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Yep, another query..on a Yanmar 2GMF..engine clatter

Discussion in 'Mid-Size Boats' started by SeanP, Jul 10, 2017. Add this thread to a FAQ

  1. SeanP

    SeanP

    Joined Jun 6, 2017
    57 posts, 4 likes
    Hunter 31
    US Portland, OR Portland
    The vibration begins at 1100 rpm and gets worse all the way up to 2600-2700 RPM. I have a fixed prop. The weird thing is that all is perfect on the way out for a sail and then coming back in once I fire her back up it's vibration city!
     


  2. nveater

    nveater

    Joined Feb 27, 2004
    74 posts, 6 likes
    Hunter 335
    US North East, MD
    I am thinking shaft alignment- I assume you don't get this vibration at the dock when powering up in neutral ?
     


  3. SeanP

    SeanP

    Joined Jun 6, 2017
    57 posts, 4 likes
    Hunter 31
    US Portland, OR Portland
    In neutral at all RPMs there is zero vibration. If it is shaft alignment why do you think that when I fire her up and motor out of the bay to raise the sails...She runs smooth (in gear). After a day of sailing, she vibrates like crazy when I start her back up. In summary there is an intermittent vibration that is baffling! Cheers. Sean
     


  4. nveater

    nveater

    Joined Feb 27, 2004
    74 posts, 6 likes
    Hunter 335
    US North East, MD
    :banghead: It's a boat
     


  5. sailermaned

    sailermaned

    Joined Nov 26, 2014
    13 posts, 0 likes
    HUNTER h31
    US Northport L.I.
    Could it be clutch or transmission not engaged completely, My boat did something similar when the cable was not adjusted correctly , and it did not go completely in to forward gear. After cable adjusted properly all went away.
     


  6. Charles Erwin

    Charles Erwin

    Joined Jan 30, 2012
    865 posts, 68 likes
    Nor'Sea 27 - "Kiwanda"
    US Portland/Anacortes
    The symptoms vanish motoring out and return after sailing? So something about sailing effects your propulsion.

    When you put up the sails for the day what position (forward, neutral, reverse) do you place your gear lever? You have a fixed pitch prop so your prop rotates when sailing - albeit the in the reverse rotation of the gear lever position.

    This problem is significant enough that Yanmar for example says keep the transmission in neutral (actually they say damage will occur if you don't go with neutral when sailing/engine off. ) Other transmissions can show similar symptoms. In any case - consider neutral when sailing thus to eliminate jamming the internal components of the transmission together due to sailing induced reverse prop shaft rotation that really cannot be avoided with a fixed pitch propeller.

    I could be wrong here but maybe try neutral and see what happens?

    Charles
     


    Last edited: Jul 27, 2017
  7. SeanP

    SeanP

    Joined Jun 6, 2017
    57 posts, 4 likes
    Hunter 31
    US Portland, OR Portland
    Good morning,

    Thanks for the comments Charles and Sailermaned. It appears that the starboard rear engine mount is shot. When I sail the motor shifts on the three remaining mounts and causes the racket when I start her back up.

    Btw, I do sail with the transmission in neutral. Trying to track down an engine mount replacement. More on this story as I progress.

    Cheers,

    Sean
     


  8. Unwrittentimeline

    Unwrittentimeline

    Joined Jul 11, 2016
    18 posts, 5 likes
    Hunter 326
    US Oriental, NC Oriental, NC
    I've been working quite a bit. It sounds like you have it worked out now though. Congratulations and hope the mount fixes the issue.
     


  9. MitchM

    MitchM

    Joined Jan 20, 2005
    479 posts, 37 likes
    Nauticat 321 pilothouse 32
    US Erie PA
    re: The vibration issue: have you checked your engine mounts and the amount of face out at 12 - 3 6 and 9 o'clock on the the p - shaft coupler ?
     


  10. SeanP

    SeanP

    Joined Jun 6, 2017
    57 posts, 4 likes
    Hunter 31
    US Portland, OR Portland
    Hi, the rear starboard engine mount is shot, and so I have ordered replacements for both rear units. Not sure what 'amount of face out.." refers to nor the p-shaft you reference? Thanks! Sean
     



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