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Hi all, new to the forum and my first post. I have a 2007 330d M Sport Coupe and recently had the serpentine belt changed due to failure. Problem I now have is that every time I replace the belt, the tensioner bolt fails. It's a new tensioner so can't work out why. Any help please.
 

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Maybe the thread in the block is stripped? And have you checked that no belt debris was sucked in to the crankshaft front seal when the belt failed?
 
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