Yellow flame Optimus 111T

Discussion in 'Fettling Forum' started by burny pyromaniac, Apr 16, 2019.

  1. burny pyromaniac Netherlands

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    Dear friends,

    I recently found an Optimus 111T at leboncoin.fr, at a very reasonable EUR 50.
    It arrived two days before my summer holiday, and I took it to accompany the other Optimus 111T I already had.

    Alas it started to develop a very yellow flame after a few days.
    Back home I fitted a new nipple and ordered a new inner and outer cap for the silent burner.
    This does not help solve my problem at all. The flame remains very yellow, which wouldn't be a very big problem if I only would use a high flame: when a pan is on the stove, there remains little yellow, but when I temper the flame, it is not acceptable.
    Does anybody know how I can cure this?

    Greetings, Tonio

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  2. Tony Press

    Tony Press Australia Subscriber

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    @burny pyromaniac

    1. What fuel are you using?

    2. Does the flame leave smudgy soot on your pot?


    Tony
     
  3. burny pyromaniac Netherlands

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    Hi Tony,
    I am using paraffin, and preheat with meths. It doesn't leave any soot. Tonio
     
  4. kerophile

    kerophile United Kingdom Subscriber

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    Hi @burny pyromaniac

    Have you replaced the jet, and both burner caps before you took the photos?

    If you have, and the problem persists, it looks like the burner body itself is at fault.

    Is the appearance of the flame uniform around the burner, or is it bigger and more yellow at one point?

    If it is non-uniform around the circumference of the burner cap this suggests that excess fuel is being fed to that area.

    Have a read of this thread:

    Optimus 111T burner fault - A mystery solved!

    What do you think?

    Best Regards,
    Kerophile.
     
  5. burny pyromaniac Netherlands

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    Hi Kerophile,
    I did change the nipple and caps before taking the pictures. The flamepattern is not even all around, with more yellow at one point. I will study your link, thank you for that.
    Tonio
     
  6. Timothy Epp

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    I can't offer much stove wisdom, but I am interested to know where one can order a new inner and outer burner cap for a 111T?
    Thanks
     
  7. rik_uk3

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    Empty the fuel tank, rinse with warm water and let it dry giving a final rinse with alcohol. With clean fuel in it burn a couple of tank fulls which may shift any carbon that has built up and make sure the inner and outer cap are sell seated on the burner.
     
  8. burny pyromaniac Netherlands

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    I had the nipple as a reserve and ordered the caps from a dutch company, but after having had to wait for six months (!) I cancelled the order and ordered from basecamp. After a week I received the caps from the UK.
    Tonio
     
  9. burny pyromaniac Netherlands

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    I noticed that at first the stove burns better, but after a while it turn more yellow. I wil study the link from @kerophile and suspect he points out the problem accurately.
    Tonio
     
  10. kerophile

    kerophile United Kingdom Subscriber

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    Hi @burny pyromaniac when next you run your stove it would be a good idea to mark with a scratch the sector of the burner where the flame appears over-fuelled.
    Later, when you examine the burner with caps removed, you have a better chance of finding a tight crack or similar, which can than be repaired.

    Best Regards,
    Kerophile.
     
  11. burny pyromaniac Netherlands

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    Thanks. I did some testing, but up till now found nothing that appears to be a leak of some sort. As an interim measure I now fitted a spare roarer burner. Now I stumbke upon another thing: how do I remove the preheat-cup??? The nut is completely round... 1557079994800711213993.jpg
     
  12. burny pyromaniac Netherlands

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    My spare burner does not have a cup fitted
     
  13. afoton

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    Just spin the cup around and off it get.
     
  14. burny pyromaniac Netherlands

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    Alas, the cup spins, but not the nut...
     
  15. kerophile

    kerophile United Kingdom Subscriber

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    Hi, as I recall there is a small, thin lead washer underneath the round nut. If you can wedge or glue the spirit cup to the nut you can then grip the cup and unscrew them together.
    The lead washer stops leakage of priming spirit.
    BASE CAMP offers these:

    2201 Spirit cup for 111, 199 £5.30 GBP

    Best Regards,
    Kerophile.
     
  16. kerophile

    kerophile United Kingdom Subscriber

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