This video shows how to replace the belt and tensioner on a BMW 3 Series E90 with the N51 or N52 6 Cylinder Engine. It is common for the belt tensioner to begin to walk off the belt when it is failing. The bolt holding the tensioner in place is aluminum, which is a one time use bolt. It needs to be torqued down and a torque angle applied.
BMW 3 Series E90 Belt And Tensioner Replacement DIY
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