First attempt at a GK jet...

Discussion in 'Fettling Forum' started by Murray, Jun 19, 2020.

  1. Murray

    Murray Subscriber

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    was a failure. Leakage past the threads - the threads are a bit dodgy in spite of using a tail-stock die holder. The angle on the mating surface looks a bit wrong - need another form tool I think.
    Not sure how to measure the angle actually - I'd welcome suggestions. jets.jpg yellow_flame.jpg real_jet.jpg
    And finally, the 0.3mm drill from the MicroBox I measure at 0.48mm, which is a bit distressing.
    The pictures show my jet compared with a real one, the the blaze of yellow flame on an MSR GK with my jet, and the stove working properly with a G jet ( running on kero (reduced odour petrole here in France).

    Regards
    Murray
     
  2. Murray

    Murray Subscriber

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    jet2.jpg
    My second attempt is considerable improvement - better concentricity, better thread, drilled with a carbide 0.3mm drill so the jet can be pricked with a 0.27mm pricker without much play.
    I still have a leak at the valves seat even though the angles look very similar to a production jet.
    Does anyone have any advice?

    Regards

    Murray
     
  3. Murray

    Murray Subscriber

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    A smear of copper grease is a bit unprincipled but got the stove burning blue with the new jet. blue1.jpg blue2_small.jpg
     
  4. Twoberth

    Twoberth United Kingdom Subscriber

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    Very well done.
     
  5. snwcmpr

    snwcmpr SotM Winner Subscriber

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    Mark the angle on the jet and tighten into position. Maybe a Sharpie or Dykem.
    Remove and see if the metal makes contact all the way around.