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  1. #1
    Join Date
    Dec 2007
    Location
    cheshire
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    1,402

    Mechanical oil pressure gauge

    Hi does anyone know what size the big brass nut that goes over the bulb at the end of the capillary tube please??
    Thanks
    Lee
    .............never drive faster than your guardian angel.

    cobraclub.com/gallery/showgallery.php/cat/633 - this is the link to my build photo's you have to put w w w . h t t p : / / in front of it!!

  2. #2
    Join Date
    Mar 2007
    Location
    Maldon Essex
    Posts
    506
    5/8 UNF if we are talking about smiths gauges.

  3. #3
    Join Date
    Mar 2007
    Location
    Maldon Essex
    Posts
    506
    Just to check, you have written pressure gauge but I assume you meant temp? There is no bulb on the end of the pressure gauge tube. The size I have given you is for the temp gauge bulb

  4. #4
    Join Date
    Dec 2007
    Location
    cheshire
    Posts
    1,402
    Yes you're right, definitely the oil temp, it's the full sweep cobra oil temp gauge.the capillary and bulb are the same as the water temp.
    Thanks,
    Lee
    .............never drive faster than your guardian angel.

    cobraclub.com/gallery/showgallery.php/cat/633 - this is the link to my build photo's you have to put w w w . h t t p : / / in front of it!!

  5. #5
    Join Date
    Mar 2007
    Location
    Maldon Essex
    Posts
    506
    Yes, water and oil temp are both 5/8 UNF.

  6. #6
    Join Date
    May 2003
    Location
    Hampshire
    Posts
    159

    extract from merlin motorsport advert for a smiths mech temp gauge

    ‘Smiths Classic Mechanical Water Temperature Gauge. Reads from 30-110°C with 270° needle sweep. 52mm body diameter and comes with 6ft 6inch capillary tube with 3/8BSP female threaded bulb on the end, an adaptor is then fitted to go to 5/8UNF thread.”

    The captive female nut on the capillary tube looks to be a 3/8 bsp, and it comes with a 5/8 unf adapter, which might need changing if what ever you are attaching to isn’t a 5/8.

    4B2756F7-EF3B-4D4C-A466-918170FFFCCF.jpeg

    hopefully the photo works
    Roger

    RamSC 351 Cleveland

    on the road 20 years- nearly finished

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