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Importance of exhaust flaps 4.3?

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  • Importance of exhaust flaps 4.3?

    So I just got done fixing the shifter linkage in the gimbal and Drive unit. While I had it apart I found a piece of the exhaust flap from one of the exhaust headers down by the shifter rod in the exhaust exit.

    How important are these for operation? I’d really like to take the boat down to the water tomorrow and put around a bit to make sure everything works before I decide to spend any more time or money on it.

    would I be safe doing a little trial run without one of the flaps installed?

  • #2
    The exhaust shutters are very important in trying to mitigate the ingress of water into the exhaust manifolds, and then into the cylinders.

    To run without the shutters, I would consider a few things. Rough water? how far between the top of the y-pipe and the outside water level? Are you considering doing any 'fast stops'? Also consider, if this is a test run with an engine of unknown condition, a fast stop may occur without you really planing it.

    If the shutters weren't really needed, Merc wouldn't have put them in. They aren't that expensive, and could save your engine from an internal water bath. Put them in.

    Chris.......
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    The world takes on a whole new perspective when viewed from 100’ below.
    1972 Bertram ‘Bahia Mar’ 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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    • #3
      I should have heeded your advice I nearly suck my boat today... Kidding I order the flaps and will wait to trial run.

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      • #4
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        Originally posted by lr3guyjoe View Post
        I should have heeded your advice I nearly suck my boat today.


        Originally posted by lr3guyjoe View Post
        .. Kidding I order the flaps and will wait to trial run.



        But did you order the slats and ailerons to go with the flaps?
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        The world takes on a whole new perspective when viewed from 100’ below.
        1972 Bertram ‘Bahia Mar’ 20
        2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
        (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


        Comment

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