U-Joint Noise
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U-Joint Noise

  1. #1
    Senior Member YumaJet's Avatar
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    Default U-Joint Noise

    I ran my boat yesterday and as I was making my way back to the dock, I heard a knocking noise at about 800rpm, when I would give it gas at 1krpm, it would go away.

    I did noticed my sons little car had made its way under the pan, so I thought it was just vibrating, so I didn't think to much of it.

    I went home and took off the drive line and the noise was gone. I spun the pump and it was smooth with no noise. The only thing I could think of, would be the u-joints. Can the u-joints make a slight knocking sound if not greased enough, even at low rpm?
    boatless....

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  3. #2
    Senior Member Filucky's Avatar
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    Default

    If you have any doubt, for the price of some new u-joints i would just replace them. The needle bearings just wear out after a while, replacing them is cheap insurance.
    Nice!

  4. #3
    Senior Member DuaneHTP's Avatar
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    Sounds like you just had it idling too slow. If the splines on the pump are a little wore or not greased well, they will rattle at that RPM. Giving it gas and the noise going away is exactly how it would act. Grease the splines and U-Joint coupler real good, put it back together and idle it at 1000 rpm or better and I'll bet your noise is gone.
    Duane HTP

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  6. #4
    Member MAFIA'S-PGE's Avatar
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    Default The man in yuma

    go see vic at desert yacht marine! If you are from yuma, you will find him close. He is not only a great guy, he is very knowledeable,and with years of experience you cant go wrong!

  7. #5
    Senior Member YumaJet's Avatar
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    Thanks for the replies. It had a little bit of grease on the splines. I'll grease up the joints and add alittle more to the splines.

    I've known Vic for sometime.
    boatless....

  8. #6
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    Quote Originally Posted by DuaneHTP View Post
    Sounds like you just had it idling too slow. If the splines on the pump are a little wore or not greased well, they will rattle at that RPM. Giving it gas and the noise going away is exactly how it would act. Grease the splines and U-Joint coupler real good, put it back together and idle it at 1000 rpm or better and I'll bet your noise is gone.
    Duane HTP
    x2

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