Tystr6

Tyler Hancock

New Member
Sep 15, 2019
2
Boat Info
2004 390 twin 8.1 gas
Engines
8.1 horizon
390 at river.JPG 2004 390 8.1 Gas Dancer
Any one know why serpentine belt will not turn but engine will start? Something is locked up.???...new member, not sure i am doing this right?
390 at river.JPG
 
If the engine will start, have someone start it while you are looking at the serpentine belt (looking at; not holding!) One of the pulleys or idlers is probably frozen. The idler is easy.......replace it. It could also be the engine circulating water pump or the alternator
 
I guess i will pull off the belt next weekend and see what will not rotate?
 
Be careful, belts on a running engine are not something to mess with. But like others have said, likely one of the pulleys is not turning. I would expect there to be some squealing noises and black dust coming off the belt around the problem pulley.
 

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