AGM 3927 fettle

Discussion in 'Fettling Forum' started by Mantis, Jan 25, 2013.

  1. Mantis

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    Have just acquired my first AGM lantern, a double burner. The generator needle has broken and I'm sure I could replace it with a Coleman one. If the jet proves to be worn, would it be possible to replace the generator with a Coleman 242b one?
    My investigation suggests that it probably runs on white spirits, is that correct?
    The lantern has a steel tank and is in a filthy rusty state so this is going to be a good reconditioning job and fettle.
     
  2. Mackburner

    Mackburner United Kingdom RIP - Founder Member

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    3927 is a 300 cp gasoline lantern. I amnot sure if a Coleman generator will fit and work. Often AGM pricker rods have a differenrt fitter type but I can't remember if this applies to this model. ::Neil::
     
  3. Mantis

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    Thanks for the info. For reference here is the lantern in it's current state. Am looking forward to bringing this back to respectable condition and operating.

    1359238066-AGM_3927.jpg
     

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  4. Mantis

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    After disassembling the lantern I discovered the injector needle control shaft had broken off :cry:
    I have managed to remove the lead packing around the remaining part of the stem. Have heated the unit with a gas torch and dipped it into water, then using sharp-nosed pliers have tried to get it to turn but with no luck. Does anyone have any suggestions on how I might be able to remove the injector needle control section?

    1359845372-P2030531.jpg
     

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  5. pete sav

    pete sav Founder Member

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    It must be well tight if heat quench dont ease it off.
    Maybe try some sort of penetrating fluid let it soak in overnight then heat up the brass part hot as you can but not till red and try to turn the central shaft with pliers dont quench it hope it moves it but this is not going to be a easy one make sure you dont snap off what you have let to hold on to. i am assuming this thing screws out??good luck

    pete
     
  6. Mackburner

    Mackburner United Kingdom RIP - Founder Member

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    These are often real tight if the valve was left in the closed position for years. These needle valves work by wringing the taper needle into the hole and they are so tight that no gas can escape. This means the metal to metal seal is almost as good as a weld. I would repeat the heat and quench several times because that is about the ony way this will ever release. The alternative is going to be to drill it out and then you may well have to re tap the threads but you also have to be careful you don't drill too far and enlarge the gas port hole. ::Neil::
     
  7. Mantis

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    Once freed up should this rod unscrew out or can it be pulled directly out?
     
  8. Mackburner

    Mackburner United Kingdom RIP - Founder Member

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    They are screwed in. The thread you can see is for the gland packing nut. The rod will have a smaller fine thread at the end which is buried inside the casting. ::Neil::
     

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