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Thread: Oil gauge line

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    Senior Member JimTR4's Avatar
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    Oil gauge line

    Hi all,
    At long last I've gotten around to replacing my oil gauge line with a steel braid flexible one from Ted at TS Imports.
    Has anyone fitted one of these?
    I'm still a bit concerned with the supplied adapter which is longer than the equivalent from the old copper line. It means that it doesn't really fit snugly as its slightly longer than the threaded male connector on the gauge itself.
    I spoke to Ted and he says that putting PTFE tape on the gauge connector will make for a good fit. I do also have a leather washer.
    Anyone done this, does it seal perfectly ok?
    (I had a leaky set up before and having fitted a new carpet and dash I don't want a repeat performance!)
    Thanks for your thoughts,
    Last edited by JimTR4; 08-12-2018 at 04:21 PM.
    Jim

    1964 Signal Red TR4

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    Luke Skywalker KVH's Avatar
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    Re: Oil gauge line

    I had a small leak recently, but fortunately that's one of the easiest gauges to get out and back in. I installed a new line from Moss and I seem to recall it didn't take a leather washer. Now I want to check; I have a spare leather washer sitting in a drawer. Did you try your setup yet?

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    Jedi Knight
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    Re: Oil gauge line

    The Moss catalog does list one, 435516, but I'm not sure it was on all the TR4s.
    1960 TR3A TS73117 (under restoration year 6, owned since 1964)
    1959 TR3A TS58023 (in case I never finish the one above)
    1969 Triumph Herald 13/60 (a whim)
    1973 Buick Apollo (was Dad's car)
    1992 BMW325IC (fun to drive)

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    Re: Oil gauge line

    I installed one of these lines and since I didn't read the instructions I assumed that it would have a compression seal like the old plastic line. To my dismay, oil leaked all over the radio. Fortunately I hadn't put the carpets in.
    Teflon tape is the suggested method of sealing the line. I did it and no problems since
    65 TR4A #CT55092

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    Yoda dklawson's Avatar
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    Re: Oil gauge line

    The original Smiths gauge lines used the leather washer with flat-faced fittings. I don't know Ted's kit but other use NPT fittings that do not use a sealing washer. As mentioned above, put a good wrap or two of Teflon tape on the gauge's male threads, then attach the tube fitting. You will be fine.
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

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    Jedi Knight
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    Re: Oil gauge line

    Quote Originally Posted by dklawson View Post
    The original Smiths gauge lines used the leather washer with flat-faced fittings. I don't know Ted's kit but other use NPT fittings that do not use a sealing washer. As mentioned above, put a good wrap or two of Teflon tape on the gauge's male threads, then attach the tube fitting. You will be fine.
    Another possibility is BSPT which will mate nicely with NPT except for a slightly different pitch, causing a leak.
    Tom
    1960 TR3A TS73117 (under restoration year 6, owned since 1964)
    1959 TR3A TS58023 (in case I never finish the one above)
    1969 Triumph Herald 13/60 (a whim)
    1973 Buick Apollo (was Dad's car)
    1992 BMW325IC (fun to drive)

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    Senior Member JimTR4's Avatar
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    Re: Oil gauge line

    Thanks
    Jim

    1964 Signal Red TR4

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    Yoda dklawson's Avatar
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    Re: Oil gauge line

    Quote Originally Posted by TomMull View Post
    Another possibility is BSPT which will mate nicely with NPT except for a slightly different pitch, causing a leak.
    Tom
    You are correct, 1/8 BSPT will easily thread into 1/8 NPT and the thread pitch is only different by one thread per inch so they are close. Though in theory tapered pipe threads should seal without help, they seldom do. I have never seen an installation that hasn't used pipe dope or Teflon tape.
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

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