Cummins N14 Oil dripping from blowby tube

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by joey8686, Dec 21, 2018.

  1. joey8686

    joey8686 Light Load Member

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    Cummins N14 celect I have oil dripping from blowby tube but not using much oil or smoking.....anyone have any ideas where to start testing or am I looking at doin an inframe?
     
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  3. Bakerman

    Bakerman Road Train Member

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    What year and how many miles on the engine
     
  4. DieselTech_Aus

    DieselTech_Aus Light Load Member

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    Check the baffle plate behind the Cover the breather tube comes from. Do an oil sample to check for fuel dilution or any indications of excessive blow by.
     
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  5. joey8686

    joey8686 Light Load Member

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    1994 n14 celect mileage unsure cpl 1844
     
  6. Heavyd

    Heavyd Road Train Member

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    Do you have a picture of how bad it is? It is likely normal. They have blow by tubes for a reason. You will get some slobber with any older engine. They will never be perfectly dry. You will get some soot, oil vapours and regular moisture condensation all mixed to look like oil droplets. Oil consumption and low power are indicators of excessive blowby. If you aren't losing oil, I would drive it.
     
  7. joey8686

    joey8686 Light Load Member

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    I’ll try n get a picture, usually it’s just a few drops on the ground if I sit and idle for awhile and sometimes it gets on my passenger step so it’s a little annoying but Truck has good power and decent mpgs for what it is, I fixed all the oil leaks then noticed the drip from the breather, when I change the oil it goes away for a week or 2 til I get more miles on the oil, I checked baffle under valve cover n it’s good,also it’s a Cummins reconditioned crate engine, supposedly has only 3-400000 miles but I never got paperwork on the engine when bought the truck.
     
  8. DieselTech_Aus

    DieselTech_Aus Light Load Member

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    if it breathes then so be it. if its still performs and doesn't consume too much oil just continue operation and attempt to minimize idle time, or set high idle when stationary.

    as for the mess, just extend the breather tube to about 3 inches off the ground. it will help a lot.

    I would do an oil sample to confirm engine serviceability at next service.
     
  9. Heavyd

    Heavyd Road Train Member

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    Yeah, I would just put an extension hose on it too like DieselTech mentioned.
     
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  10. joey8686

    joey8686 Light Load Member

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    All good ideas,thanks everyone,so basically it’s probably not a big deal and get an oil sample tested to confirm nothing major is wrong or fuel dilution happening
     
  11. xsetra

    xsetra Road Train Member

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    Typical oil consumption for my N14 is about a gallon for the first 9,000 miles. When I need a second gallon I change the oil. Usually around 15,000
     
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