NRV Primus 1957 N°2

Discussion in 'Fettling Forum' started by Tracer, Dec 4, 2011.

  1. Tracer

    Tracer Subscriber

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    This week I received the NRV tools from Stu (thanks again Stu), so time to get the 1957 Primus N°2 in action.
    When I removed the NRV it didn’t look liked expected.
    The shape was different and the pip was gone :-k
    This pip/rubber is tube/hose shaped.
    I haven’t found a way to unscrew it in multiple pieces so your help would be appreciated.
    Don’t know if there’s a secret door, I’m guessing now it’s one solid piece and the new rubber is so flexible you can assemble it from the end up.

    Does anybody have seen this before and have an idea how to get in working order again?

    Foto-7PM7OJIE-D.jpg

    And here next to a "normal" NRV

    Foto-PTGHZKKL-D.jpg
     
  2. Wim

    Wim Subscriber

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    Hi all, Erwin showed me this pip yesterday, and it's the first time I've seen one like this. His problem is, he can't get any air into the fount. My guess is (and yes, I'm only guessing so might be totally wrong) the short rubber hose has hardened locking off any holes that might be in the "body". I'm sure someone will tell us all about this NRV!

    Best regards,

    Wim
     
  3. Riddarn

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    Oh, that was a new model.. :-k
    I would guess, that the body of the NRV is a solid piece,
    no moving parts, and a channel from the top,
    to "under the hose". So that the air can slip under the sleeve.
    If the rubber sleeve hardens then it cant "open".

    Could that be a good guess?

    I think that You refurbish it with just changing the short piece of rubberhose,
    and it will be as new.

    Best regards

    Uffe
     
  4. Wim

    Wim Subscriber

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    Hi Uffe, that's what we guessed too! I wonder if this was a "new" model that was not very succesfull. The sealing depends on the flexibillity of the short rubber hose-pip. To soft, no seal. To hard, to good a seal (impossible to let air in).

    Surely, someone out there must know more about these?

    Best regards,

    Wim
     
  5. Tracer

    Tracer Subscriber

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    I start to believe I have a unicum here. :-k
    Strange, because the stove is from 1957.
    Normally you would think that all the later models manufactured are also equipped with this kind of NRV.
    Or they quited directly after they noticed this NRV was not wat expected.
    Maybe it's worth thousand of dollars :D/
     
  6. Longilily

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    Erwin

    Are the external threads the same for both NRV's ?

    Ray
     
  7. Tracer

    Tracer Subscriber

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    Wim suggested this also, we think the threads are the same, but thats not a challenge :lol:

    I waited for reply's from somebody who knew the model NRV, and how to fix it or a adress for a new "pip"
    Wanted to keep the switching style NRV's option for the last.
    We like to know more of this special NRV, (and bring the N°2 in original condition).
    The risk messing up the threads in the burner tube is a danger, but probaly the only solution.
     
  8. Tracer

    Tracer Subscriber

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    Honey i'm home!

    No, i don't want to eat right now.

    I wanna look if the thread of this NRV is the same as this one (girlfriend is shaking her head now) [-(
    It looks the same honey!

    Great! You wanna eat now?

    No, because it looks the same, it doesn't mean it is the same! I must screw it in! [-o<

    And yes, we have a winner, threads are the same!

    Now i have to eat a cold dinner. But I'm a lucky men! :D/
     
  9. Longilily

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    Congratulations :clap:

    Worth a cold dinner i would of thought :lol:

    Atleast now you can move forward :D/
     
  10. Wim

    Wim Subscriber

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    Just bumping this tread, has none of you all seen this kind of NRV before? Sure there must have been more than 1 stove that left the factory with this type of NRV! My 1957 (AW) Primus N°5 had the "standard" type.

    Best regards,

    Wim
     
  11. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Wim, I have seen very many Primus and Optimus NRVs and I have never seen one like this before.

    Best Regards,
    Kerophile.
     
  12. RonPH

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    Thats a weird looking NRV there. First, does the bottom part of the NRV turn? If it does not then its just a slip on hose that goes over the hole hidden beneath the hose. Where to find a nitrile hose is a problem. If the bottom turns, then there may be a catch if you apply a bit of inward pressure and turn it whichever way to release it though its doubtful. Only way to find out really is to cut the hose and see :shock: Either way, it would be best to just replace it with a standard NRV and keeping that piece as a collectible with the cut hose in place.

    My 2 cents worth.

    Ron
     
  13. Wim

    Wim Subscriber

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    Hi George, this looks more and more like a one-off, maybe it was never intended to be installed in a stove that left the factory. This must be top-secret prototype material! :D/ ;)

    Hi Ron, Erwin replaced this NRV with a spare "normal" one, and I think he'll pamper this one for the rest of his days! :lol: 8)

    Best regards all,

    Wim
     
  14. Tracer

    Tracer Subscriber

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    Well, let's say it can take some time, but i don't give up easily.

    Ron, no turning parts, one solid piece.

    I spoke to my father in law about this, and he had some orange tube with almost the right dimensions being 5mm inner and 8mm outer.
    I put the hose in a glass of kerosene to see how it react. If it doesn't solve this week, I'll try the original with the new hose and see how it performs :thumbup: .
     
  15. redspeedster

    redspeedster United Kingdom Subscriber

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    Looks like the valve thats in a football to me.