Bravo 3 magnesium anode in fresh water

Discussion in 'General Maintenance/Repair Questions' started by Big blue, Jan 4, 2018.

  1. Big blue

    Big blue Member

    32
    Nov 19, 2017
    Cardiff u.k.
    310da sundancer 1998 mercruiser D4.2
    Mercruiser D4.2
    I think this is something that’s going to be a trial and error, mags lasted 6 months really, cannot afford to have any more corrosion on drives as I fear it will start leaking oil, just hope the nav alloy saves the day
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    "trial and error" - yes, often times that's exactly what it is. Just monitor closely and if things aren't going well, switch back to Mg. I would also suggest checking into some of the things mentioned above... stray current or a neighbor.

    "Fear of leaking oil" - post some pics of your drive without the props on?
     
  3. Big blue

    Big blue Member

    32
    Nov 19, 2017
    Cardiff u.k.
    310da sundancer 1998 mercruiser D4.2
    Mercruiser D4.2
    ABC71F2E-BAAD-491C-992F-6226FFAFB768.jpeg Hi
    Here is a photo of the drive with bearing carrier exposed, it’s heavily corroded by the seal, just lucky the seal is deep or it would be totally exposed in parts , also heavy pitting on the lower casing too. I have painted the carrier in the past to protect it
     
  4. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    What paint is on that drive, looks like bottom paint?
     
  5. Big blue

    Big blue Member

    32
    Nov 19, 2017
    Cardiff u.k.
    310da sundancer 1998 mercruiser D4.2
    Mercruiser D4.2
    The paint on the outdrive is international prop o drev drive paint
     
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Hmmm. That seems to be a strange corrosion pattern. It looks more like damage than corrosion. That's "kinda" a good thing since it shouldn't really get any worse. Just keep up with your painting and monitoring.
     

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