freeze plug help

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  • Nbigger
    • Mar 2008
    • 79

    • Fenton, MI

    #1

    freeze plug help

    I winterized my boat for the first time and I found that the plugs were all striped pretty bad. Now it is time to put the plugs back in and I can run a tap through the block plugs pretty easy but the plugs from the manifold are in pretty bad shape and may need to be taped a bigger size. Has anyone done this or have any tips. I did not have any leaks in the system last year but I figured that this is the time to fix it.

    Thanks, Nick
    Tags: None
  • DavidF
    Senior Member of PLANETNAUTIQUE
    • Sep 2004
    • 611

    • Austin, TX

    #2
    RE: freeze plug help

    You mean the "drain" plugs. Your thread title threw me off for a minute. Finding a larger plug for the exhaust manifolds might not be so easier or the next size is going to be a large difference. If it were me, I would purchase the petcock drain valves/fitting from Skidim and before installing, go ahead and tap the drain hole (to get it clean) and then glue the adapter bushing (that comes with the petcock kits) into the manifold with epoxy. With the petcocks, yoiu never would have to remove the reducing bushing again and can easily change out the petcock if necessary. Just a thought.

    http://www.skidim.com/prodinfo.asp?number=MCM001

    Comment

    • Nbigger
      • Mar 2008
      • 79

      • Fenton, MI

      #3
      RE: freeze plug help

      Thanks for the link that would be perfect.

      Nick

      Comment

      • Nbigger
        • Mar 2008
        • 79

        • Fenton, MI

        #4
        RE: freeze plug help

        Does any one know the drain plug tap sizes? for the block and the manifold.

        Comment

        • DavidF
          Senior Member of PLANETNAUTIQUE
          • Sep 2004
          • 611

          • Austin, TX

          #5
          RE: freeze plug help

          I think it is 3/4" NPT, but not sure.

          Comment

          • Nbigger
            • Mar 2008
            • 79

            • Fenton, MI

            #6
            RE: freeze plug help

            ok thanks again.

            Comment

            • AirTool
              1,000 Post Club Member
              • Sep 2007
              • 4049

              • Katy, Texas

              #7
              RE: freeze plug help

              Be careful chasing the threads on an NPT connection. NPT threads are tapered and you can oversise the hole if you don't pay attention to the depth.

              AirTool

              Comment

              • jaybird
                Senior Member of PLANETNAUTIQUE
                • Oct 2008
                • 516

                • North Alabama Lake Weiss

                #8
                RE: freeze plug help

                Block is 1/4" NPT, Manifolds are 3/4" NPT
                This is a very common problem, the mistake some make is removing the drain plugs and leaving them out all winter. This will cause rust in the threads and over time erodes away causing the threads to become over sized. After draining a block it wise to replace all the plugs and pour a 50/50 mix of antifreeze in. This keeps gaskest from dryng out and with the plugs in places no rust will form in the threads.
                2012 Team Ski Nautique ZR409
                2011 Sport Nautique 200
                2008 SANT 230
                2003 Air Nautique 226
                1988 Martinique
                1979 Nautique
                1978 Tique
                1976 Tique (First New Boat)

                Comment

                • DavidF
                  Senior Member of PLANETNAUTIQUE
                  • Sep 2004
                  • 611

                  • Austin, TX

                  #9
                  RE: freeze plug help

                  So true, and for good measure it is wise to coat the threads of the plugs with anti-sieze.

                  Fortunately, Nick's main problem is with the exhaust manifolds that are relatively easy to replace if a total lose.

                  Comment

                  • Nbigger
                    • Mar 2008
                    • 79

                    • Fenton, MI

                    #10
                    RE: freeze plug help

                    Thanks for the help and the tips on how to do this right down the road.

                    Nick

                    Comment

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