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    Oil Pressure Gauge problem?

    Hi Folks. I have just picked up my 1974 Stag and driven it the 150 miles home. The 0il pressure cold at tick over was 25psi. During the 3 hr drive home I noticed that the pressure stayed on 25 psi even at 70 mph. ( Rev counter is not working) When arriving home pressure was 20 psi tick over, after revving up to 25psi.
    Does the gauge have a problem? Regards. Dave

    #2
    is it dropping to zero on shut down?
    how long is it taking to register on start up? could be pressure relief valve spring

    Comment


      #3
      DMT.
      I think there may be a problem with the gauge. If the relief valve spring has failed, the pressure at tick over would be almost nothing. If the relief valve is sticking, the pressure would go well above 25 psi. The 20 psi hot at tick over sounds good, so I reckon the gauge sticks above 25 psi.
      Mike.

      Comment


        #4
        At the risk of teaching granny to suck eggs, I'd try tapping the gauge firmly when the engine's at normal driving revs. In the past I've had cars with sticking mechanical gauges that responded to that and worked fine, once the stuck needle was freed.

        Best wishes
        Anthony
        1976 Carmine red stag &1961 Austin Healey 3000 MkII

        Comment


          #5
          When I changed the bulb in my pressure gauge, the connector went too far into the gauge and the bulb fouled the gauge mechanism. I didn't realise this until I found the pressure would not show above 20psig.
          Just a thought! Pulling the connector out solved the problem!
          Chris

          Comment


            #6
            I had the same problem as Chris, above. Eased the bulb holder out and pressure reading returned! Regards, John.

            Comment


              #7
              Problem sorted.

              I am an ex MGB owner and assumed the pressure gauge was mechanical.

              I have also a problem with the rev counter, only going up to 1000 rpm at 70!

              Checked under the bonnet today and found the earth stud on the passenger side lower engine bay side has a stripped nut and the wires were very loose.

              Tightened them up and all works fine!!

              I now have to find out where the engine dip stick is!

              Thanks for the help.

              Much appreciated.

              David

              Comment


                #8
                Originally posted by DMT View Post

                I now have to find out where the engine dip stick is!
                Hello David,

                Assuming you mean its location, it lives next to cylinder 5, which is something else the MGB doesn't have!

                Dave

                IMG_1162.HEIC

                Comment


                  #9
                  Ha Dave. Mine had 8. P6 block, 4 barrel Edelbrock, LT77 box with LSD. Drove like a Pig on steroids.

                  Just found the stick. Thanks.

                  Regards

                  Dave

                  Comment


                    #10

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