Alt. belt issue...open 4 sugestions here
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Alt. belt issue...open 4 sugestions here

  1. #1
    Senior Member H20MOFO's Avatar
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    Default Alt. belt issue...open 4 sugestions here

    Long story short..all last season I tossed a alt. belt 1 time. Right out of the boat. Bought a new belt...end of problem. Every thing is fine all year until a few weeks ago. A couple of hours into the day I glance at the gauges...no alt belt.....drive back to the dock and put it on. It gets tossed again before I can even get on plane. So I come home and give it a bath because the belt is a little oily from laying in my bigle. Next trip out ...no problem....get home and look. The f'n belt is on upside down I flipped it back. Fast fwd to last night....rejetted the carb....wanted to make sure I had no fuel leaks. I started the motor, turned it off....and the f'n belt flipped on me again. I am about to just leave it.lol Any insight here?
    Another Hot Boat refugee

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    Put a straight edge on the 2 pulleys to see if the alignment has changed.
    No more Mr. Nice Guy !

  4. #3
    "BOATLESS" blender over's Avatar
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    i believe once the belt flips on you one time then it will always flip on you.
    the belt has a memory of sort.
    get a new belt.

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    Senior Member lbhsbz's Avatar
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    LOL...I always brought about 8 extra belts with me....and used them all, every weekend I ran my boat last year....mine use to pitch belts when the motor hit the limiter.

    Get a straight edge and check the pulley alignment in several places....top to top and bottom to bottom, then criss cross.

    Make sure the alternator isn't moving around....the "bracketry" is generally setup as a single sheer bottom bolt with a tensioner thing on the top bolt...make sure the mating surface of the bottom hole is flat to support the thing, or create a double sheer bottom bracket to better support the alternator. It has to be mounted solid, or you'll toss belts constantly.

    Make sure you are using the correct width belt, and that both your pulleys are for the same width belt. There are I beleive 1/2" wide and 5/8" wide belts...make sure the belt sits the same on both pulleys.

    Get a smaller crank pulley once everything is aligned and mounted right....will spin the alternator a lot slower and belts will live.

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    Senior Member YumaJet's Avatar
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    what size belt are you running? i used to use a 50+" belt and would always loose it at the river. i finally aligned the alt and used a 43" belt and everything was fine.
    boatless....

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    x2 that once you roll the belt its had it, also agree double check the alignment and my .02 run the deep groove pulleys almost impossible to throw the belt.

  9. #7
    Member seb454's Avatar
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    .Make sure you are using the correct width belt, and that both your pulleys are for the same width belt. There are I beleive 1/2" wide and 5/8" wide belts...make sure the belt sits the same on both pulleys.

    i had the same thing happening to me .this was my problem.

  10. #8
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by YumaJet View Post
    what size belt are you running? i used to use a 50+" belt and would always loose it at the river. i finally aligned the alt and used a 43" belt and everything was fine.
    Not sure what size it is....but I'm not going to be able to go much smaller...or the alt. will hit the cyl. head. Not sure if a wider or skinner belt would help. I will check the alignment tonite and maybe post a pic....it looks perfect to me. I like the deep grove pully idea...and the smaller bottom pully idea. Last year when I tossed on I was wot for a while.lol I will definatly be taking a spare or 2 to the lake from now on.
    Another Hot Boat refugee

  11. #9
    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Not sure what size it is....but I'm not going to be able to go much smaller...or the alt. will hit the cyl. head. Not sure if a wider or skinner belt would help. I will check the alignment tonite and maybe post a pic....it looks perfect to me. I like the deep grove pully idea...and the smaller bottom pully idea. Last year when I tossed on I was wot for a while.lol I will definatly be taking a spare or 2 to the lake from now on.
    Belt should run 'in' the pulleys..ie 1/8 or more below the edge...
    Might want to install a fresh belt and rotate the motor over a few times to see if the belt rides at the same depth all the time..if it's a high RPM deal
    an over sized alt. pulley should solve the problem and free up some HP...

    And years ago GM actually set up the alt. alignment slightly off on 327's.
    The alt was tipped in a few degrees
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    Senior Member CK7684's Avatar
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    Hmmm...I've had the same alt belt on mine since I bought the boat!! The whole engine is new except the alt and belt, lol...could your mounting be flexing at all?

  13. #11
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by CK7684 View Post
    Hmmm...I've had the same alt belt on mine since I bought the boat!! The whole engine is new except the alt and belt, lol...could your mounting be flexing at all?
    The bottom..or pivot point of the alt. is on the front motor plate. I don't think it can move much.
    Another Hot Boat refugee

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    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by H20MOFO View Post
    The bottom..or pivot point of the alt. is on the front motor plate. I don't think it can move much.
    The bolt can flex. Also, if the little mating surface where the alternator touches the plate is beat up/rounded off from shot blasting during rebuilding, it will act like a ball seat and won't provide any support...allowing the bolt to flex even more. It's a long bolt and it's in single shear, so it takes some work to get these things solid sometimes. I had to throw my alternator case on the mill and make that flat again, then using the largest OD ground washers I could fit..shimmed it out to where it needed to be.

  15. #13
    www.highflowdynamics.com LakesOnly's Avatar
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    Your alternator is "leaning over" when the belt is loaded. You need a stronger bracket or more likely an additional bracket that will hold the alternator in position so it doesn't budge from its location.

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  16. #14
    Senior Member Futs's Avatar
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    Try a V belt rather than a cogg belt like you have.

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