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20 hp Evinrude 2 stroke drain plug

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  • 20 hp Evinrude 2 stroke drain plug

    Hi, I have a 20 hp 2 stroke evinrude. I recently changed the lower unit oil. After my first trip of the year, I decided to change the oil again and found a bit of water as it drained. I noticed that the top drain plug had a oil slick coming down the unit. The plug was tight but not flush with the housing. I checked for cross threading, old gasket and all clear. I attempted to screw the plug back in and it goes tight but not flush. I thought maybe I mixed up the plugs and moved the bottom one to the top with the same results.


    Any suggestions?

  • #2
    Re: 20 hp Evinrude 2 stroke drain plug

    Original threads?..... I'm wondering if someone stripped the threads at one time and installed a Heli Coil at a slight angle.

    Suggestion... Install two fiber type gaskets on the screw. The combined thicker gasket hopefully will fill the off level gap.
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    • #3
      Thanks for the suggestion I'm going to try that next.They are the original plugs. I took it from my grandfather a few years ago. It seems to be going in on an angle.

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      • #4
        yeah, put more gasket material on and see what you get. Could do that and call it a day.
        1970 16ft no name trihull skiff, 40hp evinrude tiller
        1997 Caravelle 1750 BR, 3.0 Mercrusier
        1994 GMC sierra 4x4


        Happy boat building, Johnny

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        • #5
          I filled my lowercase unit with oil on 1982 evinrude 25hp. There is a small hole to the left of the top vent screw and oil began to seep out that hole. What's happening?

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          • #6
            Have your lower unit pressure and vacuum checked.

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            • #7
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              Originally posted by Pullstarter View Post
              I filled my lowercase unit with oil on 1982 evinrude 25hp. There is a small hole to the left of the top vent screw and oil began to seep out that hole. What's happening?
              This post is 4 years 5 months old... Start a new thread.
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