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150 johnson wont start when hot

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  • 150 johnson wont start when hot

    i have a 1996 150 johnson that wont start when hot, it sounds strange like it has no compression,but when it cools off it is fine,it runs just fine,any suggestions?


  • #2
    Re: 150 johnson wont start when hot

    hi hartwell i have a 1979 55hp evinrude with the same problem. Is your starter extremelyhot . my gets hot and after it cools down it will fire and run good. It just gets so hot i cant figure out what is the problem. I think with mine the heat causes the copper in the starter to expand and when it cools it contracts back to gether and will start

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    • #3
      Re: 150 johnson wont start when hot

      Howdy, Hartwell. One of the things that interferes with restarting the engine shortly after being shut down is poor tank venting. Try cracking your tank cap and/or pumping your primer bulb before you try her out.Another possibility is operator error. Do you choke/prime it when trying to restart when hot? Don't, you may be flooding it.Good luck.Red sky at night. . .JB
      sigpic

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      • #4
        Re: 150 johnson wont start when hot

        chasem: i dont think my problem is with the starter,it dont get hot or drag, your problem definitly sounds like starter but thanks anyway

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        • #5
          Re: 150 johnson wont start when hot

          j.b. cornwell: my engine soundslike it dont have compression when trying to start it, but i will try what you said, thanks

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          • #6
            Re: 150 johnson wont start when hot

            Hey Hartwell, Just to clarify, when you say "it sounds like it doesn't have compression" do you mean your engine turns over faster than normal? Have you run a compression check?Backlash

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            • #7
              Re: 150 johnson wont start when hot

              sounds like it is turning over fast like it has a compression release or something just sounds strange and i cant describe the sound, compression is good

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              • #8
                Re: 150 johnson wont start when hot

                am i answering these questions in the right manner im new aT this and not sure im doing it right

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                • #9
                  Re: 150 johnson wont start when hot

                  Hey Hartwell, That answered my question.......I'm at a loss to answer yours though . I've never come across anything quite like the symptoms you're describing & I'll be very interested to hear what's causing it. Please keep us posted. In the meantime, let me ask one more question. When you say the engine is hot, do you mean HOT as in overheated? Backlash

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                  • #10
                    Re: 150 johnson wont start when hot

                    no not overheating, just through normal use, ive talked to boat mechanic friends and they dont know either, but they all specialize in merc.

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                    • #11
                      Re: 150 johnson wont start when hot

                      are you getting spark when it does this could be your ignition power pack a friend had the same problem he had twin outboards so he tried the power pack from his other engine it solved his problem

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                      • #12
                        Re: 150 johnson wont start when hot

                        gregga: im not sure, but once it cools off and starts it will run perfect all day if you dont shut it off

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                        • #13
                          Re: 150 johnson wont start when hot

                          Hi hartwell,Is it possible that the starter bendix is not engaging? The starter motor would spin rapidly and make a stange noise that could sound like the motor is turning with no compression. The motor would not be turning over however. After the motor cools off the bendix could work freely again.To check this out pull the motor cover when the motor is acting up and see if the bendix is actually engaging the flywheel and turning the motor.To lubricate the bendix if this is the problem use a light silcon type lubricant that won't attract dirt. Good Luck,Bill.........

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                          • #14
                            Re: 150 johnson wont start when hot

                            byordy: the bendix on this motor is not out in the open but it is very possible that this is the problem , ill check it out, thanks\

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                            • #15
                              Re: 150 johnson wont start when hot

                              just cheking to see if there are any other ideas

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