Hk 500 flame leak mantle

Discussion in 'Pressure Lamp Discussion Forum' started by Ben r, Jul 28, 2026 at 8:36 PM.

  1. Ben r France

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    Hello everyone,
    I'm new to the world of pressure lamps. I recently restored an old Petromax HK500 from the 1960s.
    After having several air/fuel mixture issues, I replaced the entire vaporizer assembly (the part that goes down into the tank). I also correctly adjusted the gap between the jet and the mixing chamber.
    However, when I light the lamp, I get a small flame leaking around the ceramic burner where the mantle is tied on.
    I've tightened the mantle properly, but I can't figure out where the flame is coming from.
    Has anyone experienced this before or have any ideas what could be causing it?
    Thanks in advance for your help!
     

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  2. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Welcome aboard!:thumbup:
    The ceramic nozzle or the part which it screws into may be loose or both parts could be loose.
     
  3. Ben r France

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    Brûleur en céramique tout neuf et tout est bien serré. Je me demande si je fixe mal le manchon ? Y a-t-il d'autres causes possibles ? Merci pour votre réponse rapide !
     
  4. Ben r France

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    Brand new ceramic burner and everything is tightened properly. I'm wondering if I'm attaching the mantle wrong? Any other possible causes? Thanks for the quick reply! "
     
  5. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Those parts which I mentioned can loosen with use, the jet which screws into the top of the vapouriser can also loosen with use.
     
  6. Ben r France

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    I just assembled them just now
    "I have a video where it's clearer, but I can't send it here."
     
  7. Ben r France

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    I think I might not be tying the mantle properly, maybe that's where the leak is coming from, even though I tied it tight with a double knot
     
  8. podbros

    podbros United Kingdom Subscriber

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    Hi Ben + Welcome!

    videos have to be uploaded to youtube then a link provided apparently?
    sorry but IT is not my area

    looks to be working well apart from that though?? :thumbup:

    regards
    pb
     
  9. Ben r France

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  10. Ben r France

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    Thanks for your quick answers guys, that's super cool!
     
  11. podbros

    podbros United Kingdom Subscriber

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    You have very swift keyboard skills !

    ok, it may be just what happens when a new mantle is fitted? Often they have to ‘settle down’ or acclimatise so i would run it for an hour and see if it improves?
    when its cooled down check to see if the ceramic burner is loose?
    perhaps other members can offer advice
    cheers
    p

    edit** what type of mantle did you use btw ?
     
  12. Ben r France

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    Génération Z, vous savez
    D'accord, pas de souci, je vais le laisser brûler un peu.
    À votre avis, tout semble bien se dérouler jusqu'à présent ?
    Avez-vous des conseils sur la façon de bien fixer le manchon autour du brûleur en céramique ?
    J'utilise un manteau Petromax Helox
     
  13. Ben r France

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    Ok ?
     

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  14. Ben r France

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  15. Ben r France

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  16. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    That should not be happening and it's not a problem which I have come across, the jet may have loosened, that often happens with new parts, some collectors use thread locker on the jet's threads and then tighten it.
    Other members may have had that problem and found a cure for it.
     
  17. Reinhard

    Reinhard Germany Subscriber

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    It"s due to the burner. Einher too many of the small holes are blocked , or the burner is cracked innside the mixing chamber. You can't see that from the outside.
     

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