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N-14 in 98 Int 9400

Discussion in 'International Forum' started by russmustar, Nov 1, 2014.

  1. Nov 1, 2014 #1
    russmustar

    russmustar Bobtail Member

    12
    3
    Oct 29, 2013
    Bay City. MI
    0
    Hello-I'm a company driver running a 98 Int 9400 w/N-14 Cummins. After taking truck to shop for DOT insp and PM, I've had it back 4 times because it seems to crank forever before it fires up as if it's losing prime. It wasn't that way before it was worked on and they have changed 2 "check valves" with no success. There are 2 fuel filters in system, one on the engine itself and one remote on firewall. I'm thinking system needs "burping" for lack of a better word. The shop doing the work(national chain) specializes in Detroits, and they do all our company service, but they seem lost when it comes to Cummins. Any advice would be greatly appreciated. THX-Russ
     
    russmustar, Nov 1, 2014
    russmustar, Nov 1, 2014
    #1
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  3. Nov 1, 2014 #2
    315wheelbase

    315wheelbase Heavy Load Member

    783
    600
    Oct 26, 2014
    0
    check fuel pressure .,fuel filters .N14 are great engines
     
    315wheelbase, Nov 1, 2014
    315wheelbase, Nov 1, 2014
    #2
  4. Nov 1, 2014 #3
    dustinbrock

    dustinbrock Road Train Member

    1,306
    900
    Apr 19, 2012
    saskatoon,sk
    0
    Are you having any issue with your fuel tanks leveling out? My n14 had long cranking and it was a plugged fuel tank vent line. Fuel tanks had vacuum so it was hard for the fuel pump to suck fuel.

    But on my volvo I had long cranking before start and it was the injector cups.
     
    dustinbrock, Nov 1, 2014
    dustinbrock, Nov 1, 2014
    #3
  5. Nov 2, 2014 #4
    xsetra

    xsetra Road Train Member

    4,928
    6,587
    Aug 21, 2011
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    Did the cranking time change after the fuel filter was changed. Check the o-ring on the fuel filter. Another place to look for an air leak is the cooling plate behind the ECM.
     
    xsetra, Nov 2, 2014
    xsetra, Nov 2, 2014
    #4
  7. Nov 2, 2014 #5
    062

    062 Road Train Member

    5,852
    31,732
    Oct 20, 2013
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    Are you getting any white smoke or stumble when it fires up?
     
    062, Nov 2, 2014
    062, Nov 2, 2014
    #5
  8. Nov 2, 2014 #6
    russmustar

    russmustar Bobtail Member

    12
    3
    Oct 29, 2013
    Bay City. MI
    0
    No smoke or stumble, power is great considering engine has over 1.25 million on it w/no oil consumption. Mileage seems to be down slightly, I gotta beleive it's the filters, but these mechanics don't seem to listen. The sad thing is that they screwed it up, but company is paying for all the repairs they do and don't cure the issue. THX for the advice. Russ
     
    russmustar, Nov 2, 2014
    russmustar, Nov 2, 2014
    #6
  9. Nov 2, 2014 #7
    062

    062 Road Train Member

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    Oct 20, 2013
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    What brand & part # are filters? N-14 generally use 10 micron filter
     
    062, Nov 2, 2014
    062, Nov 2, 2014
    #7
  10. Nov 3, 2014 #8
    russmustar

    russmustar Bobtail Member

    12
    3
    Oct 29, 2013
    Bay City. MI
    0
    Finally convinced maintenance director to have filters changed and we will try that. THX for all the good advice, will keep you updated. THX again-Russ
     
    russmustar, Nov 3, 2014
    russmustar, Nov 3, 2014
    #8
  11. Nov 3, 2014 #9
    Turtles

    Turtles Light Load Member

    64
    49
    Jun 10, 2011
    0
    Did they remember to fill the filters before installing them? It's not necessary on an old Detroit but a N14 won't fill the filter while you are driving it.

    Pull the filters and see if they are full of fuel. And check the filter seal. If the seal was stuck to the filter seat instead of the filter when you put the new filter on you will often get enough of an air leak to almost lose prime.

    If the filter is empty and it was full when installed the problem is from filter to the tank.

    Check your tanks, when you open the filler cap to fuel do you get a vacuum seal effect? You shouldn't so check the tank vents on both sides. The pump isn't strong enough to pull through the vacuum.

    Check the pump. And go on a hunt for air leaks. The O ring on the back of the fuel pump is known for leaking air just before it starts leaking fuel. It's a penny part but a pain to change.

    And the ugly... Are the fuel lines the original rubberized ones? They degrade with time and swell and become soft. They will swell enough the the fuel pump won't be able to pump enough fuel. And touching one is enough to start a leak.

    Has anyone gutted a filter lately? A clogged filter will give you the same systems even before the engine loses power from being starved for fuel. Are they catching water, algae or unidentified black crud? Where do you fuel? Have you fueled during or shortly after a fuel dump?
     
    Turtles, Nov 3, 2014
    Turtles, Nov 3, 2014
    #9
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