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  • miller diesel shutting down?

    I have a Miller Big 40 diesel welder, I believe it is a 1986. I have had it for 10 years with no problems to speak of. Recently I started it up as I do at least once a month to let it run, it ran for about 10 minutes and shutoff. I restarted it and it runs about 5 seconds and shuts off? It will crank right back up, but shuts down after about 5 seconds. I checked the fuel pump and it is working correctly. Anyone have any ideas what could be wrong. I'm leaning toward a bad low oil pressure switch. Thanks for any suggestions.

  • #2
    Originally posted by jdhartin View Post
    I have a Miller Big 40 diesel welder, I believe it is a 1986. I have had it for 10 years with no problems to speak of. Recently I started it up as I do at least once a month to let it run, it ran for about 10 minutes and shutoff. I restarted it and it runs about 5 seconds and shuts off? It will crank right back up, but shuts down after about 5 seconds. I checked the fuel pump and it is working correctly. Anyone have any ideas what could be wrong. I'm leaning toward a bad low oil pressure switch. Thanks for any suggestions.
    3 things shut it down,

    lack of fuel
    low oil pressure, c
    coolant temp too high

    check the gages, most have another little adjustable ground needle inside of them. when the check needle happens to hit it. the Murfy shuts the engine down

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    • #3
      Plugged secondary fuel filter. It's located just under the fuel tank. Just take the paper filter out and run it and see if that fixes it.

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      • #4
        Miller big 40 diesel shutting down.

        Originally posted by 1997CST View Post
        Plugged secondary fuel filter. It's located just under the fuel tank. Just take the paper filter out and run it and see if that fixes it.
        Determined that fuel is the problem, checked secondary fuel filter doesn't have one under fuel tank. Replaced screw on type fuel filter and electric fuel pump. Still shutting down, by passed oil pressure switch and temp switch to see if that was the problem. Still shutting down, something is stopping the fuel flow after engine runs for maybe 5 seconds?

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        • #5
          Fuel soilinoid on the side of the injection pump. likely, either not getting the 12 volts to open it or may be defective. Murfy switch fuse ok?

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          • #6
            Miller Big 40 diesel shutting down

            Originally posted by cruizer View Post
            Fuel soilinoid on the side of the injection pump. likely, either not getting the 12 volts to open it or may be defective. Murfy switch fuse ok?
            The fuel pump is tied into the wire going to the solenoid on the injection pump and it is running when the switch is on and continues to run until the pressure is up to cut off pressure. S I assume the solenoid is getting power. I replaced a 14 amp fuse on the behind the control panel that was blown, but it's still doing the same thing. Last time I sprayed starting fluid in the air in take when it tried to shutdown and it continued to run, so apparently something is shutting down the fuel?

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            • #7
              Well, if that fuse is blown , the likelyhood of the murfy being blown is pretty good, , now if you remove the solinoid. The unit should keep on running, or put 12Vdc to the solinoid, the unit should keep on running till you removed that 12 Vdc signal.

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              • #8
                Miller big 40 diesel shutting down

                OK, are saying remove the injection pump solenoid and the fuel pump should continue running? Not sure I understand. Also what is the murfy? I pretty mechanical inclined I retired from a Chemical Plant and work as a Maintenance. Mechanic there. But I'm not familiar with a diesel welder other than welding with it. I appreciate you taking the time to help me.

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                • #9
                  Originally posted by jdhartin View Post
                  OK, are saying remove the injection pump solenoid and the fuel pump should continue running? Not sure I understand. Also what is the murfy? I pretty mechanical inclined I retired from a Chemical Plant and work as a Maintenance. Mechanic there. But I'm not familiar with a diesel welder other than welding with it. I appreciate you taking the time to help me.
                  There is only a plunger behind the shutown solinoid so if you remove it nothing is going to fall out. First though I'd try putting positive battery voltage to it, to see if it is working.

                  That fuse you replaced on the block behind the panel is the "Murfy" switch. It tells the engine that you have oil pressure and if the coolant temp is ok. Being that the fuse had failed, the likelyhood of that assembly being pooched is pretty good. If its not working then the engine will start and stop shortly after.

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                  • #10
                    The 5 seconds your getting is the time allowance for the unit to sense oil pressure

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                    • #11
                      miller diesel shutting down?

                      I really appreciate your help with this problem. I'm out of town right now, Friday I will do some more trouble shooting with the information you have given me. I'll let you know what I find out. Again thank you for you help.

                      J.D.

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                      • #12
                        miller diesel shutting down?

                        Well I got back in town, checked the murpy switch (shutdown switch). I believe it is working when I press the button the electric fuel pump comes on and I get 12 volts at the solenoid to the fuel injection pump. What I'm not sure of is if the fuel injection pump is working? Not sure how to check that. Also the engine starts now and shuts down immediately instead of running 5 seconds as before? Any suggestions?

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                        • #13
                          Easy....

                          Originally posted by jdhartin View Post
                          Well I got back in town, checked the murpy switch (shutdown switch). I believe it is working when I press the button the electric fuel pump comes on and I get 12 volts at the solenoid to the fuel injection pump. What I'm not sure of is if the fuel injection pump is working? Not sure how to check that. Also the engine starts now and shuts down immediately instead of running 5 seconds as before? Any suggestions?

                          Do what cruiser said, do not assume, verify that there is 12 volts at the fuel solenoid, with the solenoid connected, if you have voltage remove the solenoid, apply voltage to the solenoid, the solenoid plunger should suck in(will have to ground solenoid to get it to do it). If it does not go in its bad, also with the solenoid removed the engine should start, but u will need to screw the solenoid in to kill it. If that fails the rack is stuck in the pump. If the rack is stuck take it in, it's easy to fix, but also very easy to screw up.
                          Kevin
                          Lincoln ranger 305g x2
                          Ln25
                          Miller spectrum 625
                          Miller 30a spoolgun
                          Wc115a
                          Lincoln 210mp
                          F550 imt service truck

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                          • #14
                            Miller diesel shutting down?

                            I'll try that tomorrow, thanks!

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                            • #15
                              miller diesel shutting down?

                              Does it have a continental Diesel engine? I had a similar problem with my trailblazer 55d. I had to take off the injector pump and have it rebuilt. Fixed the problem right away

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