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‘84 90hp i6 water jacket

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  • ‘84 90hp i6 water jacket

    Hi all I have water in cylinder 3 when I look at the plug... done various tests and it seems the water jacket needs changing from reading... can anyone show me what this part looks like? Some people say just the gasket others say the jacket itself will be warped so that will be needed with the gasket... then I look at water jackets online and some just look like the cover where the plugs go ... and others look like they have rectangular ports... anyone able to tell me what’s correct? Thanks

  • #2
    Answer in detail-----Do you actually have water inside the cylinder ?-----Or is water leaking around #3 sparkplug when motor is running ?------If water is actually getting into the cylinder it can cause major rust damage to bearings in the crankcase and needs to be fixed ASAP.-----That would involve removing the side exhaust cover.----Salt water motor ?

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    • #3
      Like above, make sure you get the correct diagnosis, if your not sure take it to the dealer/mechanic.
      Better get a factory service manual.
      Water in #3 is kind of a big deal, if you've never done it before.
      You could watch all the you tube videos.
      .

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      • #4
        Originally posted by tommarvin View Post
        Like above, make sure you get the correct diagnosis, if your not sure take it to the dealer/mechanic.
        Better get a factory service manual.
        Water in #3 is kind of a big deal, if you've never done it before.
        You could watch all the you tube videos.
        .
        What videos should he watch? Youtube has billions to view!
        BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

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        • #5
          Originally posted by GA_Boater View Post

          What videos should he watch? Youtube has billions to view!
          It seems "watch youtube videos" is his answer. Maybe a stockholder?

          A parts diagram is available at Mercruiserparts dot com

          A repair manual will be your friend with that motor.
          Will have parts diagrams as well.

          Factory is nice, but it assumes you have background.

          Clymer brand repair manual is easy to follow, and a lot cheaper.
          Google "clymer B726" for lots of new and used choices for the manual.

          Last edited by roscoe; December 9th, 2017, 10:07 PM.
          Medford, WI


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          • #6
            Sign up today
            I had the same issue with a Mercury 150hp, but I didn't have water in the cylinder, it was coming from under the block... all I had the do is change the water gasket gasket..but to get to the water jacket gasket, I had to replace 2 or 3 other gaskets in the process. But its not to hard...

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