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  1. #1
    Cadet
    Join Date
    Feb 2004
    Location
    michigan
    Posts
    2

    Default OMC 115 HP JET DRIVE

    I HAVE A 1994 OMC 115HP JETDRIVE THAT WHEN YOU START THE ENGINE THE CYLINDERS FILL WITH WATER.ONE REPAIR PERSON COULD NOT FIND THE PROBLEM.ANY SUGGESTIONS? I ORIGINALLY THOUGHT A CRACKED HEAD.REPAIRMAN REPLACED HEAD GASKET, NO HELP.THANKS

  2. #2
    Chief Petty Officer
    Join Date
    Aug 2003
    Location
    New Jersey
    Posts
    574

    Default Re: OMC 115 HP JET DRIVE

    Hello, Has anyone checked the manifolds? The exhaust manifolds tend to rot out in a few years. Faster if used all the time in salt water. You say that the gasket was changed. Was the head magnafluxed? (checked for cracks) Do all the cylinders fill with water or just one? Or two grouped together? Sorry to ask so many questions, but need a little bit more info to point you in the right direction.
    The only thing that works on an old boat is its owner!

  3. #3
    Cadet
    Join Date
    Feb 2004
    Location
    michigan
    Posts
    2

    Default Re: OMC 115 HP JET DRIVE

    ALL CYLINDERS FILL WITH WATER.NO IT WASN'T MAGNAFLUXED.

  4. #4
    Rear Admiral
    Join Date
    Jan 2002
    Posts
    4,681

    Default Re: OMC 115 HP JET DRIVE

    Your 115 jetdrive is an aluminum outboard powerhead mounted on a jet unit. Besides a cracked block or head(s), water can get into the motor from a leaking base gasket or from leaky exhaust cover gaskets or plate. Ususally an overheat condition will damage the gaskets and water intrusion will result.You may have to remove the powerhead and inspect all the problem areas.

  5. #5
    Lieutenant Junior Grade
    Join Date
    Jan 2003
    Location
    Southwest Florida
    Posts
    1,094

    Default Re: OMC 115 HP JET DRIVE

    Notorious overheaters ! Seahorse is right

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