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  1. #1
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    Merc 150 4s 3 lt - have 2 - they sound different

    I have 2 of the Merc 150 4S 3.0lt and they sound different, both purchased new. 2017 on a Mako 235 CC- 180 hours so that is my base line
    2018 is on 22' Tahiti deck boat. - 22 hours on it. The 2018 makes a different sound at running speeds - the pitch or sound rhythmically varies up and down while RPMs are steady.
    Waa-Waa-Waa-Waa
    2017 on Mako is a 25", deck boat with different sound is a 20". Mako gets fairly little trim use, Deck boat gets a lot of trim and motor mounted relatively higher on transom - and higher trimmed up seems to make sound pulse more noticeable.
    Any thoughts- concerns- ? Under Warranty of course.
    Last edited by CircleHook; 11-20-2018 at 07:16 AM.

  2. #2
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    Mine made the same sound on my bay boat. I don't think it's anything to worry about.

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