Meva NRV removal?

Discussion in 'Fettling Forum' started by cazna, Nov 1, 2009.

  1. cazna

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    Hi i have a meva with a leaky nrv, not sure how to remove it, i have a nrv primus tool but the head on the meva nrv seems round?? so how do you connect a tool to it for removal, any advice would be appreciated, thanks.
     
  2. Spiritburner

    Spiritburner Admin SotM Winner Subscriber

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    Hi & welcome to CCS. I've split your post from the Meva catalogue post in the CCS library & placed it here in the 'Fettling Forum'

    I don't have a Meva to check but I'm sure someone who does will be along shortly. If it doesn't have a slot for a screwdriver & doesn't fit the Primus tool it may be worn.

    Can you shine a light down the pump tube & get a picture?
     
  3. Doc Mark

    Doc Mark SotM Winner Subscriber

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    Hi, Cazna,

    Welcome to CCS, Lad!! I have two Meva stoves, one older roarer burner, and one NIB, more contemporary, silent burner. The newer one (silent) has a fairly large, round NRV, which has a nice slot milled through the center of it, which should nicely fit a hollow-ground screwdriver, like a gunsmith would use. However, the older one (roarer) has a very small, round NRV, with NO slot in it, and I'm danged if I can figure out how someone would remove that one!! :shock: :shock: There must be some sort of proprietary MEVA tool that was made to do that, but I have NO ideal how it would work. My older Meva seems to leak at the NRV, too, just like your's, and I've just shelved it until I can figure out how to remove and rebuild that pesky, round NRV. I wish I could be of more help, but that's all I know about those stoves. Best of luck, and God Bless!

    Every Good Wish,
    Doc
     
  4. cazna

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    Hello, thanks for moving me to the right place( not so flash on finding my way around this site yet) The meva is a nice stove and seems a little less common, but shame about the round head nrv, it would be good to replace it for a nut head nrv, i have the removable leg model with a silent burner primus head on it, goes well apart from leaky nrv, hopefully someone out there has the magic trick.
     
  5. cazna

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    Hopefully this photos ok. See the nrv has a round head??

    1257057114-DSCF0694.jpg
     

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  6. bajabum

    bajabum R.I.P.

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    It looks like there was a slot there, long ago...
    You're probably going to have to unsolder the pump tube, and take it out from the other side!
    I've never done this, but braver souls than I say it's not hard.... :shock:
     
  7. RonPH

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    Looks to me like the actual head of the nut was sheered off leaving only the threaded portion in there. Well, another solution if you can carefully do it is using that tool screw extractor and fashion a long extension to reach into that hole. Worse scenario is really to remove the pump tube.

    Like this one which is only $3.00 (magic trick)

    http://www.sears.com/shc/s/p_10153_... & Dies&psid=FROOGLE01&sid=IDx20070921x00003a


    Do you guys agree?

    Ron
     
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  8. cazna

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    Hello, the end has got some muck on it, its smooth steel and seems undamaged, no sheared metal or damaged slots seem obvious, that thread tool might work but will i be able to fit another nrv into the thread? Im not to keen on pulling out the whole tube but nothing ventured nothing gained i guess.
     
  9. RonPH

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    Well, the screw extractor will work if the NRV has not seized up on the threads. If it has, you will really have to remove the pump tube completely. If you are lucky removing it with the screw extractor, I would suggest you make a sloted grove on it so you can easily remove it if it needs to be serviced again. And for obvious reasons it that you will have to use a screw driver to return the NRV.

    Ron
     
  10. RonPH

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    Cazna said

    That tool if carefully done will not damage the NRV or the thread but just unscrew it from where it is positioned. Once that is out, you may want to find a donor NRV that has the same thread and pattern that will fit into the pump tube.

    Ron
     
  11. Doc Mark

    Doc Mark SotM Winner Subscriber

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    Hey, Guys,

    I think he has one of the older Meva's, like my roarer, which has the exact same, small and rounded NRV head, that his has. There is no slot, period, and I see no way to remove it, short of unsoldering the entire pump housing. Exceter_yak, in his outstanding tutorial on this subject, shows how to do it. I have two pending projects which are going to need that action, but so far, have not created a workspace in which to get started! :oops: :oops: 8-[ 8-[ If time permits, I'll try to take a photo of my own older Meva, and you will see that it's exactly like Cazna's Meva. I'll try to include a shot of the newer Meva, with the larger, slotted NRV head. Take care, and God Bless!

    Every Good Wish,
    Doc
     
  12. cazna

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    Hey thanks everyone for your input, sounds like the screw extractor will be worth a shot before pulling out the tube, and i would be interested in seeing those pics, doc, if you get time, tricky thing to get a pic of, dosent seem to be many of these mevas about.
     
  13. Lance

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    If, when removeing the pump tube, it does not want to come free even though you know the solder to have been properly melted then there may exist a second solder joint inside the fount and this one is between the tube and the fuel pickup tube

    How do i know this? I'll be happy to tell/show you in another post later this week. :oops: :rage: :rage: :oops: :oops:

    lance
     
  14. theyellowdog

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    Sounds like a drag Lance! Another problem with tube removal I recently came across was on a monitor regal. The end cap of the pump tube was bigger than the hole on the tank I had to fit it through. I just forced it as it was a dead tank, not sure what I would have done if it was a good stove.
     
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  15. cazna

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    Hi yellowdog, i recently purchased a thermador silent burner from u on trademe, small world :) Tube removal will be a last resort on my meva, its a bit of a favourite i dont want to ruin, it was the dirtyest thing ever when i got it, cleaned up great, got a nice shape to it, im sure most people on here can relate to that :)
     
  16. theyellowdog

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    Hi cazna

    That thermador is a very nice one, glad it went to a good home.

    Tube removal is scary but it is the only way I will ever remove NRV'S that are stuck from now on. I have done one and it was very easy, you really can't tell it was done. Mucking around with easy outs and all that is fiddly and may not work, pump tube removal will work... but I would wait as someone may come along who know how to remove meva NRV'S.

    Dan
     
  17. Gordon F

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    Cazna, sounds as though you're in a pickle there.
    The trouble with screw extractors is, that as they are a taper, they expand the part that they are screwing into, making it tighter.

    This is probably more so in soft brass. They also some times snap off, giving you an even bigger problem, less likely to snap off in brass I suppose, as they can keep on cutting into the soft brass.

    I would pull the tube every time, though dangers also lurk there, as Lance has said.

    How did that happen Lance? Do you think it was accidental? maybe solder running down one of the tubes?

    Anyway, good luck with the Meva.
     
  18. Lance

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    No Gordon the stove was built that way. How i know about the solder to the fuel tube is an all together different story and is one of my most embaressing moments is fettling. Just think of it as the biggest OOOOOOOOOPS you can have.

    I will reveal all when i figure out how to get pix into this new system.

    lance
     
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  19. cazna

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    Just an update on trying to remove the meva nrv, i gave it to a mate who is a fitter and turner and he tryed to remove it with a easy out tread screw thing as above and it sheared the whole end cap off the brass tube so looks like it could be scrap now :( oh well might as well try and heat it up to remove the tube, might be able to solder on another cap and thread it to fit another nrv if im lucky.
     
  20. fyldefox

    fyldefox R.I.P.

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    Cazna, blow lamps are a good source of parts or indeed the pump tube complete. Good luck with the repair.