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Thread: 502 fired up! Humming noise from KC drive?

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    502 fired up! Humming noise from KC drive?

    Hey guys We got the 502 fired up today (finally)!

    The engine sounds good and quieter than expected through the Corsa exhaust but I heard a humming noise that seems like it is coming from the drive. It is a King Cobra drive. Is this normal and if not anyone hear have a guess what I am hearing? It is not intake noise, it definitely sound like it is coming from the drive or back of the engine. I have a video to upload but the site is not letting me do it for some reason. Thanks for your help!
    Jay Z.
    '93 White/Teal Classic 22

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    Dunk it and run it like you stole it. You will never hear it.
    Thanx,
    SCOTT R.

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    Quote Originally Posted by Jraysray View Post
    Dunk it and run it like you stole it. You will never hear it.
    Scott, I hope you are right. ...it's probably obvious by now that I way over think things. That's probably why I missed a whole season of use with the 22...
    Jay Z.
    '93 White/Teal Classic 22

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    Alignment good?
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

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    Quote Originally Posted by Tidbart View Post
    Alignment good?
    Sure seemed good when checked.
    Jay Z.
    '93 White/Teal Classic 22

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    Those omc drives have secret hand shake adjustment on the shift cable
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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    Quote Originally Posted by joseph m. hahnl View Post
    Those omc drives have secret hand shake adjustment on the shift cable
    ...makes the whining noise or humming while in neutral. I am not sure if it whines while in gear I did shift it while on the muffs and it went into fwd and reverse but that was before I noticed the whining noise.
    Jay Z.
    '93 White/Teal Classic 22

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    Water pump impeller, did you replace wear plate as well?
    Rated 'R'
    Raw Rowdy & Rockin

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    Does it feel like neutral is truly neutral? Is there equal distance to forward from neutral as there is to reverse?

    What carb are you running? Is that 415hp?

    Can you put up pitchers? I am mounting a 502 soon too.
    Top Gun 1992 22 Classic 540hp rebuilt HP500 King Cobra

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    Curious just how loud, describe the sound. I have Bravo diesel X on my 22, when I have the mufflers on I can hear a whirring sound it been hearing it for years, spooked me at first but I have heard several others they sound the same. The other possible culprit is the gimble bearing, did you check to see how smooth it was when turned by hand?
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

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    Quote Originally Posted by Greg K View Post
    Water pump impeller, did you replace wear plate as well?

    Replaced it all including the wear plate.
    Jay Z.
    '93 White/Teal Classic 22

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    Quote Originally Posted by miike View Post
    Does it feel like neutral is truly neutral? Is there equal distance to forward from neutral as there is to reverse?
    I have no idea but the prop was not spinning.

    What carb are you running? Is that 415hp?
    Holley 750

    Can you put up pitchers? I am mounting a 502 soon too.
    sure! Shiner Bock work for you?
    Jay Z.
    '93 White/Teal Classic 22

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    Quote Originally Posted by JayZ View Post
    Replaced it all including the wear plate.
    Use to hear the same thing with mine and always felt it was the pump. Never was an issue.
    Rated 'R'
    Raw Rowdy & Rockin

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    Quote Originally Posted by MOP View Post
    Curious just how loud, describe the sound. I have Bravo diesel X on my 22, when I have the mufflers on I can hear a whirring sound it been hearing it for years, spooked me at first but I have heard several others they sound the same. The other possible culprit is the gimble bearing, did you check to see how smooth it was when turned by hand?

    The boat has Corasa mufflers and is fairly quiet and one can hear the whining fairly easy but I think you have to be listening for it. I don't know if I simply didn't hear it the first few minutes of running or if it presented itself after some time and heat built up.

    I have a video with sound that I tried to post. I can email it to you if you like.
    Jay Z.
    '93 White/Teal Classic 22

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    Quote Originally Posted by Greg K View Post
    Use to hear the same thing with mine and always felt it was the pump. Never was an issue.
    Thanks, that is reassuring! neutral only or while in gear too?
    Jay Z.
    '93 White/Teal Classic 22

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