Cylinder head shocking me 1957 35hp evinrude

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  • February 13, 2017 at 2:53 am #6337
    sqrl42
    Participant

      Discovered the hard way that my cylinder head is electrified.. Touch the top near the spark plug and it Kills the engine like a kill switch.

      Possible ark between spark plug wire connection and plug to head?

      February 13, 2017 at 3:08 am #52911
      reivertom
      Participant

        US Member

        Maybe an age crack in a plug wire?

        February 13, 2017 at 3:16 am #52913
        sqrl42
        Participant

          new wires and boots last year, no cracks.. top cylinder was having a hard time firing off under lode on the water. figure the shock has something to do with it.

          February 13, 2017 at 4:06 am #52920
          ray-schaber
          Participant

            Check the resistance from the head to the block with an ohmmeter. May be sealer insulating it from grounding.
            Ray

            February 13, 2017 at 1:52 pm #52928
            fleetwin
            Participant

              US Member

              touching the cylinder head kills the engine?? Do you get a shock as well? Does this engine have a stop switch? Is it electric start?
              I’m thinking you are correct, whatever is messing up cylinder #1 is probably to blame for this shocking situation as well….

              February 13, 2017 at 2:09 pm #52929
              sqrl42
              Participant

                Yes, touching the Cylinder head shocks me and kills the engine.
                No Electric Start
                No kill switch
                New cylinder Head installed a couple of days ago, I did repaint it before mounting.
                possible the head is not grounding with the block, is this an issue?

                I’ll take rays advice and do a resistance test this afternoon, if the weather holds up.

                February 13, 2017 at 3:34 pm #52933
                aquasonic
                Participant

                  Wouldn’t the cylinder head always be grounded to the block by the 10 cap screws. Even if sealant is used, there should be continuity between the head and block. Somehow the spark seems to traveling on the outside of the sparkplug. Have you tried another sparkplug?

                  Improvise-Adapt-Overcome

                  February 13, 2017 at 3:46 pm #52935
                  frankr
                  Participant

                    It seems almost impossible for the head to be electrified without the whole engine being likewise. It’s all bonded together by nuts & bolts. Very interesting.

                    February 13, 2017 at 4:30 pm #52938
                    Mumbles
                    Participant
                      quote Squirrel42:

                      I did repaint it before mounting.

                      The paint under the bolt heads could be the problem. I’ve never heard of it happening before but anything is possible.

                      Just thinking, but if the head had a poor ground, it would affect both cylinders, not just the one.

                      February 13, 2017 at 5:01 pm #52945
                      chinewalker
                      Participant

                        US Member

                        What plug wires are you using? How about plugs?

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