Cummins N14 Help please

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by fletcherfarmandfleet, Feb 26, 2020.

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  1. Feb 26, 2020 #1
    fletcherfarmandfleet

    fletcherfarmandfleet Bobtail Member

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    We have a 95 pete with an N14. Had a 100% new parts, complete out of frame rebuild last April. Have had some vibrations and random noises lately. There should be no reaaon, less that 250,000 miles on the overhaul. If you keep the speed down at 35 or below it smooths out, feels great, sounds great. At a higher speed with the same RPM's it feels/sounds like it's coming apart. If it is sitting still even at high RPM's it never misses a beat. Any suggestions as to where to start? Thanks for your help!
     
    fletcherfarmandfleet, Feb 26, 2020
    fletcherfarmandfleet, Feb 26, 2020
    #1
    Richierich76 and truckdriver31 Thank this.
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  3. Feb 26, 2020 #2
    DUNE-T

    DUNE-T Road Train Member

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    Injector
     
    DUNE-T, Feb 26, 2020
    DUNE-T, Feb 26, 2020
    #2
    062 Thanks this.
  4. Feb 26, 2020 #3
    fletcherfarmandfleet

    fletcherfarmandfleet Bobtail Member

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    If it was going to misfire wouldn't it miss at any speed/RPM?
     
    fletcherfarmandfleet, Feb 26, 2020
    fletcherfarmandfleet, Feb 26, 2020
    #3
  5. Feb 26, 2020 #4
    tnevin225

    tnevin225 Road Train Member

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    Has the Crank Shaft Dampner been changed
     
    tnevin225, Feb 26, 2020
    tnevin225, Feb 26, 2020
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    jsnell Thanks this.
  7. Feb 26, 2020 #5
    DUNE-T

    DUNE-T Road Train Member

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    Nope, n14 injectors are funny. Sometimes my trucks miss at idle and run fine under load, sometimes it's the other way around.
    When they miss under a load, truck starts shaking badly and it does feel like it's about to fall apart. Check them out and go from there
     
    DUNE-T, Feb 26, 2020
    DUNE-T, Feb 26, 2020
    #5
    jamespmack, spsauerland and blairandgretchen Thank this.
  8. Feb 26, 2020 #6
    fletcherfarmandfleet

    fletcherfarmandfleet Bobtail Member

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    Yes, a shiny new one with the rebuild.
     
    fletcherfarmandfleet, Feb 26, 2020
    fletcherfarmandfleet, Feb 26, 2020
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    jsnell Thanks this.
  9. Feb 26, 2020 #7
    fletcherfarmandfleet

    fletcherfarmandfleet Bobtail Member

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    Ok, thanks
     
    fletcherfarmandfleet, Feb 26, 2020
    fletcherfarmandfleet, Feb 26, 2020
    #7
  10. Feb 26, 2020 #8
    truckdriver31

    truckdriver31 Road Train Member

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    get a run test for each cylinder. was new cam put in it
     
    truckdriver31, Feb 26, 2020
    truckdriver31, Feb 26, 2020
    #8
  11. Feb 26, 2020 #9
    fletcherfarmandfleet

    fletcherfarmandfleet Bobtail Member

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    Yes, new cam with the rebuild.
     
    fletcherfarmandfleet, Feb 26, 2020
    fletcherfarmandfleet, Feb 26, 2020
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    truckdriver31 Thanks this.
  12. Feb 26, 2020 #10
    Bakerman

    Bakerman Road Train Member

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    Had same issue couple months ago, it was the pass through connector.

    $6 part.
     
    Bakerman, Feb 26, 2020
    Bakerman, Feb 26, 2020
    #10
    jamespmack, HopeOverMope, ChevyCam and 3 others Thank this.
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