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Old 05-10-2015, 01:04 PM   #11
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I have not had issues at all with the DEF, I only notice the regen when the truck is at idle and it will be 200 or so rpms higher.Most of our daily driving is short trips.I get a message in the DIC when I have 1000 miles to empty on the DEF so running low and going into limp mode is really not a issue.
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Old 05-10-2015, 01:54 PM   #12
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So traveling on the highway for hours I am not faced with a regeneration? Regeneration just happens when it is needed and I don't need to do anything but keep DEF in the tank. I thought will traveling I might get a regen request buy the symbol coming up on the dash.
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Old 05-10-2015, 02:10 PM   #13
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As the DEF system is part of the mandated emissions control it is all automatic as to operating at the correct time(s). You will not even be aware of when it is operating.

The DEF Diesel Exhaust Fluid system is separate from the DPF Diesel Particulate Filter. The DEF is injected/metered. The DPF gets regeneration cycles. Both are automatic.

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Originally Posted by BlueTec
BlueTec® SCR Emissions Technology
BlueTec is a complete emissions system that combines exhaust gas recirculation (EGR), selective catalytic reduction (SCR), diesel oxidation catalyst (DOC) and the diesel particulate filter (DPF) to efficiently meet the EPA 2010 emissions standards. BlueTec treats the exhaust gases downstream of the engine instead of requiring complex changes under the hood. It does this by injecting a small amount of diesel exhaust fluid (DEF) into the exhaust stream. DEF reacts with the NOx in the SCR catalyst to form nitrogen and water. Then, the nitrogen and water, safe elements in the air we breathe, are released into the environment.
https://www.demanddetroit.com/perfor...emissions.aspx

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Originally Posted by richard66 View Post
...I thought while traveling I might get a regen request buy the symbol coming up on the dash.
The only operator response necessary is to fill the DEF tank when you get a low DEF indicator on the dash. Should the system fail that will also generate a dash warning. Other than that it should just cruise along.

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Old 05-10-2015, 07:25 PM   #14
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Thanks for all the great information.
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Old 05-10-2015, 08:48 PM   #15
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Since I teach this topic to dealer techs for my employer, let me give a quick clarification.

DEF has a definite shelf life and you would be wise to carry your own, but don't buy huge quantities so you have quality DEF to use. Be careful with it and store it in plastic containers with tight fitting, leak-proof lids. It will quickly corrode any metal it comes in contact with. There are kits to test the DEF quality, but I'm sure you don't want to do that at a fuel station. The advice was good when you were told the DEF at a fuel station is questionable - unless you are familiar with their practices. Fill your DEF tank when it gets low so that the DEF doesn't sit in the tank too long. But don't let it run out. Your engine performance will be derated, and eventually won't be able to be restarted (until the code is cleared by a dealer tech) if you let it run out enough times. So be vigilant.

DEF was introduced for on-highway diesel engines a few years back, as the best technology so far for meeting the EPA's Tier 4 Final emissions regulations. Tier 4 Interim introduced the DPF (Diesel Particulate Filter) and EGR (Exhaust Gas Recirculation), about 2004.

EGR recirculates cooled exhaust gasses that mix with charge air for combustion. Diesel engines naturally run colder than gas engines, so not all the fuel burns during combustion. (That's where the distinctive diesel smell came from in older engines.) Recirculating the exhaust ensures nearly all fuel is burned.

The DPF captures the soot in diesel exhaust and converts it to ash during the regeneration process. Exhaust temperatures must be high enough, though, to facilitate regeneration. Most small engines (less than 9 liters) employ passive regeneration using a diesel exhaust backpressure valve - essentially restricting the exhaust, which elevates engine and exhaust temperatures high enough to achieve regeneration.

The DEF is then injected into the exhaust stream after the DPF, but before the SCR (Selective Catalytic Reduction) canister. The SCR is a second filter of sorts, made from rare earth elements (platinum, palladium, etc). The DEF and the SCR filter combine to create a chemical reaction that removes NOx (Nitrous Oxide) from the exhaust. There is a NOx sensor before and after the SCR and a dedicated control module determines how much DEF needs to be injected.

The result is the exhaust exiting the SCR (and your tailpipe) consists of only carbon dioxide and water vapor - cleaner than the air the engine is taking in - but laden with CO2.

That's the short course - and probably more than most want to know.
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Old 05-10-2015, 10:30 PM   #16
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Doing some research I came across this pic that appears to represent the current system that dodge/ cummins is using. I found it interesting that dodge/ cummins chose to still use EGR in the process. I guess they can reduce the amount of Urea consumed
Click image for larger version

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Old 05-11-2015, 06:06 AM   #17
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Quote:
Originally Posted by Jmooney View Post
I found it interesting that dodge/ cummins chose to still use EGR in the process. I guess they can reduce the amount of Urea consumed
Attachment 18030
The EGR reduces the amount of soot in the exhaust, which extends the life of the DPF. I believe all manufacturers of on-highway diesel engines use cooled EGR, but not positive. I know my company uses it on engines from 4.4L to 32L engines for on-highway and heavy equipment.
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Old 05-11-2015, 06:19 AM   #18
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Got my first truck a couple years ago that had to have the DEF . Really not a big deal anymore. Almost all the truck stops have Def right at the pump now. It uses very little except when towing . Made a trip from Michigan to south Texas couple years ago and the message came up 500 miles to empty on the DEF . 1,800 miles of towing . Probably three times that or more empty. When the system comes on to clean the filters you can see the mileage drop for about twenty minutes.
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Old 07-03-2016, 04:03 PM   #19
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DEF issues

Has anyone had a problem with the amber warning light indicating less than 10% DEF while the bars are showing 4 - meaning full.
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Old 07-04-2016, 09:38 AM   #20
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I just turned 20,000 miles on our Seneca the other day. I just keep adding DEF when needed using roughly 2.5 gallons per 1000 miles. I have done nothing else and have not even noticed regen mode, but then I'm always on the highway. Pretty troublefree so far.
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