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  1. #1

    Default 1988 Johnson 90hp Water in cylinder

    I purchased a 1988 Johnson 90hp VRO this spring. Installed it on my 1960 17'6" EM white. The first time I used it I found it was lacking power. Not a lot but 70hp could walk away from me. Changed plugs when installed. After a few trips I decided to see what the spark plugs looked like. Pulled all the plugs and noticed #4 cylinder looked milky but still had coloring like it was firing. So I pulled head and replaced gaskets. Still getting water droplets in cylinder. Cylinder compression test was 125 in all cylinders befor and after. Any suggestions?
    Last edited by Chevrat68; 09-26-2017 at 11:12 AM.

  2. #2
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    2,582

    Default Re: 1988 Johnson 90hp Water in cylinder

    Lower crank seals
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  3. #3

    Default Re: 1988 Johnson 90hp Water in cylinder

    Just replaced exhaust cover gaskets. Still have water droplets. How dose water work it's way up to the crank seals? I'm running it with muffs and a storage bucket filled with water to keep the noise down.

  4. #4

    Default Re: 1988 Johnson 90hp Water in cylinder

    I will pull the power head and replaced the seal. Any other problem areas I should take inspect? It was run in salt water a lot. I cleaned up all the ports in the heads.

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