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LTR 330HP - New serpentine belt is really tight

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  • LTR 330HP - New serpentine belt is really tight

    I replaced the alternator and serpentine belt on my 2000 X-Star LTR

    The alternator casing/posts are the same size, but the serpentine belt was pretty hard to get on. I ordered the OEM replacement belt from Bakes:

    https://www.bakesonline.com/indmar-7...craft-efi.html


    Is a new belt supposed to go on really tight? I imagine it would loosen up a little bit after running for a few hours and getting warm.

    Also, is there a way (or a need) to adjust the belt tensioner? I had to force it all the way down with a socket wrench and even then, I needed a second hand to pull the new belt into place.

    My overall concern is either the belt being too tight and snapping right away or the high tension causing stress/bending on the alternator pulley.


    FWIW I started the engine in the driveway for a couple minutes and everything LOOKS just fine (alternator putting out 14.4v at idle )

  • #2
    It'll take some effort to turn the belt tensioner far enough to slide the belt on. I just did mine, it was a bit of a pain. My belt did slide on fairly easily though. As far as loosening, a belt shouldn't stretch much, if at all. All of the tension adjustment comes from the tensioner.
    I know you've got it back together, but if you can pull the belt and compare it to the old belt, that will tell you if it's the right length. At a minimum, compare the belt numbers on the old and new. I've bought belts before that had one belt number on the package, but a completely different number on the belt itself. Someone must have bought two belts, returned one in the wrong package. Maybe that happened to you?

    G

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    • #3
      Reverify routing as well. I've seen applications where one idler would sort of work two ways

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      • #4
        Originally posted by 88 PS190 View Post
        Reverify routing as well. I've seen applications where one idler would sort of work two ways
        I dont quite follow this. Can you elaborate?

        I turned the engine on and ran it for 5 min. Looked just fine.

        My only concern is if its possible that the tensioner applies "too much" tension and stresses the alternator shaft or the belt itself.

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        • #5
          Originally posted by gweaver View Post
          It'll take some effort to turn the belt tensioner far enough to slide the belt on. I just did mine, it was a bit of a pain. My belt did slide on fairly easily though. As far as loosening, a belt shouldn't stretch much, if at all. All of the tension adjustment comes from the tensioner.
          I know you've got it back together, but if you can pull the belt and compare it to the old belt, that will tell you if it's the right length. At a minimum, compare the belt numbers on the old and new. I've bought belts before that had one belt number on the package, but a completely different number on the belt itself. Someone must have bought two belts, returned one in the wrong package. Maybe that happened to you?

          G
          Im going to confirm with Bakes that the replacement belt is in fact the right OEM replacement.

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          • #6
            On the belt tensioner, there should be some reference marks thinking 3 and a triangular pointer, indicating if the belt is to tight, just right, or at its wear max point. A tight belt is not a good thing, no room for the tensioner to absorb sudden engine loads, wear stress on brackets, belts, bearings...all else fails, measure the belt and find two or 3 slightly longer. Use the belt that fall into the just right spot on the tensioner indicator, its there if you look.

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            • #7
              All I was saying, occasionally you can go the wrong way around a pulley and still be about the same fit/very close.

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              • #8
                Jamis0n, How did your resolution turn out? I ask because this last weekend, the bracket bolt holding the alternator sheared and I am replacing the belt along with the bolts securing the bracket and alternator. As I put on the new belt, mine was also too tight. I am 99% sure the routing is correct, per 88 PS190's comment.

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