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Thread: Fuel Shutoff Valve

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  1. #61
    Jedi Hopeful ckeithjordan's Avatar
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    Re: Fuel Shutoff Valve

    John and Others,

    I still haven't fitted your machined part to the shutoff valve on my car, which is original (it's at the body shop for metal work and a repaint). I did try, however, to fit your part on a valve from Moss. Here's what I found:

    Moss part
    Shaft measures .447 inch
    Cork measures .449 inch
    Chamber measures .493 (I guess this allows for swelling of the cork piece?)

    Your machined part
    Piston .508 inch
    Over O rings .532

    As you can see, your part as machined won't fit the chamber of a Moss part. Just FYI.
    Keith

    1957 TR3 TS20447LO (2017-)
    1962 TR3B TCF1183L (1979-1982)
    1966 Spitfire MKII (1972-1975)

  2. #62
    Yoda CJD's Avatar
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    Re: Fuel Shutoff Valve

    Quote Originally Posted by ckeithjordan View Post
    Cork measures .449 inch
    Chamber measures .493 (I guess this allows for swelling of the cork piece?)
    More the .044" is allowance for ample leakage LOL. Whereas the cork swells when new, after a year it begins to shrink again. Your knowing you have a repro valve may explain the difference in cylinder sizes. I have been told by 2 they fit as I sent, 2 that they needed only some minor opening with a file, and 2, like you, where they aren't even close. I am thinking the repros are the difference.
    John

    1955 TR2

  3. #63
    Jedi Hopeful ckeithjordan's Avatar
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    Re: Fuel Shutoff Valve

    Let me revise some of the numbers on the Moss repro version:

    Cylinder (plunger) .448
    Cork .492-.493
    Inside chamber .491

    Much closer tolerances than I described earlier, but still smaller than machined piece. As I mentioned earlier, I have not measured, nor tried to install in my original-with-car valve, as it is at the body shop. Once I get the car back, I'll take it apart and see.

    I think you're probably right, the repros are different measurements compare to the originals.
    Keith

    1957 TR3 TS20447LO (2017-)
    1962 TR3B TCF1183L (1979-1982)
    1966 Spitfire MKII (1972-1975)

  4. #64
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    Re: Fuel Shutoff Valve

    I must have a repro piece also.
    I think my address is in your message file but PM me if you need it.
    [IMG]file:///C:\Users\Owner\AppData\Local\Temp\msohtmlclip1\01\ clip_image001.jpg[/IMG]
    1962 Triumph TR3B
    TCF2326L
    Jim Martin

    1962 Triumph TR3B
    TCF2326L

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