Repairing stress cracks in founts

Discussion in 'Fettlers Master Class' started by loco7lamp, Nov 24, 2013.

  1. loco7lamp

    loco7lamp Subscriber

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    I had three AGM 256A table lamps turn up from Canada recently & as usual they were blighted by the dreaded stress crack syndrome :roll: which would usually mean the scrap pile :doh: , but i'm not having any of that nonsense oh no , not on my workbench [-X :D :thumbup:

    I have been getting an idea of how to try & sort out this problem having done similar work on a few stoves with the same problems :-k [-o<

    I know a few will frown on me for trying this but nothing ventured , nothing gained ](*,)

    So with nothing to lose i started by drilling a small hole at the top of the crack to stop it going any further ( if after nearly 80years it had only gone this far i reckoned i had a good chance of stopping it in its tracks ) this was done by hand using a pin vise/mini drill chuck holding a 1mm drill bit :D :thumbup: i also chamfered the hole slightly with a 2mm bit to clean up the edges :D :thumbup:

    1385335183-DSCF4879_opt.jpg

    Next job was to grind out the crack with a dremel type tool fitted with a mini 0.5mm thick cutting disc to a depth of about 1/2 to 3/4 mm [-o<

    1385335288-DSCF4881_opt.jpg

    The crack also went round into the inside of the rim & this was ground out too :D :thumbup:

    1385335314-DSCF4883_opt.jpg

    The area around the crack was then cleaned up to give a proper surface to work with & a smear of good plumbers flux was wiped into the cut/groove , a line of good quality electricians solder was then layed in ready to be melted into place with a mini propane torch [-o< :thumbup:

    1385335346-DSCF4884_opt.jpg

    I carefully heated the area around the crack slowly working the flame closer to the solder until it melted into place , then adding a little extra solder to leave a slightly proud repair , this could be polished away to leave a nice clean repair line [-o< :D :thumbup:

    1385335382-DSCF4886_opt.jpg

    I then did a full pressure test on the solder repairs to make sure i had a good seal all round first using the soapy water trial , then in the water bucket of truth [-o< :D :thumbup:

    No leaks found :D/ [-o< & the fount was left pumped up & after three hours still holding very good pressure :D :thumbup: , fuel was then added & a pressure leak down test was repeated to see if the fuel could still be found leaking , not a drip :D/ :D/ :D :thumbup:

    This fount had come with no burner so i fitted an old early Coleman twin mantle type to get the old girl running & this is where i'm up to so far :D :thumbup: A nice blue flame from the rebuilt vapouriser , but thats another story :whistle: :shock:

    1385336180-DSCF4893_opt.jpg

    & a couple of peerles mantles fitted 8) :thumbup:

    1385336310-DSCF4904_opt.jpg

    She still needs a bit of love & attention , but thats another old girl saved from the scrap & working like intended , dont give up on a stressed tank if the cracks are not too complex to sort out it's always worth having a go if your confident doing a repair yourself 8) :thumbup: , just make sure your happy with the pressure/leak down tests before adding fuel & firing it up :D :thumbup:

    Best regards , Stu :D :thumbup:
     

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  2. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Well fettled! :thumbup: :clap: :clap: :clap: :clap: :thumbup:
     
  3. Tony Press

    Tony Press Australia Subscriber

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    Great stuff! I like the groove to take the solder. A very good innovation.
     
  4. george

    george United States Subscriber

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    This is one of the best stress crack repairs I've ever seen! Well done, and probably a lot cheaper than POR-15! Some of these AGM lantern stress cracks want to make you break down and cry. I found an AGM lantern many years ago and I counted at least nine stress cracks! I gave up on the damn thing and it went into the junk parts box!
    I've been collecting pressure lanterns for well over 30 years and AGM seems to lead the field when it comes to this problem. Coleman, on the other hand appears to have conquered this problem. In all the years I have been collecting I found only two Coleman lanterns with stress cracks! Maybe I've been lucky?

    George
     
  5. X246A

    X246A United Kingdom Subscriber

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    I cant see why any one should frown at this life saving surgery.

    Another fantastic repair. You never cease to amaze me.

    Regards, Jeremy
     
  6. Digout

    Digout Australia Subscriber

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    Nice fettle :thumbup:
     
  7. StephanE

    StephanE Subscriber

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    A very good fettle as always Stu! :thumbup:
     
  8. ateallthepies

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    Nice work, I bet your blood pressure rose while dremelling the groove [-o<

    One more fount saved from the scrap heap :clap:

    Steve
     
  9. Matty

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    What a great way of repairing a stress fracture.
    I was looking for just such a tutorial.

    Thanks for sharing.
     
  10. Dean D

    Dean D Subscriber

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    Very good work, this gives me hope they can be fixed.
     
  11. ColinG United Kingdom

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    Damned nice work! I tried to do something similar on my Bialaddin fount but there were too many of them too close together.
     
  12. Norman

    Norman United States Subscriber

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    That's some mighty fine work you did there Stu thanks for sharing.
     
  13. phaedrus42

    phaedrus42 Subscriber

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    Very neat craftmanship, Stu! I wonder whether the tensile strength of the solder is high enough to prevent the joint from cracking after multiple pressure cycles. A leak could be rather problematic especially with gasoline.
     
  14. JonD

    JonD Subscriber

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    How we wish Stu @loco7lamp, a true master, would join us again.
    His inspirations are still doing their work.
     
  15. MYN

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    That is definitely the spirit we wish we have. It takes a lot of determination to accomplish such a feat.
    Its never dead till its dead.
     
  16. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Stu is still lamping, but his job keeps him very busy.
     
  17. Gloria

    Gloria United States Subscriber

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    I know this is an old post. Great job! As a welder I can tell you that is exactly how it should have been done.
     
  18. AussiePete

    AussiePete Australia Subscriber

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    It’s good to see Stu’s crack repair method. I’ve learnt a lot from it.
    There is so much expertise and experience amongst us.
    Cheers
    Pete
     
  19. ColinG United Kingdom

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    That is so true Pete. I've learned loads and got the confidence to attempt way more that I ever imagined!
     
  20. Mr cod

    Mr cod Subscriber

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    I've used this method to repair stress cracks on several bialaddins without any problems, still leak free a few years later.
    Regards ian
     
  21. Roy Allan New Zealand

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    Fantastic work, just been through this myself and it had already had a repair with soft solder.I used 15% silfos but left the welds proud.
     
  22. Roy Allan New Zealand

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    4F942F82-7D6D-4CA1-BE80-E8E23427701C.jpeg Cleaned up…. I didn’t want to grind the weld back
     
  23. X246A

    X246A United Kingdom Subscriber

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    @Roy Allan

    A good honest repair and now a part of this lamps history.

    Regards, Jeremy
     
  24. Roy Allan New Zealand

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    Thanks Jeremy, a hobby I should have found long ago
     
  25. Tony Press

    Tony Press Australia Subscriber

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    "... a hobby I should have found long ago". Definitely a confirmed case on lampelitis!

    There is no hope for you now, Roy. ;)


    Tony
     
  26. Roy Allan New Zealand

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    I agree,this is my AA anonymous group now.
     
  27. Roy Allan New Zealand

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    Did you get a tank for your Veritas 350 Colin?
     
  28. ColinG United Kingdom

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    I think I've got one lined up but if you've got one I'd definitely be interested. PM me.
     
  29. Roy Allan New Zealand

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    This is what I have but a little rusty 5ECAD5AB-3130-4DEB-BEEF-808E9B626C02.jpeg 562E8DD9-E33B-4D6B-BBEA-E3CCEA5016F4.jpeg
     

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