951 water jacket leak - Cant find it

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  1. #1
    PWCToday Newbie
    Join Date
    Jan 2016

    951 water jacket leak - Cant find it

    I am in the process of rebuilding a new to me 951 DI. I can pass the leak test on the engine with flying colors. It started at 5 lbs, and 10 hours later, dropped to 2.5 lbs... The cooling path I can not get to seal.

    I started with 1211 on the head gasket, with no luck, only to find out the cylinders were warped. I took it to a shop and had the cylinders and head trimmed. New thicker base gasket and copper spray, and nothing... I drop 2.5 lbs in 3 minutes.

    I can not find the leak. I have sprayed everything I can think of, and nothing...

    If I had a cracked cylinder, wouldn't I have a leak out on the engine leak test?

    I want to get this ski on the water this year, but it is not looking good...

  2. #2
    Frequent Poster
    Join Date
    Feb 2006

    Re: 951 water jacket leak - Cant find it

    The leak is in the cooling circuit or inside the cyl. block?
    It also maybe that you have a leaky pressure test equipment.
    I know, this is a very boring task but you have to start with order and exclude a potential cause at time. Check the integrity of the pressure test instrument, look at every connection you made,
    Normally the solution is the simplest...
    Good luck

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