Please educate me.

Discussion in 'Fettling Forum' started by E.B., Dec 9, 2019.

  1. E.B.

    E.B. Subscriber

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    I am a Coleman guy who is making his first foray into the paraffin world with an Optimus 96L of late 60’s vintage, so I beg you excuse my ignorance.

    I purchased the stove from a gentleman who got it for a hiking vacation to the Isle of Skye. When he returned to the States it got very limited use. I have no idea when it was fired last. Of course, once it was mine, I had to try it.

    After reading the instructions, I emptied the old fuel, rinsed the tank, and filled 1/2 full with fresh K1. I was able to light, but even after 20 min. the flame was quite yellow and no roar. I couldn’t seem to build any pressure. Disassembly revealed trashed leather.

    Broken down it looked like the second photo with pump shaft and large brass nut, leather cup, slotted brass leather holder, spiral “washer”, and small steel nut.

    I had read that the leather assembly should be able to move slightly back and forth to function properly. This one was fixed.
    Is this normal?
    Is there a diagram available showing proper assembly?


    NRV seems to seat when pushed and released.

    Thinking Julian Primus #96 Repair Kit would be step in the right direction.

    Thoughts? FC5DB3D6-FE1F-4D2F-9E7B-B41CF752AF43.jpeg B8EEBD35-3609-41EE-A764-4B9BA2BD56D9.jpeg
     
  2. snwcmpr

    snwcmpr Subscriber

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  3. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Typical pump assembly

    The home made “spring” part in your photo is not part of the pump! Lose it.

    Best Regards,
    Kerophile.
     
  4. E.B.

    E.B. Subscriber

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    Excellent! Thank you for your help.
    I have several stoves that work perfectly well, but this one seems to be taking all my attention.
     
  5. Cookie

    Cookie United States Subscriber

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    As a note..when I recently fettled my 96 I took an undersized bronze shotgun bore cleaning brush wrapped with cotton patches (for firearms) for a tight fit, lubricated with 3-in-1 oil, and scrubbed my tube to make sure that the tube was nice and clean before replacing the leather. My leather gave me a fit going in so I had to reverse it on the rod after lubricating it (to soften it up), insert it just into the tube until it was flush with the end, and let sit overnight so that it would form to the tube. The next day I reversed the leather to the correct position and it went in much easier. It as only after replacing the leather that I was able to discover that the nrv was faulty and was now allowing kero to enter the tube since I was now building pressure. The nrv is a completely different ordeal ](*,)
     
  6. E.B.

    E.B. Subscriber

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    Thanks for sharing, Cookie.
    I had some leather and tried to make a cup, but the creases that formed along the outside edge defeated me. Fortunately, the bore is pristine.
    I have no idea about the NRV, but am making a removal tool just in case.
     
  7. E.B.

    E.B. Subscriber

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    I took snwcmpr’s advice and ordered a kit from The Fettlebox. It came today and I can’t wait to get started.

    Unfortunately, I suffered a fall that resulted in a ruptured quadriceps tendon, so negotiating the stairs to the shop is on hold for the time being. I would probably try it, but my wife has me on a decidedly short leash.

    More to follow...
     
  8. Simes

    Simes Subscriber

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    Ouch, that'll take a while before it's better. Don't rush things, and however frustrating the leash you'll get there.
     
  9. E.B.

    E.B. Subscriber

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    Simes - Thanks for the advice and encouragement.
     
  10. E.B.

    E.B. Subscriber

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    My activity level has been quite low for the last couple weeks due to injury, and I was complaining about it to a friend. I mentioned having a kit to install in my 96, and the next day he showed up with an NRV tool in hand. We replaced everything except the lead tank burner washer, which was in pretty good shape. The NRV had been soaking in Kroil for 2 weeks and came out without issue. We burned the crud off the screen and put things back together.

    It lit up easily, but the flame is somewhat asymmetrical and still tending toward orange. The cleaning needles just fit in the jet. Should I lift the burner bell to see if I can lean out the mixture? Any other suggestions?
     
  11. Simes

    Simes Subscriber

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    Open another beer and post a couple of photos.

    All the major stuff you seem to have sorted, it's a bit of fine tuning.

    If you're not into beer it sounds like it'll brew a cup of tea.
     
  12. E.B.

    E.B. Subscriber

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    Simes, I’m a stout kind of guy, so the “beer” advice works for me.

    The photo is poor because I had to take it in the dark due to the lights in my shop being so bright that the flame was indiscernible. Apparently the tube got dropped at some point because the top has a very minor dent near the orifice which may explain the asymmetry. At least there is no sign of soot anymore.
    Honestly, maybe this is acceptable. Being a Coleman guy who is used to a bright blue flame, I really don’t know what I should expect from my first keto stove.

    FA120E7C-1A95-4EE2-85DE-9D945893E709.jpeg
     
    Last edited by a moderator: Jan 9, 2020
  13. Tony Press

    Tony Press Australia Subscriber

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    1. Don’t force the pricker. If it is “tight” sand it down with very fine emery paper (wet and dry) so that it fits easily; or use a thinner wire.

    2. You could, if game, use a rounded piece of steel tube to panel beat the lipstick from the inside.

    3. With very very fine emery paper (800 or 1000 grit) give the jet a careful light surface clean, then prick again.

    Cheers

    Tony
     
  14. E.B.

    E.B. Subscriber

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    Tony, thanks for the advice. No’s 1 and 3 are a definite. No. 3 kind of makes me nervous...I don’t want ineptitude to ruin what I have gained.
     
  15. Ed Winskill

    Ed Winskill United States Subscriber

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    Use kero rather than fat.....8]

    Classic keroburners burn pure blue when all is as it should be....
     
  16. E.B.

    E.B. Subscriber

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    This forum is the BEST! I have learned so much.
    All kinds of great advice and guidance from some very knowledgeable and generous people.
    Thank you, one and all.
     
  17. Simes

    Simes Subscriber

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    All part of the service @E.B.

    Welcome aboard.
     
  18. Ed Winskill

    Ed Winskill United States Subscriber

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    Stick around...many good things will ensue.
     
  19. E.B.

    E.B. Subscriber

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    Fortunately I have yet to discover pressure lamps...
     
  20. Colin Geer

    Colin Geer Subscriber

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    Make no mistake, it's only a matter of time!!