Optimus No 1S

Discussion in 'Optimus No:1(inc. S & J)' started by E.B.H., Oct 15, 2019.

  1. E.B.H. Norway

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    Found this Optimus No 1S with a reflector. The original heater cone was missing. I assume the one from E-bay makes it a Franken-stove? 20191015_150149.jpg 20191015_150053.jpg
     
  2. Tony Press

    Tony Press Australia Subscriber

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    That’s a fine stove/heater.

    Getting it working properly with a replacement part is good, in my opinion. It’s still a grand Optimus 1S.

    Tony
     
  3. Simes

    Simes Subscriber

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    I've not checked catalogues, but if it keeps you warm at 3am in Newark then what's not to like. :)

    A lovely heater, even if it turns out to be slightly un original.
     
  4. ArchMc

    ArchMc Subscriber

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    Gotta love the lion feet.

    ....Arch
     
  5. E.B.H. Norway

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    When first trying to fire it up I had problems with underburning and uncombusted fumes from the burner. I searched for leaks, but couldn't find any. Searching for solutions on the forum gave me some ideas. The problem was dirt inside the tank. The small particles clogged the nipple and the jetstream spread instead of going straight up under the cap.
    Cleaning the tank made wonders. No more underburning. Still have some problems with uncombusted fuel. Probably still some debris left in the burner.
     
  6. Tony Press

    Tony Press Australia Subscriber

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    @E.B.H.

    When you say “uncombusted fuel” do you mean the flame is very yellow/orange when the stove is running?

    If that’s the case, it could mean that the jet in the nipple is enlarged an needs replacing.

    If you need to clean the burner, first look to see if it has a loot of carbon in it. There are posts here about cleaning carbon from burners, but sometimes some carburettor cleaner and/or an ultrasound cleaner is enough.

    Cheers

    Tony
     
  7. E.B.H. Norway

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    No yellow flame. It was a tiny stripe of smoke beside the burner. The burner is brand new. No leaks in any treads. Small particles partly blocked the jet, and the gas spread.
     
  8. Tony Press

    Tony Press Australia Subscriber

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    Where abouts “beside the burner”? Near the spirit cup, the nipple, or the burner caps?

    Tony
     
  9. E.B.H. Norway

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    It comes from the nipple. If I pump up high pressure the stream from the nipple splits and it does'nt hit the tube under the cap. I have decoked the original burner and tested two brand new ones with new gaskets and copper paste. No leaks. It all comes from the jet, but in various directions. Pricking helps for a short time. It became much better after cleaning the tank, but there are still something left in the burner. Next step is flushing it with water.
     
  10. afoton

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    Pricking from the outside do help only for a short time. Debris is just pushed inisde the burner, and it will block the jet again in short time. Take the nipple out and clean both the burner and the jet.
     
  11. Tony Press

    Tony Press Australia Subscriber

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    @E.B.H.

    Obviously the fuel is hitting an obstacle coming through the jet.

    Take the nipple off and clean the inside, then use very fine sandpaper to clear any brass or carbon obstruction inside the nipple. Then use very fine sandpaper to clean the jet from the top. Then use the pricker to ensure the jet is both clear and circular.

    Tony
     
  12. E.B.H. Norway

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    Cleaning it up inside makes sense.
    By the way. It's quite fascinating.
    Discussing maintenance of an 80 years old devise with someone on the opposite side of the globe.
    I like it.
     
  13. Tony Press

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    :thumbup:!

    Have a good look at the top of the jet too, to make sure there are no burrs.

    Cheers

    Tony
     
  14. E.B.H. Norway

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    What it looked like when I found it. 20190510_204603.jpg
     
  15. E.B.H. Norway

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    Flushed the tank and the burner. No more underburning, but there were a second problem. Small clouds of unburned gas from the underside of the burner. It came out of the U-shaped holes under the cap. Used a hammer and carefully closed them. Problem solved.
     
  16. E.B.H. Norway

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  17. Liger Australia

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    Interested - What did you clean the inside of the tank with? Mine has just been emptied of the larger debris but still has a dusty residue inside. I’m reluctant to add fuel until she’s clean.
     
  18. Tony Press

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    Depending on the amount of junk inside the tank, first flush with soapy water until you see no more rubbish, then dry and flush with kerosene.

    If there's a lot of encrusted material, put some small nuts in the tank with the soapy water and shake them around.


    Cheers

    Tony
     
  19. Liger Australia

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    Thanks for the information. I’ll try that.
     
  20. E.B.H. Norway

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    I just flushed it with water, and let it dry.