Primus 110 burner repair

Discussion in 'Fettling Forum' started by marcovp, Nov 23, 2009.

  1. loco7stove

    loco7stove Subscriber

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    Me too . my model "A" Boxford is from the 1950's & my Centec 2A mill is from the same period :D 8) :thumbup:

    Stu :thumbup: .
     
  2. Wim

    Wim Subscriber

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    Er, my lathe is a pre-war model (in my case, pre-WW1 ;) :lol: )

    Best regards,

    Wim
     
  3. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Kerophile had a spare pricker tip he's happy to contribute to the project.

    Not an easy fix for the broken one. Yes, a lathe would provide the precision (though tricky to hold it securely in the chuck without crushing the threads) but the residual pricker wire at the core would make a micro-drill run off-centre and break.

    John
     
  4. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Brazed up and whole

    1322326297-6.JPG


    Here's an offcut of the brass tubing I used alongside a remnant of the original steel vapouriser tube which held out for 78 years as Marco's said, but I'd guess with not much of a margin of safety for the past twenty years or so

    1322326307-7.JPG


    I was keen to try the burner out on my Primus 107 stove, which takes this burner type, but Marco's 110 has a taller riser tube and consequently a longer pricker rod, so I couldn't use the rod in my test-bed stove (the pricker rod in mine and the burner itself are reproductions based on a cut-and-shut Phoebus 625 and the pricker rod wouldn't fit Marco's burner).

    However, without the rod the burner overfuels, since as well as it's jet-cleaning function, it constricts the fuel flow ...

    1322326315-8.JPG

    1322326323-9.JPG


    ... In smaller versions of the lipstick burner series - 96, 100 - the vapouriser tube's stuffed with a roll of brass gauze to hold the fuel flow in check (and help with heat transfer).

    One other detail, the jet hole size in the vapourising tube on a 96 and 100 stove also is 0.23mm. On the Primus No.4047 burner with which the 107 and 110 stoves are equipped, there's a removable jet nipple and the jet orifice is 0.32mm.


    So, without the pricker rod in place, I resorted to a roll of brass gauze inserted in the vapouriser tube, which worked fine

    1322326335-10.JPG

    1322326343-11.JPG


    With George's (kerophile's) spare jet cleaning tip installed, the burner's good to go. Satisfying, keeping another classic stove in circulation for another umpteen years!

    John
     
    Last edited by a moderator: Jun 26, 2015
  5. marcovp

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    That looks really great. Can't wait to try it on the 110 :lol:

    Good to see how thin the walls where. Makes me think that this was going to happen anyway.
     
  6. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Absolutely, Marco. The rot had set in years ago.

    Great opportunity for me to get a broken example of the burner to see the 'innards' of. I conclude that Primus hadn't got the design and materials right, which might explain why it wasn't in production for long.

    The steel tube had corroded from the inside, like a rotten old car wing.

    Most of the lipstick burners I've seen have been thin-walled steel on a brass tank mount.

    I suspect that Primus just went along with that combination of materials for their #4047 burner, without realising that the lack of a detachable burner bell put stresses on the steel-brass brazed joints that made them doomed to fail ... albeit some 78 years later.

    The literature in the Stove Ref Library on this burner makes mention of the benefit of being able to scrape the vapouriser tube clean, and a special scraper was an accessory. The scraping can't have helped longevity either.

    John
     
    Last edited by a moderator: Jul 2, 2015
  7. Tantra

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    I
    have a primus 4047;
    I don’t know how to put needles in correctly position
    My control rod only move 5 degrees
    It’s right or not
    The thread is leak also I believe thread reason
    What should I do
    And I run gasoline too
    Every parts and tank catch flame
    I blow down the fire by mouth
     
  8. Tony Press

    Tony Press Australia Subscriber

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  9. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Please, don’t. Kerosene only.

    There’s no regulation of the burner, the control knob only operates the jet pricker. 5 degrees of movement isn’t far off what it should be but check that the pricker rod inside the burner tube isn’t sticking for part of its movement. The pricker rod has a toothed rack at the fuel tank end, engaging with a pinion on the control spindle. Check those for full movement and damaged pinion or rack teeth.

    The jet pricker tip is the size of a grain of rice (ok, a bit larger maybe) and threads on it screw into a tapped hole at the end of the pricker rod.
     
  10. Tantra

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    B022C44E-9CB1-4176-9879-182E3EBEE7FC.jpeg B96803D6-995A-4D39-9A88-8293EF60E2C5.jpeg
    Thank you
    He can burn well if I throw away another parts only keep bells
    He run very well by gasoline
    Of course it’s not safe
    Only test expendition
    My metal tube also leak gas
    I believe the brass and iron tube not easy welding
    Half years ago I have a bad 4047 then I know how to clean
    At last I cut it and made Optimus 8X
    Primus 4047 is power strong and interesting burner for me
     
  11. Tantra

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    I get
    him from two primus 117 stove
    Now I have full of two tank and burner