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Thread: Harmonic damper

  1. #1
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    Harmonic damper

    Hi, I have a sweet 16 fitted with a 4.3 Mercruiser, I had been noticing an odd vibration at slow speeds and the odd clonk and some times a ringing sound when I snap the throttle open, so today I had a poke about in the engine compartment, well.....I found the harmonic damper had come apart, no trace of any rubber,and the two face's that the rubber should be bonded to are very nicely polished, so I imagine it been broken for sometime, I have only owned the boat for a year, and I know it had not been used for about 5 years before I bought it.
    Its not to much of a problem, I just wondered if these things are prone to braking up or is it "just one of those things", I'm in the U.K.

  2. #2
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    Rare! First one posted up here.

    Phil
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  3. #3
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    Tidbart had his go bad on a 502 recently
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


  4. #4
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    And that one was only about 6 or 7 years old.
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  5. #5
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    That's sounds like it's going to be a real getting it off the crankshaft
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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  6. #6
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    I got it off the front of the crank no trouble, the only problem seems to be its about 2'6" down to the front of the crank....but my arms are only about 2' long...!!

  7. #7
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    Make friends with an ape. They have really long arms..Ed

  8. #8
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    Tool rental is free at Autozone.
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  9. #9
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    I've had one spin but never come apart. I guess it would be the next thing that happened if you didn't notice it at first.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1972 John Allmand - Nova19 (#2)
    1982 PolarKraft -Jonboat - Crab Killer

  10. #10
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    Quote Originally Posted by f_inscreenname View Post
    I've had one spin but never come apart. I guess it would be the next thing that happened if you didn't notice it at first.
    Trying to time an engine would drive you nuts.

    Ken

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