1970 Evinrude Sportwin

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  • April 19, 2017 at 2:25 pm #6792
    mike-stroz
    Participant

      I was just given a ’70 Sportwin last night, and it looks like it’s in decent shape, but is there anything I should look out for when I start tearing into it? So far it’s the newest motor I’ve ever had and it’s very different from the 1930’s OMC stuff I normally work on. I know I definitely need a water pump, new fuel lines, and a carb kit.

      April 19, 2017 at 2:48 pm #56368
      fisherman6
      Participant

        US Member

        Check out the points too. They can probably be cleaned and adjusted. At the cost of a new OMC / BRP tune up kit, I’d probably just replace the points, condensers, and oiler wick. The coils ‘should’ be OK but I’ve seen some of them cracked in this vintage. Always a good idea to look for any pinching or chaffing of the plug wires too. Check the gearcase for water, of course. If there is any, a seal kit is a good idea. It’s a 5-bolt gearcase and pretty robust, but always best to keep water out. That usually does the trick on most of them. Others may have further recommendations.
        -Ben

        OldJohnnyRude on YouTube

        April 19, 2017 at 3:01 pm #56371
        frankr
        Participant

          US MEMBER PAY BY CHECK

          That would be the 9.5hp. Good motors, but some notorious problems, like broken upper front motor mount and smoke inhalation. Most stuff is easy to work on, but if it has to be shucked out of the shell it can be an eye-opener. It really isn’t hard, just a lot of parts and doo-dads.

          April 19, 2017 at 3:40 pm #56374
          mike-stroz
          Participant

            Ok, I’ll definitely be checking out the motor mounts and exhaust for any problems. I think I’ll leave the original ignition system if I can get it working. No need to mess with something if it works.Does anyone know what water pump it will take? I see several kits for sale online

            April 19, 2017 at 4:44 pm #56377
            frankr
            Participant

              US MEMBER PAY BY CHECK

              377178>775519 impeller (or sierra 18-3003)
              OR 379765 impeller kit
              OR 382296 water pump kit, complete (or sierra 18-3402 (Sierra does not include housing)

              April 19, 2017 at 5:18 pm #56380
              mike-stroz
              Participant

                Perfect, I guess I’ll figure out what I need when I start tearing into it this weekend. Hopefully just the impeller so I can save some money.

                April 19, 2017 at 5:24 pm #56381
                fisherman6
                Participant

                  US Member

                  Frank is right, of course. I was thinking 18 hp not the 9.5 when I said the gearcase was a 5-bolt. The 9.5 has the small gearcase. They do have some known idiosyncrasies and are not real powerhouses. They seem to run nicely though. I have one I haven’t worked on yet (1972), but really know only what I have heard and what is the same as other OMC motors I have worked on. Please pardon my error. 😳
                  -Ben

                  OldJohnnyRude on YouTube

                  April 19, 2017 at 8:13 pm #56383
                  Mumbles
                  Participant

                    Accesing the water pump on these motors is done in the traditional way by undoing the four bolts holding the gearcase on and then undoing the shift rod connector. Not much else except for the magneto is traditional as the carb is unique and so is everything else.

                    I’m trying to make one out of two right now so I’ll take some photos of the troublesome seals and other things before the one goes back together. It seems lately these 9.5 lo profile motors have been getting popular on the forums here! Now it’s my turn to play with one.

                    April 19, 2017 at 9:53 pm #56389
                    fleetwin
                    Participant

                      US Member

                      Hopefully, this is an engine that was used only in fresh water….Working on these engines can be a challenge, unless you have had some experience with them. Wrestling a salty dog apart is a real challenge. Hopefully, your engine has no exhaust leaks, good motor mounts, and driveshaft splines that are not seized into the crankshaft.

                      April 20, 2017 at 5:15 pm #56425
                      mike-stroz
                      Participant

                        Looks like this one’s going to take me a lot longer than I thought… On the plus side, it looks like a freshwater only motor; no corrosion to speak of. The problem is that the person I got it from started taking it apart so all the linkages for the throttle, ignition advance, choke, etc. Are all in a bag that I have to sort through. I don’t think it’ll take much to get running, but it’s going to take me hours to figure out how to get the linkages back together…

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