Serpentine (Drive) Belt keeps coming off

Belt Tensioner
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Idler Pulley
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Belt:
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TOOLS:
Milwaukee 2767-20 M18 FUE High Torque 1/2” Impact Wrench with Friction Ring (Tool Only)
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US:
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Milwaukee 18V 1/4 Inch Lithium Ion Hex Impact Driver
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3/8-Inch Drive Click Torque Wrench
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1/2-inch Drive Click Torque Wrench
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[@mcarten5884]

pointed straight to the issue I was having

[@justdoityourself]

Happy to help!

[@stanciemerych1448]

My daughter's '07 Fusion, with the Duratec 2.3 (similar tensioner as in the video) has the same issue. We had already decided on replacing the tensioner pulley, but this helps confirm it. The new belt, too, was slipping off, though the old one didn't.

[@justdoityourself]

Sounds like exact same issue. Note, you will need entire new tensioner, not just a pulley.

[@oneundecided]

Thanks for this video, I have a Dodge Grand Caravan 2007 with a 3.3L engine and the serpentine belt was jumping up from time to time, it seems like something in these pulleys creates a drag force when starting the engine, so the engine shakes randomly and the belt jumps out. The power steering pump was replaced when I first saw this problem 4 years ago. However, this does not happen all the time. I do not think that it is a tensioner issue, as it is very stiff to rotate - good spring.

[@justdoityourself]

When the engineer starts, it creates the highest tension on the belt and tensioner (when fluids are cold, it is even higher) and that's when tensioner gives up.

[@timothydetwiler313]

My serpentine belt is coming off of my water pump Pulley !!, it sites a little off the water pump pulley and then comes off about 15 minutes after the car is running !!, I'm assuming that the water pump or the water pump pulley is bad !! . I have a Ford fusion 2.5 l .

[@justdoityourself]

Thanks for your question! Interesting... Considering 15 minutes time range, try if there is any play on water pump pulley. If there is no play replacing water pump pulley is probably your best bet. If there is a play you would need new water pump. Please let me know what you figured. Good luck!

[@malacefromthepalace5657]

Mines to keep slipping off every time

[@tawannafoster311]

Same problem ford fusion