Diesel Exhaust Fluid

Discussion in 'Diesel Additives, Oils, Lubricants, Fuel, etc.' started by stumiister, Jan 8, 2012.

  1. stumiister

    stumiister Diesel Truck Tech

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    Not sure where to put this thread but I had to goon a service call for my company about 1 am this morning, 1 of our new drivers was driving a new Freightliner Cascadia the exhaust sysem requires the DEF fluid so the driver put some in but he mistakenly put it in the fuel now that POS DD15 engine is a real mess.
    So if you know anyone that has a truck that reuires the DEF fluid tell them besure not to mix it in the fuel, it will act like water in the fuel.The engine will not run at all.
     
  2. lbzbuick

    lbzbuick diesel =)

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    DEF is pretty corrosive too i believe. The cummins and volvo DEF problems i have worked on say that do not get DEF on like anything. If it gets in connectors they say to replace them lol. DEF sucks but hey its what gives us mechanics jobs lol.
     
  3. flareside_thun

    flareside_thun I Want Boost!

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    That, and stupid drivers.....makes me wonder if that driver has ever really done a pretrip.
     
  4. OnDaRoad

    OnDaRoad On the road ....

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    Not stupid drivers .....

    Its' not stupid drivers .....

    Its' the layout at the truck fueling stations partly to blame.

    If you have been to a Pilot or Flying J or ..... and fueled
    where the 18 wheelers do - there is bulk DEF fluid
    dispensed out of a nozzle right at the pump island ....

    If you are tired and not paying attention - easy mistake
    to make .....

    A lot harder when you fill using the DEF in the containers



    Jim
     
  5. Matrix37495

    Matrix37495 The Amish Wolfman

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    I hear people say frequently that DEF is corrosive. I thought it was just water and urea, which is fertilizer. Whats so corrosive about it?
     
  6. itsacrazyasian

    itsacrazyasian residentcrazyasian

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    its ammonia.
     
  7. Drew2010

    Drew2010 Full Access Member

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    word on the street is you can run water in the DEF tank and still gain nearly the same and it wont go into limp mode. just dont run it in the cold.... I do not know this for sure, but it is what I have heard on more then one occasion.
     
  8. lbzbuick

    lbzbuick diesel =)

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    no you cant run just water. They have NOX sensors before and after the scr. The def systems are very very sensitive. We work on them alot on semis. Urea is technically a solid. When you add water to it it turns into what you see in the jugs, which is like ammonia. I dont remember all the physics about it but its somthing like that. Just dont put anything in but DEF. It well eventually derate then only let you go 5mph if left like that for too long.
     
  9. vegas39

    vegas39 Full Access Member

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    Stories like this make me proud to own a 26 year old simple vehicle.
     
  10. lbzbuick

    lbzbuick diesel =)

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    like if you spill it, it turns to a crystal looking stuff. Put water on it and it goes away but volvo and cummins say its highly corrosive to certain metals like copper, aluminum, and steel i believe. On semi's anyways the whole systems are plastic, lines and all. The injector looks like stainless steel i think.
     
  11. idi_econoline

    idi_econoline No Bed For Me!

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    From Wikipedia:

    "Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals."

    I've heard at least one nickname, likening DEF to urine. Just sayin'.
     
  12. 1466IH

    1466IH Full Access Member

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    Urea is very corrosive have any of you ever seen a fertilizer spreader? They are almost all stainless and it will even corrode that eventually
     
  13. 79jasper

    79jasper Chickenhawk

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    Urea is also in some foods and beverages.
    Also in a lot of womens makeup.

    Ever seen a girl at an older age that used to dip their face in it vs one that hardly used it, if any at all?
    It's never a pretty site.
     

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