Oil pressure or sensor? | FerrariChat

Oil pressure or sensor?

Discussion in 'Boxers/TR/M' started by testajohn, Apr 23, 2017.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    After 20 minutes of driving my 84 TR the oil pressure gauge shows hardly any pressure and on low revs a sound signal appears shortly and the red light turns on. Just for half a second.
    My Ferrari shop replaced the sensor last month. Is this a known problem? Could it be just the sensor? Should I worry?


    Verzonden vanaf mijn iPhone met Tapatalk
     
  2. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,867
    southwest germany and thailand
    Full Name:
    romano schwabel
    would be great if you could also fill out your profile beside your first post where you introduced yourself a little
    this will help you and also the community here
    thank you
     
  3. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland


    I'll do


    Verzonden vanaf mijn iPhone met Tapatalk
     
  4. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    5,246
    Madison Ohio
    Full Name:
    David A.
    Hook up a temporary mechanical gauge to verify!
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,040
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    No, that has not been a commonly reported problem here, and there are two separate sensors -- one for the pressure gauge and one for the red light/buzzer (so not likely that they both failed at the exact same time, and more likely that the oil pressure was actually low).

    Is this a repeatable problem? -- Always OK for first twenty minutes and then the same symptom always appears? Or was it a one time occurrence, and now doesn't happen at all?

    One other simple thing to do (like replacing the sensor) is to replace the oil filter as the filter element inside can collapse and block the flow. Did your Shop also replace the oil filter?
     
  6. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    Your analysis makes a lot of sense.
    It is repeatable, it happens every time.
    The oil filter has been replaced.



    Verzonden vanaf mijn iPad met Tapatalk
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,040
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #7 Steve Magnusson, Apr 23, 2017
    Last edited: Apr 23, 2017
    Ack! - not good. The only other thing that I can think of that would cause such repeatable bad behavior is if the plunger in the oil pressure relief valve is stuck in the more open "cold" position. The way it should work is: when cold (when the oil has a higher viscosity) the plunger get forced to the more open position (opening the bypass port) to limit the oil pressure. Then, as the oil warms, and thins, the plunger moves back to close off the bypass port and maintain the oil pressure. If the plunger is stuck in the more open cold position, the symptom would be that the oil pressure on the gauge (for the same engine RPM - like idle) would just slowly decline as the oil temperature increases -- is that what's happening?

    Please do let us know how it works out as this hasn't been a commonly reported problem -- so we'd like to know the cause/solution.
     
  8. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    Hmm. Oil temp is not rising... Sound is not firm, but very irregular and only with stationary revs. Adding a tiny little gas makes it go away. But pressure stays low.
    I'll take it out for a ride later this week and write down precisely what happens and in which order. I 'll also ask the shop mechanic.


    Verzonden vanaf mijn iPhone met Tapatalk
     
  9. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,867
    southwest germany and thailand
    Full Name:
    romano schwabel
    best would be to test the pressure with a hydraulic gauge to elimanate electric gremlins and then see what will happen.
     
  10. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    It was tested with external oil pressure. Pressure was good. It is a little low on Rev when stationary, so I am turning it up a little and add 10w60 oil instead of 5w40


    Verzonden vanaf mijn iPhone met Tapatalk
     
  11. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,867
    southwest germany and thailand
    Full Name:
    romano schwabel
    how many bar/psi at what rpm?
    cold or warm?

    what you understand under stationary? what is low? numbers please to see what is going on.
     
  12. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    Romano is asking some good questions. I would hate to see you hurt it by applying a band aid if there is something wrong that can still be fixed. Going to w60 oil should not be needed if the pressure is good.
     
  13. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    I didn't do it myself. It was done by the Ferrari shop. So I have no actual number. I will however drive by them and see what has been logged.
    Stationary is Dunglish. Sorry.. I meant when running idle.


    Verzonden vanaf mijn iPhone met Tapatalk
     
  14. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,867
    southwest germany and thailand
    Full Name:
    romano schwabel
    dunglish - dutch-english? WOW new word creation :)

    in cold idle the oilpressure has be to be more than 1 bar at 900 rpm, better would be 1,5 bar
    in warm ( so oil temperature above 70 °C ) minimum 0,6 at 900 rpm, but at 1200 just 1 bar and more
     
  15. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    5,246
    Madison Ohio
    Full Name:
    David A.
    Idle, stationary, tick over.
     
  16. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    With 40w oil, not 60.

    And it should go up to 4.5-6 bars at high RPM hot.
     
  17. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
    Owner Rossa Subscribed

    May 4, 2001
    35,287
    Birmingham, AL
    Full Name:
    Tommy
    Now that we are a couple of years out with that digital oil psi upgrade modification that is available to us by a member here, are you still happy with its performance? Would that be an option for John's TR (or was it set up for only the V8?)?

    I have not installed mine yet, it is still sitting in a box in the trunk. It will be a summer project this year.
     
  18. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    Fits TR too. Our TR still has it's original and it works well so I have no need in it. It is the replacement senders which were such a problem. In the 328 still very happy. Have installed a few. No complaints.
     
  19. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    You won't believe this. The car was serviced by an official Ferrari shop. Costed 7000 euro. They replaced the sensor, so I guessed that wasn't causing the problem. Therefor I asked you here. But then I thought why is it OK when it starts? So I checked the oil level....[​IMG]


    Verzonden vanaf mijn iPhone met Tapatalk
     
  20. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,040
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Agree that that's not a good result from a professional workshop, but are you saying that adding a little engine oil resolved the pressure problem? Wouldn't have thought that being 1~1.5 liter below minimum would have any effect at all on the oil pressure for rational street driving.
     
  21. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    5,246
    Madison Ohio
    Full Name:
    David A.
    TR oil level should be checked after a run! If the car sits the level can drop!
     
  22. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    Agree in every way. Out of 14 quarts total capacity 1 or 2 will not effect oil pressure.
     
  23. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    You are trying to find an outcome you like. You need to find the truth and that isn't it.
     
  24. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,867
    southwest germany and thailand
    Full Name:
    romano schwabel
    this is only about 2 ltr oil missing
    so that never could be the pressure problem
    how do you checked the oil level? normaly engine has to run and then check - it is a dry sump system
    when the engine stands overnight on the stick there is no oil to see
     
  25. testajohn

    testajohn Rookie

    Dec 19, 2016
    17
    Harmelen,Netherlands
    Full Name:
    John Hoogland
    Thanks. I think both of you are right.


    Verzonden vanaf mijn iPhone met Tapatalk
     

Share This Page