Part number? impeller

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  • April 4, 2015 at 12:19 am #1102
    tom-c
    Participant

      I’m helping a friend replace the impeller in his ’56 RDE-18 Johnson 30 HP. Can someone provide a part number for me for the impeller. Also is Sierra ok? any info or suggestion appreciated! Thx.

      April 4, 2015 at 12:29 am #13309
      RICHARD A. WHITE
      Participant

        Lifetime Member

        Sierra 18-3006 about $17 bucks or so, That is from Marine engine.com and believe it or not, the Original is CHEAPER!!!!!!!!!!!

        http://www.richardsoutboardtools.com
        classicomctools@gmail.com

        April 4, 2015 at 12:32 am #13310
        tom-c
        Participant

          Thanks, Richard!

          April 4, 2015 at 12:33 am #13311
          tom-c
          Participant

            One more thing……my book says half pint to a gallon, really? 16:1. It has bearings doesn’t it?

            April 4, 2015 at 12:35 am #13312
            chris-p
            Participant

              Yeah the original part number was 375808. It superseded to 378891 which superseded to 775521

              While you can get the 18-3006 for it from Sierra, I buy the OEM ones. Better, and CHEAPER!

              April 4, 2015 at 12:36 am #13313
              RICHARD A. WHITE
              Participant

                Lifetime Member

                It shows bearings around the rods and crank…but oil is cheap

                http://www.richardsoutboardtools.com
                classicomctools@gmail.com

                April 4, 2015 at 12:39 am #13314
                chris-p
                Participant

                  EDIT: The center main, top and bottom of crank, wrist pin and big end of connecting rod are needle bearings yeah.

                  I run 24:1 in mine, but wont hurt it with the 16:1.

                  April 4, 2015 at 12:53 am #13316
                  tom-c
                  Participant

                    Just wanted to advise a friend. He has a near perfectly restored ’56 Johnson. The new paint job is the best I’ve ever seen. He said he had it done at a body shop in Wisconsin. I’m doing the water pump for him and he does not seem to be knowledgeable about the motor. I’m going through the ignition, carb, lower unit oil and new impeller for him.

                    April 4, 2015 at 1:03 am #13317
                    frankr
                    Participant

                      US Member

                      I believe you will find the 30hp has needle bearings on the wrist pins. They were known to disintegrate, but not because of oil. Anyhow, the mix was 1/2 pint per gallon for convenience in mixing small batches. But the full 6 gallon tank called for a quart of oil (24:1)

                      April 4, 2015 at 1:11 am #13318
                      tom-c
                      Participant

                        Thanks. I don’t know what he has been using but I will tell him to use at least 24:1.

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