Problem with Optimus 8

Discussion in 'Stove Forum' started by Yannick Michel, Sep 8, 2021.

  1. Yannick Michel France

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    Hello from France

    I found an Optimus 8 with aluminum case. After having changed the wick and the gasket it works nicely. But I noticed that when it us too hot, there is a small flame escaping from the tube where there is the spindle. How to solve this problem please ?

    Thank you for your help,

    Yannick
     

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  2. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi @Yannick Michel . Nice stove!
    The control spindle operates through a “packing gland” which contains graphite. This is compressed by the hexagonal nut to prevent fuel leaking past the spindle during operation.

    The small flame that you see in operation indicates that you need to tighten the nut to seal the packing.

    You can do this while the stove is operating or after the flame is extinguished. Turn the nut clockwise until the nut is tightened but the spindle can still be turned.

    https://classiccampstoves.com/threads/fitting-replacement-parts-on-regulated-burners.8843/

    Best Regards,
    Kerophile.
     
  3. Yannick Michel France

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    Thank you Kerophile. It seems it is not possible to turn the nut clockwise more. When I removed the spindle and the nut should I see a graphite part in the tube ?
     
  4. Yannick Michel France

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    I ordered from a seller on Ebay based in England a graphite foil. How to use this foil to may be solve this problem of leaks near the spindle ?

    Thank you

    Yannick
     
  5. itchy

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    Hi Yannick,

    There is probably a BernieDawg video on Youtube showing this process on a Svea123 or Optimus 8R, but I cannot search for one right now. Basically, you cut a small strip of the graphite tape or ribbon and wrap it around the spindle to a thickness that seems about right (it goes between the washer and the stuffing box). Then reassemble. It will be compressed and should seal. It does not take much, so do not worry about a little trial and error before you get it right.

    That stove is a nice find.
     
  6. Yannick Michel France

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    Thanks Itchy.

    i will try that. I wonder if there was at the origin graphite inside the tube of this Optimus 8 (not 8 R). After removing the spindle I can’t see something inside the tube.
     
  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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  8. Yannick Michel France

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    Thanks Kerophile but I can’t see a graphite packing in my Optimus 8.
     
  9. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, It is quite likely that a previous owner removed the Pre-formed graphite packing or compressed tape.

    You do however need this graphite if you want the stove to operate as intended.

    There should be a specially shaped washer on the spindle shaft and then the pre-formed packing or rolled tape, then finally, the packing nut.

    I have given you a link earlier on fitting new parts.

    see also these instructions on using graphite tape:

    how-to-use-graphite-tape-on-optimus-111.45490

    Best Regards,
    Kerophile
     
  10. Yannick Michel France

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    Ok

    i can read a sentence in French which are speaking about amiante and not graphite. May be in mine, this part is used ?
     
  11. Yannick Michel France

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    Ok Kerophile
    Thanks a lot for these information.

    best regards

    Yannick
     
  12. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, Amiante or Asbestos should be avoided at all costs.

    An asbestos or asbestos/graphite composite might have been used as a packing substance at one time but I am unaware of its use on an Optimus No.8 stove.
    Best Regards,
    Kerophile.
     
    Last edited: Sep 8, 2021
  13. Yannick Michel France

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    I wonder if a graphite tape only could be used instead of the usual graphite packing ?

    and I have another question : i noticed also a flame getting out of the junction between the tank and the burner ? How to solve this other leakage ?? Sorry for my English if there is mistakes.

    Yannick
     
  14. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, your English is good.
    Yes, the graphite tape can be used to totally replace the packing required. It self-amalgamates as it is compressed and you can add more tape until the packing gland is sufficiently filled.

    As for the other fuel, what kind of seal do you have between fuel feed pipe and Op.8 tank base? is it a solder joint, a compression fitting or a threaded joint?

    Best Regards,
    Kerophile.
     
  15. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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  16. Yannick Michel France

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    Kerophile,

    ok. I will try the graphite tape when I receive it.

    concerning the seal between the feed pipe and the tank, please look at the photo. It is a threaded joint I think.

    Yannick
     

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  17. Yannick Michel France

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    Here is another photo :
     

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  18. hikerduane

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    Some thread sealant or copper based anti-seize on the threads should help. Give it a try.
    Duane
     
  19. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    PTFE TAPE?
     
  20. Yannick Michel France

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    Don’t you think both of you than the graphite tape could also solve this leakage ?