Petromax 850 inner Jacket rebuild

Discussion in 'Fettling Forum' started by Dieselross, Jun 20, 2021.

  1. Dieselross

    Dieselross Germany Subscriber

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    Moin,
    today I had the opportunity to bring my Petromax 850 back to life.
    The lamp came to me a few weeks ago and is basically in good condition.
    IMG_20210511_195432.jpg

    The restoration was almost limited to cleaning, cleaning and a proper assembly.

    IMG-20210514-WA0013.jpg IMG-20210514-WA0011.jpg

    Whatever the reason, the entire inner jacket, including all built-in parts, was missing.
    IMG_20210511_195438.jpg

    There is nothing to buy, but a dimensioned drawing can be found on the internet.
    So a replica came into consideration. When a 250 Petromax was visiting recently, I put on the inner jacket and found that it seemed convertible with a feasible effort.
    IMG-20210512-WA0041.jpg

    A used complete coat was found in the classifieds.

    The necessary changes were essentially limited to reducing the outside diameter, attaching a new collar and shortening the mixing tube a little and inserting it deeper.
    IMG_20210522_105939.jpg IMG_20210522_110656.jpg IMG_20210522_111619.jpg IMG_20210522_182124_609.jpg

    I have now inserted a guide sleeve into the inner jacket.
    IMG_20210619_155442_924.jpg IMG_20210619_155438_423.jpg IMG_20210619_155458_212.jpg
    This reduces the passage from the carburetor into the jacket somewhat, making it "denser".
    IMG_20210619_161732_339.jpg

    The original jacket also has such a bushing, which, as I understand it, also serves to prevent the hot exhaust gases from being drawn up along the nozzle and entering the mixing tube.
    This gives the possibility for the hot gases to flow in, also about 10 mm lower, the "fresh air space" to the nozzle and mixing tube is no longer "polluted" by hot exhaust gas.



    The first attempt to start was immediately successful and the lamp burns with the settings, free to the nose, clean and stable!

    IMG_20210619_155937_506.jpg IMG_20210619_155941_168.jpg IMG_20210522_154625.jpg IMG_20210522_181635_738.jpg


    I hope the Google translator and follow-up service translated my text in a way that was understandable and I found the right category here.

    best regards, Torsten
     

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  2. John

    John United States Subscriber

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    Fantastic work. You saved this for years to come.Your skill with working with thin material is to be commended.
     
  3. MYN

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    Excellent work. Its always interesting to fabricate or improvise in order to make up for the missing pieces.
     
  4. Fireexit1

    Fireexit1 United Kingdom Subscriber

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    A very good fettle. Great to see such a lantern working again :thumbup:
     
  5. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Great fettling and well saved!:thumbup::thumbup:
     
  6. ROBBO55

    ROBBO55 Subscriber

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    Nice work! :clap::clap::clap:
     
  7. AussiePete

    AussiePete Australia Subscriber

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    Nice remedial work, well done. She now runs a treat.
    Enjoy
    Pete
     
  8. Steven67

    Steven67 Germany Subscriber

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    Well done!
     

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