Do you have the tensioner pinned opene with the locking pin so you can take your time?

If so I've found with my 35i i have to get the belt onto all the pulleys with lips first then over a smooth pulley last. Also, it's pretty easy to invent an alternate path for the belt are you 100% sure you're going the right way?

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)