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  1. #1
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    Bravo leaking oil from water intake

    I tried posting this question on another boating forum with no results. its not a whacker, but I bet that I will get more info here.
    1989 Sea Ray with 7.4 bbc and Bravo one drive.


    I just installed a new SEI bravo lower unit. I have gear oil leaking out of the water intakes on the side of the gear case.

    Last year when I pulled the boat out of the marina, I noticed 1/4" size bubbles rising up into the drive oil reservoir. I knew I had an issue.
    This boat did sit in salt water for the last year, and took some pretty bad corrosion to the drive.

    When I got the boat home, I tried to pull the drive Drain plug. It was stuck. All attempts to remove failed. I tried everything. I figured that the drive got water inside and corroded from the inside.

    I purchased a new lower unit from SEI and installed last week. after filling with gear oil it started leaking out of the water intake holes on the side of the gear case.

    I had tapped and inserted a plug into the extra oil passage in the lower unit thats needed when installing the new style lower on an older drive. Even if this was leaking, it would be much less than whats leaking out.

    What seal could be leaking that is causing this ? Must be the in upper ?

    Thank for any info.
    Last edited by inspectorlance; 06-09-2016 at 12:06 AM.
    2005 TRIAD STV EURO
    421 HP OMC 3.3 EFI by STOKER
    16" Taylor mid, Merc sporty



  2. #2
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    Ttt
    2005 TRIAD STV EURO
    421 HP OMC 3.3 EFI by STOKER
    16" Taylor mid, Merc sporty



  3. #3
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    O-ring around the drive shaft bearing where the two halves go together most likely did not seal. Since you mention corrosion make sure the top half does not have any pin holes.
    Lance I hope all is well with you.

  4. #4
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    Quote Originally Posted by inspectorlance View Post
    Ttt
    What was the final cause and repair?
    Checkmate 2002 Convincor 270 496 MAG-HO

    2003 Cougar 22MTR w/300xs SOLD
    90 21Skater w/300xs - sold
    98 STV Euroski w/280 - sold


    2006 Trailblazer SS 6.0l 395hp

  5. #5
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    It was just the oring that Racer mentioned.
    2005 TRIAD STV EURO
    421 HP OMC 3.3 EFI by STOKER
    16" Taylor mid, Merc sporty



  6. #6
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    Quote Originally Posted by racer View Post
    O-ring around the drive shaft bearing where the two halves go together most likely did not seal. Since you mention corrosion make sure the top half does not have any pin holes.
    Lance I hope all is well with you.
    With the attached photo I presume it's #3, 13, and do 14 while apart?
    Attached Thumbnails Attached Thumbnails Bravo-1asm_edited-1.jpg  
    Checkmate 2002 Convincor 270 496 MAG-HO

    2003 Cougar 22MTR w/300xs SOLD
    90 21Skater w/300xs - sold
    98 STV Euroski w/280 - sold


    2006 Trailblazer SS 6.0l 395hp

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