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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 02-25-2014
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Rich Johnson Rich Johnson is offline
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Default DEF or Diesel Fluid

Recently attended an annual RV show in Springfield, Mass. Mostly disappointing except for all the beef jerky vendors, towing trailers, very few Coaches, and virtually no accessories. But a discussion with one of the coach vendor personnel disclosed that as of 2014, all diesel RV's are mandated by the EPA to inject DEF into the exhaust. Interesting mandate.

I did some internet searches on what DEF is made from. Turns out is made from Distilled Water and Urea. When injected into a hot exhaust stream it breaks down into ammonia and carbon dioxide, which then reduces NOX into something we can breathe.

So I'm saying to myself carbon dioxide? Isn't that the evil stuff we exhale regularly and is considered a hazardous material to the earth by the EPA? OK maybe they're plenty smarter than old timer me.

Then I look up Urea on the internet and it says it's primarily Urine. (are we all thinking what I'm thinking?)

Anyone heard of a kit that injects black water into your exhaust pipe ! A simple filter for the solids and voila we're saving the earth.
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  #2  
Old 02-25-2014
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I'm not as traveled as many here, but last fall, returning from the WOG rally, I stopped to fuel up someplace in KY, I think it was. Anyway, I pull up to the pumps and I see this pump and it said DEF. I said *** is that? I filled up with fuel and left. Later I got on line to see what it was all about. You might have something Rich. Who ever thought you could pee in an engines exhaust to clean up the air
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Old 02-25-2014
BrianS BrianS is offline
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Urea is a component of urine, but saying it IS urine is wrong. Gets nitrogen out of the body.
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Old 02-25-2014
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Brian, Lighten up I didn't think anybody would actually take me seriously about peeing into my exhaust. I really can't speak for Rich but I didn't take him serious either. I thought he was just B.S.n
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  #5  
Old 02-25-2014
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Dodge Travco motor homes had black tank exhaust injection in the 70's
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Old 02-26-2014
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Quote:
Originally Posted by Rich Johnson View Post
Anyone heard of a kit that injects black water into your exhaust pipe ! A simple filter for the solids and voila we're saving the earth.
Ahhh, yes! The elusive Crapalytic Converter that Garder Yeaw has been working on for the past few years may have a purpose after all! Think of the million$s he could reap from an "Organic DEF" product.
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  #7  
Old 02-26-2014
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go gardner go!!

I will never have a DEF tank on anything i own,no way i can afford all the issues that are bound to come up with yet another emission control.
How do you keep the DEF from freezing?
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Old 02-26-2014
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Randy , you are so right! No new diesels in my future. I work with 30 school buses at various ages and by far the least reliable and the most expensive to work on is the new DEF units. Hopefully they will figure out how to do it right some day but for now between the exhaust "burn outs" and the 30 to 50 electrical sensors and probes that control the new technology that go bad and CEL'S and various stages of "limp" mode they trigger I finally refused to drive one. I do activities all over the state and got tired of having to waste 45 minutes on trips pulling into rest areas with 40 to 60 students and do a mandatory burn out . On top of that my new International spent over 35% of its time the year I drove it at an International dealer getting "sorted" which has yet to happen. With less than 50,000 miles on it she now has been put on a short route around the "Bus Barn" where the service truck can get to it when it fails.
Wanderlodges are the future! They will run forever (with tender loving care).
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  #9  
Old 02-26-2014
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Quote:
Originally Posted by Randy Dupree View Post
go gardner go!!

I will never have a DEF tank on anything i own,no way i can afford all the issues that are bound to come up with yet another emission control.
How do you keep the DEF from freezing?
Randy, I drive truck in the summer and it uses DEF and I have driven trucks in the winter with DEF. DEF begins to freeze at around 10 degrees F. When the truck is operating the system provides heat to the tank to prevent freezing. They make the tanks out of some kind of plastic to withstand freezing. I have had the tank frozen solid at -10F and within a short period of driving the tank was thawed enough to supply DEF during the regen cycle.

Here is a system for black water "On the Road disposal".
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  #10  
Old 02-26-2014
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Just wandering!
My buddy in Alaska says they never thaw out when its bad cold,and the equipment can't idle to stay warm.
We need to keep this about equipment,and not get political!
Old man Finn will have my head if it goes Political!

Interesting stuff,the diesel techs of 2020 will all be wearing suits and will have a "helper" to replace bad stuff.
Laptops on every tool box!

Dang,i sound like my dad and grandad!!
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