Handy Taps And Dies To Have On Hand

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  • Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4104
    Topics: 420
    #178657

    Here’s some common and not so common taps and dyes I keep nearby when working on the smaller OMC classics. While everything is apart, I like to chase all of the threads to remove any gunk or corrosion. That makes it a whole lot easier when going back together. The 4-40 is used for carb butterfly screws while the common 10-24 is used mostly for exhaust covers, intake manifolds, and mag plates. The 6-32 will clean up the threads on the mags adjusting screw for the points. The special order oddball 12-28 is used for the tiller grip screw and 1/4-40 is used for most carburetor mixture adjusting screws. The 12-28 comes in real handy as lots of tillers I see have mangled threads in them.

    • This topic was modified 1 week, 1 day ago by Mumbles Mumbles.
    • This topic was modified 1 week, 1 day ago by Mumbles Mumbles.
    • This topic was modified 1 week, 1 day ago by Mumbles Mumbles.
    • This topic was modified 1 week ago by Mumbles Mumbles.
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    Randy in Tampa
    Randy in Tampa
    US Member - 1 Year
    Replies: 141
    Topics: 16
    #178668

    I use many of the same ones on the older Johnson motors “square tankers” Thanks for sharing Mumbles

    Rotary valve Johnson’s Rule!

    Buccaneer
    Buccaneer
    US Member - 1 Year
    Replies: 3003
    Topics: 838
    #178671

    Pretty sure I don’t have a 12-28 tap or die….. mine probably get
    retapped a different size without me knowing about it!

    Prepare to be boarded!

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    rmhxruss

    Replies: 103
    Topics: 4
    #178677

    Some OMC carb butterfly screws are 5/40 thread. A not so common size.

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #178682

    Mumbles – you are so right regarding having all of these taps and dies. I recently had to go pick up a 4-40 to clean up one of the carb butterfly screw holes when I rebuilt my RD-18 carb. I needed the 12-28 tap on another rebuild and although I didn’t have one, I was able to borrow one from a neighbor who was a machinist. Always good practice to clean up threads during the rebuild process.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19

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    amuller
    US Member - 2 Years
    Replies: 845
    Topics: 134
    #178683

    Thanks! Suggestions on a good source to order from?

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    fleetwin
    US Member - 2 Years
    Replies: 2659
    Topics: 32
    #178684

    Great advice, will have to find the 12-28 and 1/4-40 ones for sure…

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    Geer Pyron
    US Member - 1 Year
    Replies: 19
    Topics: 4
    #178687

    Living in a small town I have a problem finding certain tools. Tried to going to the local machine shop, but they just grunted at me.
    I mostly have to order them from the innerweb.
    My go to is Mcmaster-Carr.
    They have everything we need.
    If you don’t mind shopping online.
    g

    JMGP

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4104
    Topics: 420
    #178689

    I’m in Victoria and no one here could supply me with them so I had to mail order them from a tool supply house in Vancouver. !/4 – 20 left hand thread for an ongoing project are next.

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