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    #1

    Temperature gauge

    Hi guys, had a really good run down from Warwickshire to Torquay today.

    For the entire journey the temperature gauge needle sat at the 3/4 mark. Hit some heavy traffic and just touched the bottom of the red marker.

    Car was still running fine, and checked water levels and they were fine.

    Any suggestions?
    Tags: None
    #2
    imported post

    How is your fuel gauge reading? High? If so voltage regulator is shot.

    If not then maybe new sender unit required.

    Nigel
    Mk2 1976 Delft Blue with Beige Interior. TV8 and ZF 4 Speed

    Comment

      #3
      imported post

      Sometimes I have the same problem - like yesterday - but I know what to look for now. In my case it's because the earth lead to the speedometer has dropped off - or the other end of the lead has dropped off.

      So why should this cause the temperature gauge to read high?

      On a Mk2Stag, attached to the speedometer is the voltage regulator. If the voltage regulator isn't earthed (through the speedo) then thetemperature gauge will read high. By the way if this is the reason, then the petrol gauge will also be reading too high. You won't get the one without the other.

      Before youtake the heads off you ought to check this one out.


      Comment

        #4
        imported post

        Thanks guys - That's a relief!

        I thought the fuel gauge was reading correctly, but I will double check tomorrow.

        Really nice run down today, excellent weather with the top down.

        PaulT

        Comment

          #5
          imported post

          I had the same problem on my Stag powered TR coming back from Prescot in that very hot weather so didnt pay much attention, when it did it again a few weeks later on a trip to Cornwall I deciced to hose out the radiator core. Vast quantities of dead flies came out, and on last weeks trip to Devon the temp stayed at about the one third the same as it has done for the last 12 years.

          Try a good squirt with the garden hose first

          Neil
          Neil
          TV8, efi, fast road cams and home built manifolds. 246bhp 220lbft torque

          Comment

            #6
            imported post

            I was having a similar issue with my temp guage. Previous owner said that it always sat at around 3/4 mark. Then, I had a few occasions when it went in to the red in minutes.

            After following the advice on here, I did the easy thing first.... temp sender. That seemed to bring the gauge to just about the 1/2 mark. Things were going well.... until I had the same in to the red problem. Well... the guage was wrong. The engine temp was fine (used an IR thermo)... Then I thought about the regulator, but the fuel gauge was not suffering from the same issue. Then... it dawned on me that both myself and my Dad had seen this before.... knackered battery. Mine was running down in a day or so, and was 6 years old. Changed it, and it's not happened again. I had the same on the Spitfire and also my Dad with his MG. Solved the issue with both of those cars, and seems to have done the same on the Stag

            Jon

            Comment

              #7
              imported post

              jwallbutton wrote:
              I was having a similar issue with my temp guage. Previous owner said that it always sat at around 3/4 mark. Then, I had a few occasions when it went in to the red in minutes.

              After following the advice on here, I did the easy thing first.... temp sender. That seemed to bring the gauge to just about the 1/2 mark. Things were going well.... until I had the same in to the red problem. Well... the guage was wrong. The engine temp was fine (used an IR thermo)... Then I thought about the regulator, but the fuel gauge was not suffering from the same issue. Then... it dawned on me that both myself and my Dad had seen this before.... knackered battery. Mine was running down in a day or so, and was 6 years old. Changed it, and it's not happened again. I had the same on the Spitfire and also my Dad with his MG. Solved the issue with both of those cars, and seems to have done the same on the Stag

              Jon
              Excellent news Jon.

              I will change the ballast resistor this week, then the temp sender if it still does not fix the problem.



              PaulT

              Comment

                #8
                imported post

                Paul,

                The ballast resistor cannot affect temp gauge or fuel gauge readings.

                I hope you mean the voltage stabiliser (to give a stable +10v reagardless of the variable alternator output). The old Lucas electro-mechanical ones aren't much good. I beleve that there are more modern, electronic ones available. Perhaps LD Parts can help.

                Peter

                Comment

                  #9
                  imported post

                  Peter Hills wrote:
                  Paul,

                  The ballast resistor cannot affect temp gauge or fuel gauge readings.

                  I hope you mean the voltage stabiliser (to give a stable +10v reagardless of the variable alternator output). The old Lucas electro-mechanical ones aren't much good. I beleve that there are more modern, electronic ones available. Perhaps LD Parts can help.

                  Peter
                  http://cgi.ebay.co.uk/SOLID-STATE-VO...item1e5d6425dc

                  or

                  http://cgi.ebay.co.uk/Semiconductor-...item4151a3ac47

                  or you could knock one up yourself: http://stagownersclub.mywowbb.com/vi...e%2Bstabiliser

                  Dave
                  Dave
                  1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

                  Comment

                    #10
                    imported post

                    Peter Hills wrote:
                    Paul,

                    The ballast resistor cannot affect temp gauge or fuel gauge readings.

                    I hope you mean the voltage stabiliser (to give a stable +10v reagardless of the variable alternator output). The old Lucas electro-mechanical ones aren't much good. I beleve that there are more modern, electronic ones available. Perhaps LD Parts can help.

                    Peter
                    Hi Peter, thanks for noticing by less than deliberate mistake.

                    I do mean the voltage stabiliser - and yes, LDPart can definately help :-)

                    Comment

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