1986 evinrude 28 with no spark

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  • July 13, 2022 at 10:54 am #262895
    David Fallang
    Participant

      E28ECD

      I’m working on an electric start 1986 Evinrude 28HP.  There is no spark on either cylinder.  I’ve replaced both ignition coils and the CDI with no improvement so I tackled the task of taking off the flywheel.  It wasn’t easy but I finally got it – see photo.  So I’m guessing that black goo all over the base plate is from a shorted/overheated coil melting.  But I think that’s the “charging coil” to replenish the battery for starting so it doesn’t seem like it should prevent ignition.  The other two coils look ok and have pretty thick wiring.  The little white plastic thingy I think is the “sensor”, sometimes referred to as the “trigger”.  Can it be tested?   Should I just replace it?  Any thoughts?

      July 13, 2022 at 12:27 pm #262904
      frankr
      Participant

        US MEMBER PAY BY CHECK

        Replace the charge coil.  “Charge” refers to charging the capacitor in the power pack…NOT charging the battery.  In fact, the ignition is completely independent from the battery.  Connecting a battery to the ignition system can destroy some $$$ goodies.

        July 13, 2022 at 2:20 pm #262905
        David Fallang
        Participant

          Great, thank you.  The system has a rectifier to charge the starting battery so I thought maybe this coil was dedicated to that purpose.  I couldn’t find much of anything online about this arrangement.

          July 13, 2022 at 5:03 pm #262909
          billw
          Participant

            US Member

            The triple coil lamination in the background of the picture is the one that charges the battery through the rectifier. The black one in the foreground charges the capacitor in the power pack, like Frank said. It does look quite toasted and certainly would cause a no spark situation if has failed electrically, which is pretty much a given, looking like that.

            Long live American manufacturing!

            July 13, 2022 at 5:46 pm #262913
            David Fallang
            Participant

              So I had it completely backwards!  Ha! the story of my life.  Still, it’s cool to take something apart and be able to visibly see something wrong.  Thanks for the info.

              July 14, 2022 at 10:32 pm #262959
              fleetwin
              Participant

                US Member

                This is an odd failure indeed. Make sure the mag plate is tight and has no side slop. Perhaps the flywheel was rubbing on the flywheel which initiated the damage. Be sure to use the proper tool to set up the proper charge coil/sensor coil/alternator winding distance from the flywheel magnets. Be sure the engine wiring is in good shape also, stray voltage being inadvertently routed through that charge coil will cause this type of damage also.

                July 22, 2022 at 8:20 pm #263461
                Michael Anfossi
                Participant

                  International Member

                  As it is electric start, do you have the safety lanyard in place?

                   

                  July 23, 2022 at 5:50 am #263467
                  billw
                  Participant

                    US Member
                    Michael Anfossi wrote:

                    As it is electric start, do you have the safety lanyard in place?

                     

                    A good thought and a mistake I see people make many times. But I have to say that the charge coil is definitely toast, either way.

                    Long live American manufacturing!

                    • This reply was modified 2 years, 10 months ago by billw.
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