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Serpentine Belt fell off - LS1

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Hi All,  I was testing my boat today and all seemed well but about 10 minutes into it my engine temp jumped to 230 and I shut it off.  I opened the engine cover and saw the serpentine belt fell off.  I put it back on and my engine temp dropped back down.

What would cause it to fall off ?   Tensioner?  old belt ?   How can I diagnose ?




Edited by SkiPablo

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I would check both the tensioner and the alternator bearings. 

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