N14 Oil Pressure

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 21blaumeyer, Apr 11, 2024.

  1. 21blaumeyer

    21blaumeyer Bobtail Member

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    Apr 11, 2024
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    Hello everyone. I am a relatively new truck owner. I have owned a 1998 International 9400 for about a year. It has a Cummins N14 tuned to 525 hp. Within the last month or so i have noticed a drop in oil pressure. It normally ran at 35-38 psi at 1500 rpm. And now it’s about 30-33 psi at 1500 rpm. I change oil every 14,000-16,000 miles and send in oil samples. All of the oil samples have come good stating no action is needed. I check oil every morning before start up and during that time smell it and feel it to see if any other fluids are entering the oil. I don’t know how many miles is on this motor, the only number i have sure of is it has at least 300,000 on it. I am wondering if this is something i should be worried about and should be taking actions to figure out? And what could possibly be the cause of this? Thank you!!
     
    blairandgretchen Thanks this.
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  3. xsetra

    xsetra Road Train Member

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    Sounds about the same oil pressure I always had. Only time I got concerned, when psi would go below 5 and the warning light came on.
     
    BoxCarKidd Thanks this.
  4. blairandgretchen

    blairandgretchen Road Train Member

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    Low pressure, high volume - I had a 2000 N14 and had the same worries - it’s fine.
     
  5. Lazer

    Lazer Road Train Member

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    Did your change brands of motor oil, or change type(synthetic, weight, etc.) of motor oil recently?
     
  6. 21blaumeyer

    21blaumeyer Bobtail Member

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    Apr 11, 2024
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    I have run Mobil Delvac Super 1300 15w40 since I have bought it
     
  7. Lazer

    Lazer Road Train Member

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    Ok, we’ll that shouldn’t be the issue. Double check the alternator and make its putting out the correct voltage. Electronic gauges will indicate different readings depending on voltage levels.
     
    BoxCarKidd Thanks this.
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