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1996 J40TLEUC Valve Identification?

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  • 1996 J40TLEUC Valve Identification?

    I recently purchased a 1996 Johnson 40HP J40TLEUC outboard and have been having some issues I was hoping someone could shed some light on.

    Whenever I start the motor the first time for the day I need to remove the cover and turn the red dial (pictured) far to the left. Once the engine starts I need to turn the red dial back to the right and after this point the engine will start without fail for the rest of the day.

    Recently another problem arose which was that the engine, after hitting rough water and choppiness would bog down and even with the throttle at max, would run almost like it was in idle. I have to open the case again and jockey this red dial to get it to go faster. Yesterday I realized the the black knob attached to the red dial which loosens and tightens it had been bumped tight. Once it was loosened the motor stopped bogging down.

    I have the Service Manual for this motor but nowhere can I find what this red dial is or how it should be adjusted? If anyone can point me in the right direction so I can research further it would be greatly appreciated. Thanks in advance!


  • #2
    image

    here is an image of the red dial in question
    Attached Files

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    • #3
      (Fuel Primer Solenoid Function)
      (J. Reeves)

      The RED lever...... The normal operating/running position is to have that red lever positioned over top of the solenoid and aimed at the other end of the solenoid, gently turned to its stop. This is the normal/automatic mode position. Pushing the key in opens the valve within the solenoid allowing fuel to pa$$ thru it in order to prime and start the engine. Looking upon this solenoid as a electric choke results in a better understanding of it.

      Having that red lever turned in the opposite direction, facing away from the solenoid, allows fuel to flow thru it to the crankcase area. One would only turn the red lever to this position in a case where the battery might go dead and the engine had to be started via the rope pull method. Look upon putting the red lever in this position as moving a choke lever on a choke equipped engine to the full closed position. Either one would supply fuel to the crankcase/engine for starting purposes BUT if left in that position while running would flood the engine.

      The later model primer solenoids are equipped with a schrader valve, used for attaching a pressurized can of fogging oil etc, available at your local dealership with complete instructions.

      Pumping the fuel primer bulb up hard fills the carburetor float chambers of course, but that process also applies fuel pressure to the primer solenoid.

      The two small hoses leading from the primer solenoid branch off via tees to each fuel manifold section that would feed fuel to the individual cylinders.

      Pushing the key in activates the primer solenoid to allow fuel to flow thru it to the intake manifold pa$$ageways. Cranking the engine over causes the fuel pump to engage which in turn sends fuel pulses to the primer solenoid via the 3/8" fuel hose.

      Some engines incorporates the "Fast Start" feature which automatically advances the spark electronically so no advance of the throttle is required for starting.
      Engines that do not have the "Fast Start" feature will be required to have the throttle advanced slightly.

      Starting procedure: pump fuel bulb up hard, crank engine and push the key in at the same time. When the engine fires/starts, release the key so that it falls back to the run position.

      Bottom line..... Look upon the primer solenoid as an electric choke.

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      • #4
        Thank you so much for such a detailed response! Although I'm relatively new at working on these motors this gives me a fantastic start to begin my research on what's happening. Really appreciate your help!

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