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  1. #1
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    Water in 2.5l mercury 200 cylinder

    Hey yall, I first noticed a white milky mixture on my spark plugs. I figured it was the head gaskets as the compression test was low and my boat struggled to get out of the hole. I replaced the head gaskets on both sides, the right bank was clean and the pistons all looked good. The left side had water droplets all in it. Figuring it was the head gaskets, replaced them and the compression was good. Ran the boat for a couple months and now it is really bogging down, when I unplug the top left and bottom left spark plugs nothing changes in the idling of the engine, they are still sparking good. But the plugs where very milky. Worse than before. What could be causing this? The engine is a 1998 2.5l v6 and has been used a lot. Its carbed. Compression was 115-120 on all 6 cylinders.

    Tha k you

  2. #2
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    aalsmeer
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    possible powerhead to mid plate gasket failure!

  3. #3
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    ...
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  4. #4
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    Ashland city tn
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    Quote Originally Posted by PanRonnie View Post
    possible powerhead to mid plate gasket failure!
    Yep I'm gonna say ph gasket also , and will wreak havoc on a mota

  5. #5
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    Agree, save for why cyl #2 has water in it ....

    Can exhaust pulses carry water to the top cylinder from the base gasket?
    James H. W2F a V-King... Want 2 Fly a V-King

    Dedicated Site for Hydrostreams >> http://hydrostreamforums.com/
    My Project 1979 V-King restore >> http://hydrostreamforums.com/viewtopic.php?f=9&t=2761

  6. #6
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    A leaking exhaust cover gasket can cause this as well. That one is not to hard to replace either.

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