7.5 evinrude

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  • March 6, 2018 at 7:31 pm #9362
    1957evinrude
    Participant

      US Member

      Is it necessary to replace the base gasket on a 1957 7.5 evinrude after removing powerhead if original gasket still looks okay ? I will be replacing the impeller and also I want to make sure all the parts are installed correctly just under the powerhead and replace whatever needs to be replaced.

      March 6, 2018 at 9:49 pm #72068
      jerry-ahrens
      Participant

        US Member

        I’ve reused the base gasket many times. As long as it’s not broken or torn up, you can coat it with some Permatex #2 sealer and go with it.
        I would replace the cork seal on the upper end of the driveshaft, as well as make sure the correct spring and cup washers are present. Very important on that motor.

        March 6, 2018 at 10:32 pm #72070
        fleetwin
        Participant

          US Member

          Not replacing the gasket is a gamble, might leak afterwards even with sealer….But, a leaky gasket won’t cause any harm, just having to pop the powerhead again and replace it….
          Like Jerry says, don’t overlook the lower seal components though….I would definitely replace the cork gasket and carbon seal oring. These parts are not worth the gamble and will cause harm if the seal assembly is not working properly….

          March 6, 2018 at 11:22 pm #72072
          fisherman6
          Participant

            US Member

            I have reused almost as many base gaskets as I have replaced. I agree with Don that it’s a gamble and I have had them leak and had to replace them before. Most times they don’t leak. I always clean the mounting surface it didn’t stick to thoroughly before replacing the gasket. I usually use grease between the gasket and the sealing surface. I have not had any trouble with grease and it makes pulling the powerhead back off no problem.
            Definitely always replace the cork gasket and the carbon seal O-ring when pulling the powerhead off a motor you don’t know the history of.
            -Ben

            OldJohnnyRude on YouTube

            March 6, 2018 at 11:30 pm #72074
            brook-n
            Participant

              Is the base gasket expensive or no longer available?
              You would be right at the point of installation.
              Might be worth replacing it just for piece of mind.
              If it is available and not cost prohibitive.

              Respectfully,

              March 6, 2018 at 11:50 pm #72077
              crosbyman
              Participant

                Canada Member

                try vintage outboard .com

                https://www.vintageoutboard.com/collect … ets?page=2

                Joining AOMCI has priviledges 🙂

                March 6, 2018 at 11:55 pm #72078
                dave-bernard
                Participant

                  US Member

                  If you use a new gasket, lightly grease it and I found you can use them many times. wont break or tear.at least for me.

                  March 7, 2018 at 12:13 am #72081
                  brook-n
                  Participant

                    I share Dave’s opinion, ( lightly grease the gasket)

                    Respectfully,

                    March 7, 2018 at 1:58 am #72085
                    1957evinrude
                    Participant

                      US Member

                      Thanks for all the replies. I decided to replace all !!!

                      March 7, 2018 at 2:10 am #72087
                      cajuncook1
                      Participant

                        Make a video when you are done. I want to see you running the old girl!! 🙂

                        Cheers,

                        Cajuncook1

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