Click for Perko Click for YF Listing Service Click for Walker Click for Mulder Click for Westport

Clunk noise from running gear

Discussion in 'Props, Shafts & Seals' started by C4ENG, Feb 16, 2011.

You need to be registered and signed in to view this content.
  1. C4ENG, Feb 16, 2011
    #1
    C4ENG

    C4ENG Senior Member

    Joined:
    May 19, 2006
    Messages:
    581
    Location:
    Ft Lauderdale
    Has any one ever experienced a clunk noise after taking a vessel out of gear while maneuvering?
    If so, did you figure out why?
    Or if you know why you would hear a clunk noise after going out of gear on a 150+ size vessel, I would really appreciate if you would share your knowledge.
  2. Capt J, Feb 16, 2011
    #2
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,435
    Location:
    Fort Lauderdale
    I've seen it where there was a line wrapped around the propellor shaft. The line would stay tight when the shaft was turning, then when turning the oposite way the end wacked the bottom of the hull.

    I've also seen it when a motor mount was bad.Are you getting any engine movement? I've also seen it where Twin Disc used too long of bolts on the flywheel and they were hitting, before a recall was sent out.
  3. C4ENG, Feb 16, 2011
    #3
    C4ENG

    C4ENG Senior Member

    Joined:
    May 19, 2006
    Messages:
    581
    Location:
    Ft Lauderdale
    Or loose. Great place to start inspecting.
  4. Capt J, Feb 16, 2011
    #4
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,435
    Location:
    Fort Lauderdale

    Possibly, check the shaft coupler bolts as well.
  5. Beau, Feb 17, 2011
    #5
    Beau

    Beau Senior Member

    Joined:
    Jan 15, 2010
    Messages:
    2,261
    Location:
    Beaufort, NC
    Indeed, you need to check the whole drive train on each engine. A loose prop knot can let that prop slip, a loose shaft zinc can bounce, the shaft nuts coud be loose, etc.... start with the simple (underwater and work your way back to the engine. Just my suggestion.
  6. corinthian99, Feb 19, 2011
    #6
    corinthian99

    corinthian99 New Member

    Joined:
    Jan 12, 2006
    Messages:
    71
    Location:
    London, UK
    It'd help with a few more details;
    - Is this a new development?
    - Is this present on both engines?
    - Is the captain new and banging it over fwd to reverse with gay abandon (usual cause)?

    Good luck.