cummins N14 redhead with low oil preasure

Discussion in 'Trucks [ Eighteen Wheelers ]' started by salidaco, May 16, 2012.

  1. salidaco

    salidaco Bobtail Member

    Messages:
    10
    Thanks Received:
    11
    Joined:
    Jan 24, 2012
    Location:
    salida, co
    Hello, I recentely purchassed a 1999 Volvo with an N14. Since I've owned it the oil preasure only shows 30lbs. Occasionally a engine fluid warning light comes on and cut's out the engine intermitenly. Yesterday It did it 6 times on the way home and on idle the oil preasure was under 10lbs. So obviously it's time to resolve the issue. From Idle, when I give it throttle the preasure goes back up to 30lbs so I'm thinking it's the oil pump. But an oil pump is $700 so I want to make sure that's it and not a sensor or something. The engine has 970,500 on it. Any input would be greatly appreaciated
     
  2. bender

    bender Road Train Member

    Messages:
    2,105
    Thanks Received:
    1,292
    Joined:
    Jul 20, 2010
    Location:
    Don't Kid Yourself
    Check oil pressure with a manual gage at point of sensor. Verify correct idle speed. Replace lube filter. What engine oil are you using and how is the condition of the oil. What is your oil temp gage showing? Coolant temp? If manual gage matches sensor/truck gage values check bearings and oil pump.
     
  3. marmonman

    marmonman Road Train Member

    Messages:
    1,159
    Thanks Received:
    1,891
    Joined:
    Dec 14, 2009
    Location:
    central illinois
    Sounds like it is time for rods and mains at the very least .
     
  4. salidaco

    salidaco Bobtail Member

    Messages:
    10
    Thanks Received:
    11
    Joined:
    Jan 24, 2012
    Location:
    salida, co

    I have been sing Mobile 1 Delo 15 40. I sent an oil sample off and it came back normal. The Temps are also normal. I will start with a manual sensor to see. Thanks for the info:biggrin_255:
     
    bender Thanks this.
  5. bender

    bender Road Train Member

    Messages:
    2,105
    Thanks Received:
    1,292
    Joined:
    Jul 20, 2010
    Location:
    Don't Kid Yourself
    It would also be a good idea verify fault codes to be sure that's what's causing the check lamp and derate.
     
  6. Smellfunny

    Smellfunny Medium Load Member

    Messages:
    484
    Thanks Received:
    120
    Joined:
    Jan 28, 2012
    Location:
    South Carolina
    I agree. If it has not been done it is time for them to be done.
     
  7. rebeloutlaw66

    rebeloutlaw66 Light Load Member

    Messages:
    199
    Thanks Received:
    35
    Joined:
    Sep 2, 2009
    I would also check the cam bearings too
     
  8. osokusmc

    osokusmc Light Load Member

    Messages:
    250
    Thanks Received:
    7,080
    Joined:
    Feb 22, 2011
    Location:
    SD
    Mine was the oil pump. It would alarm at low idle but not high idle and shut down whenever it felt like it. It would flash a shutdown sequence driving, at around thirty psi, but not always shutdown. Time before last was just a sensor.
     
  9. Autocar

    Autocar Road Train Member

    Messages:
    3,167
    Thanks Received:
    2,302
    Joined:
    Apr 28, 2012
    Location:
    The Hot Rod Shop Oxford, AL
    The cam doesn't get close to the wear as the rods and mains do.
     
  10. timc1134

    timc1134 Light Load Member

    Messages:
    106
    Thanks Received:
    26
    Joined:
    Dec 21, 2012
    Location:
    South east, Idaho
    30 psi is not low for a N14 standard is 32 psi@ 1200 rpm with fresh oil above 7 psi at idle and shut down below 3 psi. N14 are low pressure high volume engines. whats the mileage on your engine/ oil pump.