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Pounding on port hull wall on 63 viking motor yacht

Discussion in 'Engines' started by jmoore, Oct 21, 2026 at 11:50 AM.

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  1. jmoore, Oct 21, 2026 at 11:50 AM
    #1
    jmoore

    jmoore New Member

    Joined:
    Sep 12, 2026
    Messages:
    1
    Location:
    Omaha
    Boat has 12V71TAB's. Around 1600 to 1800 rpm there is a heavy pounding sound by the port engine exhaust that shakes the shows up in master state room with the drawers moving about 1/8 - 1/4" horizontally. With foot on the strut mtg plate do not feel anything. Trying to figure out if its coming from the exhaust system on the exterior of the boat or where it could be coming from.

    Thanks
  2. boatpoor, Oct 21, 2026 at 5:40 PM
    #2
    boatpoor

    boatpoor Senior Member

    Joined:
    May 4, 2016
    Messages:
    303
    Location:
    32407
    What kind of frequency and is it steady at a constant RPM ?