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  1. #1
    Member
    Join Date
    Mar 2021
    Location
    North Carolina
    Posts
    1

    2001 225 efi knocking under load

    The boat idles well with no noise and will idle in gear with no noise. When I take off i get a loud knocking noise. Compression is good on all cylinders. I think it could be a bad clutch dog but im not 100%.

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    97,977
    #2
    If you would, please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks!

    Good starting point is to check gear lube for contamination or metal, verify proper shift-cable adjustment.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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