Johnson 5.5 CD-13 carb issue.

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  • May 15, 2015 at 8:06 pm #1499
    joshadurham
    Participant

      I went to barrel tune my 56 johnson 5.5 today, and found it to not tune properly, and run erratically. I pulled the cover off and sprayed starter fluid around the carb while it idled, and sure enough it choked out. Also while its running I can cover up both sides of the intake, and it doesnt pull hardly any suction, and remains running. Is there a common spot that these old outboards pull a vacuum? It has run beautifully up until a trip to the lake a couple weeks ago, when it decided to quit, then run again for a short while at low speed, then quit again. It progressively got worse until we eventually had to get towed back to the dock. impeller was pumping water the whole time. Got it home, and tore down the carb to inspect, and did a compression check, and all was good. Now its running, but not good. Any thoughts? Thanks.

      May 15, 2015 at 8:19 pm #16050
      Mumbles
      Participant

        There are drain holes in the bottom of the silencer so you won’t be able to kill the motor by plugging up the ends. If the carb and compression are ok, how’s the spark? If the motor has it’s original coils in it, I can guarantee they will be cracked and will need replacing. Cracked coils can let the motor run for a while but as they warm up they will start to fail. If you remove the inspection cover on top of the flywheel, you will be able to see what your coils look like. If they look anything like the ones in the picture, it’s time for repairs.

        May 15, 2015 at 8:33 pm #16051
        chuckw
        Participant

          US Member - 2 Years

          Never use starter fluid to start and outboard, they drain all the oil lube from the internals.

          May 15, 2015 at 9:08 pm #16052
          joshadurham
          Participant

            I just checked the ignition coils, and they look clean, and like new. They are green plastic, and look nothing like what you have pictured. Thanks for the suggestion.

            May 15, 2015 at 9:10 pm #16054
            joshadurham
            Participant
              quote chuckw:

              Never use starter fluid to start and outboard, they drain all the oil lube from the internals.

              I wasn’t using it to start the engine, I was spraying it around the carburetor while the engine was running to check for a carb vacuum leak. Thanks.

              May 15, 2015 at 9:23 pm #16056
              RICHARD A. WHITE
              Participant

                Lifetime Member
                quote joshadurham:

                quote chuckw:

                Never use starter fluid to start and outboard, they drain all the oil lube from the internals.

                I wasn’t using it to start the engine, I was spraying it around the carburetor while the engine was running to check for a carb vacuum leak. Thanks.

                Spraying around the motor while running is how they sometimes check for vacuum leaks on a 4 cycle motor. What happens is when there is a leak it sucks the fluid into the motor and it will rev higher….that means you may not be spraying it directly into the motor, but if it gets in there, it can still cause damage. Make sense?

                We just know from experience that one should never use that stuff on a 2 stroke..

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

                May 15, 2015 at 9:53 pm #16058
                joshadurham
                Participant

                  Ok yea that makes sense. Maybe it doesnt have a vac leak. Maybe its just getting enough ether through the intake to make the rpm drop. I could be looking at an ignition issue. How can I test the coils, other than the "see if theyre cracked" method? I have a multimeter. Thanks

                  May 15, 2015 at 10:01 pm #16059
                  RICHARD A. WHITE
                  Participant

                    Lifetime Member

                    Try this video…:

                    https://youtu.be/TbBCaZjXY-Y

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

                    May 15, 2015 at 10:35 pm #16060
                    joshadurham
                    Participant

                      Thats great thanks!

                      May 15, 2015 at 11:38 pm #16062
                      fleetwin
                      Participant

                        US Member - 2 Years

                        Well, the problem you describe could be caused by just about anything. Always start with the simplest basic stuff though.
                        I’m assuming you have checked compression, you advise the water pump seems to be working OK as well. Lets start with your fuel/oil supply, is it fresh this year? Have you checked the filter bowl for signs of water? The filter may be plugged also, even if it looks clean, you might try running it without the filter. Perhaps the pressure tank isn’t developing pressure or there is a leak in the pressure line. Try running the engine while pump the primer button, see if that helps.
                        The ignition system may look OK, doesn’t mean it is. You might try checking for spark when the engine quits and won’t restart, it should be able to jump a 1/4" gap.
                        I guess I have skipped over the simplest of solutions though, you may want to try a new set of plugs, even if your plugs are new, doesn’t mean they are any good.

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