Primus no. 50 1939

Discussion in 'Primus No:50' started by JacobLotz, Nov 24, 2014.

  1. JacobLotz

    JacobLotz Subscriber

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    Hello,
    1416865043-2014-11-24_22_opt.jpg 1416865058-2014-11-24_22_opt__1_.jpg
    A couple of weeks ago i found this stove on a little market. It was in an old carton box wrapped in a newspaper of 1956. The tank is heavy damaged. Could I do anything about it?

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    It is marked AD which means ofcourse that it is built in 1939. It was quite hard to read the marking since it was almost gone.
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    Photo's of the windscreen and unused package of cleaning needles. The burner seems to have an additional preheating thing attached.

    In other posts I read it was a budget version stove. How should I preserve this burner? If you want to see any other photo's just let me know.

    Thanks!

    Jacob
     
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  2. kerophile

    kerophile United Kingdom Subscriber

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  3. presscall

    presscall United Kingdom Subscriber SotM Winner

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    Take a look at the redoubtable Albert Crackleport's restoration of one of these steel-tanked Primuses HERE if you have a taste for tracking down and eradicating the last trace of rust

    1416868188-1326649347-P1011885a.jpg

    John
     
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  4. Dutch_Peter

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    Hi Jacob,

    Good to hear from you! 8)

    For a start, you can try to see if it leaks. Pump a few times, put in a bucket of water and see where the bubbles appear.
    --> In most cases the pump leather can be revived by leaving it in oil for a day or so. Any oil will do, from cooking oil to motor oil.
    If you're lucky, it will hold pressure and can be used directly! :D/ However, in most cases the seals need to be replaced, most notably the NRV at the bottom of the pump tube. They can be a real problem to get out, best is to soak it in WD40 overnight, before taking it out.
    Also, since your tank is steel, rust particles from the tank will likely block the burner.


    I think the easiest way to resolve the rust is on this particular stove is to use acid. It's steel, not brass, so soaking in acid should not be a problem.
    Phosphoric acid is probably the best (personally I don't have experience with Phosphoric acid). As a cheap and easy solution, I have put rusty steel burner caps in vinegar (NL: schoonmaakazijn) for two weeks. A Liter of schoonmaakazijn costs 50 cents or less. The caps came out well, I can post a picture tomorrow evening if you like.

    So in my opinion, the easiest way to fix this stove is:
    1) Revive the pump leather and see if it holds pressure.
    2) See if you need to replace the seal in the NRV and see if you can take it out.
    3) Fill the stove with vinegar. Fill a plastic bag with vinegar as well. Put the stove in the bag and tie the bag. A see-through bag is best, then you can see progress. Leave the stove in for a week or 2. :thumbup:

    Hope this helps. If I've missed anything, then I'm sure I'll be corrected quickly ..

    Cheers,
    Peter


    Edit: Brass does not go well in vinegar. It leaches the zinc from the copper/zinc alloy that is brass. The brass may also crack. Please be sure to remove any brass parts (like the burner :mrgreen: ) from the steel tank, before putting vinegar on it. The NRV is brass as well.
     
  5. JacobLotz

    JacobLotz Subscriber

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    Many thanks for your advise!
    I think I will try DutchPeter's way. I am not sure what to do after that. Getting the nickel back seem quitte some work. Let me look at that first ;)
     
  6. Dutch_Peter

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    Hi Jacob,

    That I like 8) :thumbup: :mrgreen:
    After that, clean it out and get it running :D/ :thumbup:

    Cheers,
    Peter