cummins N14 redhead with low oil preasure

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

  1. salidaco

    salidaco Bobtail Member

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    Jan 24, 2012
    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

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    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

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    central illinois
    Sounds like it is time for rods and mains at the very least .
     
  4. salidaco

    salidaco Bobtail Member

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    Jan 24, 2012
    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

    2,105
    1,300
    Jul 20, 2010
    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 Heavy Load Member

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    Jan 28, 2012
    South Carolina
    I agree. If it has not been done it is time for them to be done.
     
  7. rebeloutlaw66

    rebeloutlaw66 Light Load Member

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    Sep 2, 2009
    I would also check the cam bearings too
     
  8. osokusmc

    osokusmc Light Load Member

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    Feb 22, 2011
    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

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    Apr 28, 2012
    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

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    Dec 21, 2012
    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.
     
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