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8.1 Serpintine belt

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Does anyone on here have an 8.1? July 4th (of course) we were driving boat from our bay across the lake for breakfast. Boat ran fine (247RX). About halfway there Alarm for low battery came on 11.5 volts. Being used to Merc engines the 1st thing I did was check the engine temp. Was at 160 so I thought maybe the alternator was going bad. Made it back to my dock puled the cover and saw the serpinetine belt laying in the bilge. It was shreddd up but still in one piece. Being a holiday and a Sunday there was no way to get one. Got 1 today so I will put it on tonight.

Now the question... all pulleys are free and working fine alt spins easily and everything looks aligned. Why would the belt suddenly fall off like this? The boat is an 07 with low hours so I don't think it is too old. Any suggestions?



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