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Thread: Serpentine belt/tenionser

  1. #1
    Nothing but a Thing MSJKU11's Avatar
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    Serpentine belt/tenionser

    Quick question. Belt popped off and replaced it and after about 5 minutes of driving the new belt popped off. Pulleys look good, everything moves freely. Thinking the tensioner is bad. Anything else to look for?

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  2. #2
    Fresh Catch
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    Pull on the belt itself. Is there good spring tension? Maybe the idler?

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  3. #3
    Meme King WJCO's Avatar
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    Check for play in the pulleys by rocking them. I bet one of them is loose.
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  4. #4
    Hooked rmilobrown's Avatar
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    I just replaced the belt on my 2015, I read that some aftermarket belts can be long. Did you buy MOPAR?

  5. #5
    Nothing but a Thing SDG's Avatar
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    My belt popped off. The actual bolt that holds the tensioner to the block was loose... as in 2 turns on the bolt to be finger tight. Check the entire assembly for play with the belt off.

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  6. #6
    Nothing but a Thing MSJKU11's Avatar
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    Quote Originally Posted by pedrosanchez1973 View Post
    Pull on the belt itself. Is there good spring tension? Maybe the idler?

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    I pulled on the belt and had good tension. Runs idle just fine but when I drive it then it pops off after about 5 minutes

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  7. #7
    Nothing but a Thing MSJKU11's Avatar
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    Quote Originally Posted by WJCO View Post
    Check for play in the pulleys by rocking them. I bet one of them is loose.
    I played with the Pulleys and they all seem tight. The bolts are all tight also.

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  8. #8
    Addict jeeeep's Avatar
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    do you till have the original belt? if so, compare the measurements.

    not all aftermarket belts are the same length, I went thru this a while back and found as +/- 1/2" variance in the actual belt length.

    I replaced the tensioner and idle pulley before I finally looked at the tension pulley and could see play in the belt as it was too long for the tensioner to take up proper slack. the slack was making a slapping sound on the backside of the tensioner.

    Next belt I bought, different brand, same auto parts store, also specified for my jeep was too short and whined like a pig because it was too tight.

    If you're still stock (no hydro assist etc...) get I'd get a Mopar belt.

    Another thing to check is the pulley alignments. Make sure they are spinning true.

    On my 2010, the idler pulley had a slope to the outer edge that allowed the belt to 'walk' off if any of the pulleys are out of alignment.

  9. #9
    Meme King WJCO's Avatar
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    See if the belt comes off when ac is on or during a hard turn. You could have an AC compressor locking up or something going on with steering pump under load. If all is tight, you likely have a bad tensioner. I agree to check the belt length too.
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  10. #10
    Nothing but a Thing MSJKU11's Avatar
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    Here is what I observed. The belt looks like it comes in at an angle to the tensioner from the crankshaft. When I crank it, the tensioner moves backwards then forwards and the belt pops off the crankshaft pulley.

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