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      01-31-2018, 05:19 AM   #3
bung206
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Drives: E82 135i MSPORT
Join Date: May 2016
Location: Australia

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What fails on the tensioner pulley? Does it cause the belt to mis-align slightly causing heat (and wear)?

My tensioner pulleys are slightly melted (one more than the other), but there was nothing obviously wrong with the tensioner when I pulled the old one out. The old tensioner's rubber gasket (The one that goes between the bolt and the engine block) had completely failed and was in pieces. It was still tightly secured to the engine though... so it's not like it was loose or rattling around or anything - and it definitely wasn't at max tension either.

Keen to get to the bottom of it to see if there's anything that can be done to avoid a repeat of this.
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