Oil pressure light

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  • hakim5857
    • Mar 2026
    #1

    Oil pressure light

    Hi, i have an issue with my oil pressure light where the light was on when below than 1500rpm. It never happen before, could the possibility as below;

    A. Oil pressure switch faulty.
    B. Oil pump faulty.
    C. Could be my rpm meter faulty not reading the rpm properly as before the internal spring faulty/snap, modified it & used it back.
    D. or the idiot light become idiot
    Last edited by Guest; 10-20-2012, 08:16 AM.
    Tags: None
    • Nessism
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Mar 2006
      • 35808
      • Torrance, CA
      #2
      The oil pressure switch is a very simple spring loaded plunger; when oil flows out of the pump it pushed the plunger out of the way which disrupts the ground and turns off the light. It's an extremely reliable device so I doubt anything is wrong. Likewise, the oil pump is almost foolproof too. If your bike has an aftermarket oil cooler, the pick-up adapter could be bypassing some flow away from the switch. Not sure what to suggest other than make sure you have a high quality motorcycle or diesel engine oil of the correct weight range.
      Ed

      To measure is to know.

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        Comment

        • hakim5857
          #3
          Originally posted by Nessism
          The oil pressure switch is a very simple spring loaded plunger; when oil flows out of the pump it pushed the plunger out of the way which disrupts the ground and turns off the light. It's an extremely reliable device so I doubt anything is wrong. Likewise, the oil pump is almost foolproof too. If your bike has an aftermarket oil cooler, the pick-up adapter could be bypassing some flow away from the switch. Not sure what to suggest other than make sure you have a high quality motorcycle or diesel engine oil of the correct weight range.
          Thanks Nessism, i didn't install oil cooler. Maybe the diesel engine oil i use like you said, i use 15-40~mobil delvac. I've cross check before use & its similar with shell rotella. I will try another diesel engine oil in next servicing. See how it goes...
          P/S: Shell Rotella not available @ Malaysia but have RimulaX 15-40.
          Last edited by Guest; 10-20-2012, 10:06 AM.

            Comment

            • koolaid_kid
              #4
              The oil you are using is fine. There is something else going on.

                Comment

                • hakim5857
                  #5
                  Originally posted by koolaid_kid
                  The oil you are using is fine. There is something else going on.
                  koolaid_kid ~ I have strong feeling that oil pressure switch &/or the rpm meter fooling me as i tempered it to fix the broken spring. I try to check this two thing first & will post the update.

                    Comment

                    • Redman
                      Forum LongTimer
                      Past Site Supporter
                      Super Site Supporter
                      • Mar 2004
                      • 13762
                      • Michigan, west Michigan
                      #6
                      Originally posted by hakim5857
                      .
                      .
                      C. Could be my rpm meter faulty not reading the rpm properly as before the internal spring faulty/snap, modified it & used it back.
                      .
                      Not understanding your concern about the tachometer relative to the oil pressure light.
                      Even at a very slow idle the oil light should go out. SOmetimes oil light will go out just cranking on the starter motor.
                      Last edited by Redman; 10-20-2012, 03:43 PM.
                      Bikes​
                      Had 650G & 850G. GK since 2005. BOTM 850G 6/2024 , GK 9/2015​

                        Comment

                        • hakim5857
                          #7
                          Originally posted by Redman
                          Not understanding your concern about the tachometer relative to the oil pressure light.
                          Even at a very slow idle the oil light should go out. SOmetimes oil light will go out just cranking on the starter motor.
                          That mean i need to check my oil presure switch, as last time i had play with it by squeeze several time before install it back.

                            Comment

                            • koolaid_kid
                              #8
                              Yes, your spring could be faulty.

                                Comment

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