Shinabro 340 burner repair

Discussion in 'Fettling Forum' started by Twoberth, Mar 23, 2020.

  1. Twoberth

    Twoberth United Kingdom Subscriber

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    I have probably fettled and resold/given away over thirty Shinabro 340s (I used to buy them in bulk from Scout troops), but I have never had one with a leaky burner until now. Next to the small Monitors this is probably my favorite stove, mainly because they are cheap and (usually) very well made - and the cases are bullet proof.

    This was a relatively unused stove and the burner was in good condition, except the flame had yellow tips. After closing the jet slightly to 0.28mm the problem still existed, except now there were only two yellow tip areas instead of four. These two yellow flame areas were diametrically opposite each other wrapping around the vaporisation tubes.

    Had it been one area of yellow flame I would have suspected a leak, but two areas still suggested either the jet size or grease/salts contaminating these two burner areas. After a thorough clean and a nipple replacement there was no improvement.

    I leak checked the burner using a rubber washer/ spring arrangement over the nipple hole,

    DSC09618.JPG

    and connected it to an air bed foot pump.

    DSC09617.JPG

    Sure enough two very small streams of bubbles appeared from the top of the two burner tubes when the pressurised burner was immersed in water.

    A quick braze on each and the burner works fine now with a nice blue flame.

    DSC09619.JPG DSC09620.JPG

    I suppose even Shinabro employees had bad days, but this is the first time I have had a problem with a Shinabro burner. If you have one, don't forget that the burner-to-riser joint (which secures the primer cup) is a left hand thread.
     
  2. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Caught me out first time!

    Well spotted fault and repair.