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Thread: Rocker box support reairs

  1. #1
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
    763

    Default Rocker box support reairs

    Hi. I have a few Knuckleheads that are missing all 3 of the rocker box supports.
    I think there is a manufacturer in Europe and perhaps a source in the US.
    I would like to use cast iron rods with a TIG for the repair, and I have been told that HD used a specific type of cast iron which had some addatives.
    I don't have any experience in repairing Knuckle heads but I have been told the cast iron in the heads can spit some cast welding back at you.
    Does anyone have any experience of fitting either type of repair kits, and was the metal compatible to OEM.
    .
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  2. #2
    Join Date
    Jun 2010
    Posts
    161

  3. #3
    Join Date
    Dec 2001
    Posts
    250

    Default

    I have had good luck with mild steel and brazing for adding missing pieces for barrels and heads on knuckleheads. No failures to date over fifty years.
    DrSprocket

  4. #4
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,135

    Default

    Dr. Sprocket!

    If you can stick mild steel straight to cast iron, yer a better man than I, (insert "Gunga Din"....)!

    ....Cotten
    Last edited by T. Cotten; 03-20-2017 at 01:32 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  5. #5
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
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    Default

    Hi 1950Panhead, Richo and Cotten.
    Thanks for the info and link.
    I would like to try and use a cast iron repair piece and use cast iron rods if possible.
    If all else fails, I will revert to brazing the steel parts on.
    I will keep researching.
    Regards Steve
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  6. #6
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,135

    Default

    Steve!

    I had my best luck with splicing on a piece with a low-temp silver-solder, as it reduced the "chill" hardening upon the cast iron.
    Even brass brazing seemed to suffer hardening. My TIGmeister's silicon bronze work turned the casting extremely hard and un-friendly.

    When very little machining after the repair was needed, such as only carving a fin, I have had great luck using air compressor piston rings for filler rod, and my Henrob torch.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  7. #7
    Join Date
    Dec 2001
    Posts
    250

    Default

    Steve, I V both pieces to get 100% penetration, pre-heat and let cool under an asbestos blanket. I've never had a hardening problem. Some people save old broken cast iron fins but mild steel works fine. My friend George Hood an engine builder of some renown uses a mig with steel wire for mild steel to cast iron with fine results but I don't have the guts to try. Some folks use ni-rod but I never liked the results. I know that old Yale cylinders are made of really trashy cast iron and really hard to get good results. Old cast iron exhaust manifolds with lead contamination are like old aluminum cases with oil contamination and hard to get clean to get good results. A lot of my repairs on early pre-sixteen cylinders have been nickeled with good results. Later ones are usually painted. Of course the repairs are textured to simulate cast iron. Good luck Steve. More than one way to skin a cat Cotton and as far as a better man let's just leave it as different.
    DrSprocket

  8. #8
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
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    Default

    Got some good points out of both those ideas. Thanks.

    When we were kids the old man would insist on packing 9 of us (It was a Brady Bunch situation) in a Ford station wagon and go for a drive on the weekends. It was the 60's, so kids were laying down in the back as well. Both folks were puffing away on fags and it was always confined and every one had an opinion, which sometimes got testy.
    On these frequent occasions, the old man would raise his hand in the air and yell “Don't make me come back there!!
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  9. #9
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,135

    Default

    It would seem Folks,

    That I cannot even compliment someone without ruffling feathers.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  10. #10
    Join Date
    Jan 2002
    Location
    South Dakota
    Posts
    193

    Default

    "
    We have the cast iron diving boards in stock now.
    Carl

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