N14 question

Discussion in 'Ask An Owner Operator' started by BigJoeTX, Feb 13, 2018.

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  1. Feb 13, 2018 #1
    BigJoeTX

    BigJoeTX Bobtail Member

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    Hello fellow drivers my name is Joe and i'm new on here. I have a question for those that are familiar with cummins N14. I bought a truck that has a Cummins N14 celect 460 in it and it uses alot of oil, 4 gallons between oil changes (12k Mi)... I had a detroit 12.7 with 2.3 million miles on it and oil leaks everywhere, that engine used 2.5 gallons of oil between oil changes. This N14 has 727k miles and uses 4 gallons and no leaks anywhere! To me engine sounds good when idling but it's weak on pulls, my brother has the same truck but with small M11 cummins 400hp, and he outpulls me on hills or flat ground. What do you cummins guy's have to say about this? Also truck stalls when i try sliding tandems on my trailer, when i start it back up it throws a real dark cloud of smoke. Thanks in advance.
     
    BigJoeTX, Feb 13, 2018
    BigJoeTX, Feb 13, 2018
    #1
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  3. Feb 13, 2018 #2
    blairandgretchen

    blairandgretchen Road Train Member

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    Sounds like she's ready for an inframe.

    leak points are front accessory drive bushing, and cam followers.

    If it's dry for leaks, then that is some horrendous consumption of oil for that motor, even at those miles.

    What weight oil are you running?
     
    blairandgretchen, Feb 13, 2018
    blairandgretchen, Feb 13, 2018
    #2
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  4. Feb 13, 2018 #4
    BigJoeTX

    BigJoeTX Bobtail Member

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    BigJoeTX, Feb 13, 2018
    BigJoeTX, Feb 13, 2018
    #4
  5. Feb 13, 2018 #4
    BigJoeTX

    BigJoeTX Bobtail Member

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    Thaks for the reply! I'm using 15w40 mobil delvac with lucas. Also my fuel milage won't go past 4.8mpg no matter how i drive.
     
    BigJoeTX, Feb 13, 2018
    BigJoeTX, Feb 13, 2018
    #4
  7. Feb 13, 2018 #5
    m16ty

    m16ty Road Train Member

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    More than likely, a hole in a piston. I had a NHC400 (predecessor to the N14) that had a hole in number 6 piston. Ran fine, other that loss of power, and oil consumption.

    For what it’s worth, a M14 (or any 855cid) is the cheapest truck engine to do a rebuild on.

    No tricks to rebuilding either, except you’ll need a in/lb torque wrench to set the injectors. I’ve rebuilt several myself.
     
    m16ty, Feb 13, 2018
    m16ty, Feb 13, 2018
    #5
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  8. Feb 13, 2018 #6
    mrbamcclain

    mrbamcclain Light Load Member

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    How's your blowby? Could be bad rings. Is it smoking out of the stack?
     
    mrbamcclain, Feb 13, 2018
    mrbamcclain, Feb 13, 2018
    #6
  9. Feb 13, 2018 #7
    mrbamcclain

    mrbamcclain Light Load Member

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    No need for a torque wrench. All you need is a wrench and feeler gauges to run the rack on an N14
     
    mrbamcclain, Feb 13, 2018
    mrbamcclain, Feb 13, 2018
    #7
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  10. Feb 13, 2018 #8
    BigJoeTX

    BigJoeTX Bobtail Member

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    Smoking blue just a little bit at idle, can't see any blow by.
     
    BigJoeTX, Feb 13, 2018
    BigJoeTX, Feb 13, 2018
    #8
  11. Feb 13, 2018 #9
    m16ty

    m16ty Road Train Member

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    IMO, the torque wrench adjustment method is the most accurate way to set the injectors, and is also what is specified in the Cummins manual.
     
    m16ty, Feb 13, 2018
    m16ty, Feb 13, 2018
    #9
  12. Feb 13, 2018 #10
    mrbamcclain

    mrbamcclain Light Load Member

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    The adjustment is actually made by adjusting the screw. A torque wrench can be used to bottom out the injector to clear it of fuel, but that's it's only purpose. Basically to prevent a heavy handed tech from not causing damage trying to over bottom the injector.
     
    mrbamcclain, Feb 13, 2018
    mrbamcclain, Feb 13, 2018
    #10
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