Results 1 to 4 of 4

Thread: Meaning of the ‘dots’ under the temperature scale?

Forum to discuss Austin Healey Sports Cars

  1. #1
    Jedi Trainee
    Join Date
    Apr 2013
    Location
    Oakville, Canada
    Posts
    207
    Thanks Thanks Given 
    11
    Thanks Thanks Received 
    2
    Thanked in
    2 Posts

    Question Meaning of the ‘dots’ under the temperature scale?

    Does anyone know the meaning of the 4 ‘dots’ on the temperature scale at 130, 140 and just below and above 212F ?
    Attached Images Attached Images

  2. #2
    Obi Wan RAC68's Avatar
    Join Date
    May 2010
    Location
    NJ Shore
    Posts
    2,097
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    18
    Thanked in
    17 Posts

    Re: Meaning of the ‘dots’ under the temperature scale?

    Hi Steve,

    Its only a guess but I would suggest it indicates the effective range of the gauge/sender...the effective operating temperature.

    Ray(64BJ8P1)

  3. #3
    Yoda dklawson's Avatar
    Join Date
    Mar 2005
    Location
    Durham, North Carolina, USA
    Posts
    6,180
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    44
    Thanked in
    41 Posts

    Re: Meaning of the ‘dots’ under the temperature scale?

    On the electric gauges the dots represent calibration points (primarily used by the factory). I assume the same applies to the mechanical gauges but I have no information to support that claim.
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

  4. #4
    Jedi Warrior BJ8Healeys's Avatar
    Join Date
    Dec 2001
    Location
    Havelock, NC USA
    Posts
    679
    Thanks Thanks Given 
    2
    Thanks Thanks Received 
    24
    Thanked in
    16 Posts

    Re: Meaning of the ‘dots’ under the temperature scale?

    I agree that the dots are calibration points. The two at 212 are obvious: 212 is the boiling point temperature of water at sea level and is a constant known temperature quantity and therefore suitable as a calibration point. I don't have a clue what the two dots at 130/140 calibrate for but it seems desirable to calibrate a gauge at a high and low temperature rather than just one location. I used the two at 212 to re-calibrate my gauge when I suspected that it was reading too high and contributing to my engine "overheating" problem. With the sensor immersed in boiling water, I found that the gauge read significantly above the 212 mark (I live at sea level, by the way). With the sensor still immersed, I removed the gauge needle and replaced it exactly between the two dots. My gauge now runs where it should, and with the engine dead cold the needle sits at the peg at 90 F.
    Steve Byers
    HBJ8L/36666
    BJ8 Registry
    Havelock, NC

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •