Soldering an Optimus 111 questions

Discussion in 'Fettling Forum' started by William H Smith, Jan 22, 2021.

  1. William H Smith

    William H Smith United States Subscriber

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    I need to repair a leak where the fuel tube goes into the lower part of the burner body, in the picture the screwdriver points to the leak, a solder joint, and there is where I need help. Reading other threads I have the idea to use Mapp gas and silver solder, but I am concerned the heat will loosen the other joints in the burner that are so close. Should I completely remove the tube, clean it up, and resolder or try and get some flux down into the failed joint and just get a drop of solder there? All advice appreciated, I have sweat copper pipe before but never anything this small or tight.

    Edit to add - this leak is a steady stream of bubbles when the burner is submerged, and I do not see any other leaks.
     

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  2. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Silver solder (silbraze) isn’t nearly so ready to melt as is lead solder of course and the other joints in nearest proximity will have been silbrazed and won’t quite get hot enough to melt and flow.

    Yes a MAPP torch and be sure to clean the joint to bare metal, borax flux.

    John
     
  3. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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  4. William H Smith

    William H Smith United States Subscriber

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    Thanks for the help, I've ordered the silver solder and flux and hopefully will have this fixed in a week or so.
     
  5. snwcmpr

    snwcmpr SotM Winner Subscriber

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    There are different grades of silver solder. Easy to hard. Easy has a lower melting point and can be a better choice for a repair near another silbrazed joint.
     
  6. William H Smith

    William H Smith United States Subscriber

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    I ordered the Safety-Silv 50 shown in the linked video, is that appropriate for this application?
     
  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, if you have ordered the silver braze and matching flux, recommended by BD, you will be good to go, once you have carefully prepared the leaking joint.
    Best Regards.
    Kerophile.
     
  8. William H Smith

    William H Smith United States Subscriber

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    Thanks, I have the solder on order, I think a local Fastenal has the flux in stock, but the store won't open till Monday morning. I still have to decide which torch set to buy, lots of options locally available.
     
  9. William H Smith

    William H Smith United States Subscriber

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    It certainly isn't the best soldering job but it doesn't leak now, and seems to be working, after the initial prime it burned a lovely orange that turned more blue with time, maybe it was burning off the brake fluid I flushed it with. I fired it up two more times today after letting it cool, no leaks and it looks to be burning nicely to my inexperienced eyes. Thanks for the advice and info.
     

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  10. CW

    CW United States Subscriber

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    Well done:thumbup:
     
  11. ROBBO55

    ROBBO55 Subscriber

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    Looks good to me. :thumbup:
     
  12. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Yes, job done.