Omc Crank Seals

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  • June 15, 2015 at 12:28 am #1756
    chris-p
    Participant

      I M restoring a 58 18hp Johnson today.

      Needs a crank seal. Calls for the 305987 (18-2018)

      I have a bag of the 303804 (or 321467 or 18-2060)

      is the only difference single lip versus duoble lip? I believe I can use the 321467 seals on the 1958 18hp but just checking.

      I dont have any305987 seals in stock to compare

      thanks

      June 15, 2015 at 3:31 pm #18138
      jeff-register
      Participant

        US Member - 2 Years

        I have the same motor. I went down to the OMC dealer & bought the top seal. Mine works fine now. The bottom seal is the carbon & o-ring correct, can’t remember on that one.

        June 15, 2015 at 9:13 pm #18153
        chris-p
        Participant

          Yes on the ’58 the bottom of the crank has the carbon seal/o ring assembly.

          The seals in question, the 303804 were called for on the earlier 15hp motors. Then they changed to the 305987. Same width, ID and OD. I assume the only difference was the quality, double lip added for the newer seals? Just curious.

          June 15, 2015 at 10:38 pm #18164
          frankr
          Participant

            US Member

            You are correct, it will be fine. But I think the double lip one has been superseded by another single lip one. So enjoy them while you can.

            June 15, 2015 at 11:47 pm #18167
            chris-p
            Participant

              Ok great thanks Frank.

              I used to have a lot more of them, but have listened to your advice about changing those 303804 seals over the years.

              As you preach, they seem to almost always be shot and letting water in the powerhead.

              June 16, 2015 at 1:03 am #18172
              mr-asa
              Participant

                So the double lip is 305987?
                The Sierra 18-2018, anyone know if that one has gone to a single lip, or is it still double?

                Frank mentioning that they started to change those out makes me want to check before I buy anything

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