tensioner without getting down in there? I have 120k on my pullies and oddly none of them are making any sound as of yet. I am doing my water pump soon and figured I'd replace these as well.
You can't get a replacement pulley for the mechanical tensioner anyway. There's no part number for it hence BMW doesn't sell it. You'd have to buy the whole hydraulic set if you want to change it.
For the hydraulic tensioner, the pulley is replaceable (11-28-1-748-131).
Last edited by ssm1991; 05-13-2008 at 03:21 AM.