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  1. #16
    Join Date
    Dec 2007
    Location
    Melbourne
    Posts
    1,628

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    Hi Greg,

    I'm pretty shattered about knocking it off the bench an busting it. If you think you can fix it for me I'd be indebted to you. How does the Baffle actually work, it it just to stop water boiling and splashing out of the hopper?

    Would you happen to know what thread is in the brass fuel needle and fuel uptake? I'd like to run a tap through before putting them back.
    …..Live a Quiet Life & Work with your Hands

  2. #17
    Join Date
    Mar 2009
    Location
    Melbourne
    Age
    54
    Posts
    825

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    G'day Dale,
    Don't be too hard on yourself, you haven't really worked on old machinery until you've broken or damaged an irreplaceable part.
    The baffle's primary purpose is to prevent a sudden drop in temperature when you add cold water to the hopper to replace that lost through evaporation.
    Cooling in these engines works on a thermosiphon principal. The hot water from the head expands through the upper port into the top of the hopper, this draws water into the head from the bottom of the hopper through the lower port. The water in the hopper is hotter at the top and sinks to the bottom as it cools and the cycle repeats.
    If you pour a bucket of cold water into the hopper it will immediately sink to the bottom because it's more dense than the hot water. This cold water will then get drawn into the head rapidly cooling it which is not ideal, particularly for a kero engine. The pot shape of the baffle with a hole in the bottom allows the cold water to mix gradually thus reducing the drop in temperature. As you said, it also helps reduce the amount of water sloshing out the top.

    Sorry I've got no idea what thread is on the needle or pickup tube, if I had to guess I'd say 3/8 Brass (BSB) but that would just be wild speculation. Unless the thread is damaged I wouldn't bother, just use a good non hardening sealant (Permatex Aviation Form-A-Gasket Sealant Liquid - No. 3, 59mL - Supercheap Auto) on the pickup tube and you should be right.

    Give us a yell when you can drop off the busted baffle, you can bring it to me at work in Rowville if that's any easier.
    Cheers,
    Greg.

  3. #18
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

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    Quote Originally Posted by DSEL74 View Post
    Hi Greg,

    I'm pretty shattered about knocking it off the bench an busting it.
    That is a POP fix (piece of )

    Either braze it or high nickel content cast iron stick rods. So simple I could do it upside down while blindfolded with both hands tied behind my back. Well, maybe not quite like that .

    If you stick weld it, preheat it first.
    Gold, the colour of choice for the discerning person.

  4. #19
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

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    One thing I didn't see mentioned, was that DON'T wrap the hand and thumb around the handle, unless you'd like a broken thumb. Something I got told when I was about 17.
    Kryn
    To grow old is mandatory, growing up is optional.

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