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Old 07-30-2014, 09:51 PM   #1
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DEF Or No DEF

When did Emission Regulations require that manufacturer's of diesel motorhomes use DEF systems (Diesel Exhaust Fluid) in their coaches?

Thanks for your input!
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Old 07-30-2014, 09:57 PM   #2
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Think it was model year 2010, my 2009 dosen't use it
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Old 07-30-2014, 10:26 PM   #3
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Thank you no3putt!
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Old 07-30-2014, 10:27 PM   #4
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The year they went to DEF depends on the brand. I think Ram just went to DEF. The Ford 6.4 built by Navistar was a DEF engine, and the new Ford built diesel is also DEF. I don't remember when GM's Isuzu diesel went to it. Mercedes has used it successfully for years.

I do know that anyone filling up their DEF tank needs to be very careful, and put not one drop of DEF in their diesel fuel tank. The stuff sets up like concrete in the fuel lines, pumps, HPOP, etc. And the whole system must be thrown away and replaced--requiring raising the cab. It's a $12K repair.
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Old 07-30-2014, 11:14 PM   #5
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Quote:
Originally Posted by Bamaman View Post
The year they went to DEF depends on the brand. I think Ram just went to DEF. The Ford 6.4 built by Navistar was a DEF engine, and the new Ford built diesel is also DEF. I don't remember when GM's Isuzu diesel went to it. Mercedes has used it successfully for years.

I do know that anyone filling up their DEF tank needs to be very careful, and put not one drop of DEF in their diesel fuel tank. The stuff sets up like concrete in the fuel lines, pumps, HPOP, etc. And the whole system must be thrown away and replaced--requiring raising the cab. It's a $12K repair.

Ford started putting the 6.4's in their trucks in 2008 and up to 2010. The 6.4 does not have DEF. The 6.7's, which came out in 2011, was the first year of DEF for Ford.
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Old 07-31-2014, 05:54 AM   #6
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For motorized coaches, you will have to go by the chassis mfg. date; not the year model of the coach. The only exceptions would be coach builders like Monaco, Foretravel, etc that build their own chassis. Example: coach builders usually use a chassis from the previous year that the coach will be titled as.
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Old 07-31-2014, 07:50 AM   #7
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2009 Spartan 425 hp Cummins no DEF
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Old 07-31-2014, 08:03 AM   #8
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2010 coach on 2011 chassis. No DEF.
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Old 07-31-2014, 08:05 AM   #9
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2011 Cummins on a 2012 MH yes Def no major cost or big deal
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Old 07-31-2014, 08:25 AM   #10
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Not to mess up the thread but: our 04 HR Endevour with 8.3 Cummins does not use DEF.. What if you had a vehicle that used DEF and you did not use it.. What happens to the engine etc.. Just curious.. our 09 6.4 ford F250 did not use DEF either.
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Old 07-31-2014, 08:58 AM   #11
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Quote:
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What if you had a vehicle that used DEF and you did not use it.. What happens to the engine etc.
You mean you try to run the engine without DEF? It won't run. It'll just shut down. I think most of them have a "limp" mode that'll let it run (slowly) for a short while, but then nothing.

Or did you mean you have a DEF system and you just let it sit for an extended period?
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Old 07-31-2014, 10:34 AM   #12
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DEF is a huge improvement for the environment. Our 2011 Allegro RED averaged 9.4 mpg with DEF ebgine and our 2014 Phaeton is at 8.7 mpg.
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Old 07-31-2014, 10:54 AM   #13
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def

In 2010 engine manu. were required to use def, except NAVaSTAR whiched used EGR {no DEF}.IN pre 2004 engines there was no egr. In 2004 they had to add EGR to the engines, that stayed that way tell 2010,then in 2010 they cut back on EGR then added DEF. due to model yr changes in engines & chassis you may have a pre. yr model engine in a new chassis { 2003 engine in2004 chassis}

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Old 07-31-2014, 11:08 AM   #14
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All the above is confusing because the DEF start date is NOT based on chassis year or RV or chassis manufacturer. EPA regs require that only diesel ENGINES built for highway use on or after Jan 1, 2010 meet a certain specification for Nitrogen oxide emissions. Depending on what engine is used in the chassis, it may or may not need to meet that spec. Plus, a few engines were able to meet the initial spec without adding a requirement for DEF.

SCR technology with DEF is the most common means of meeting the 2010 EPA spec, but a few engines were clean enough in 2010 that they met the EPA spec without it. Most of those have now added SCR as the EPA specs got tighter.

The complication is that many 2010 and later chassis were built with pre-2010 engines which did not need to meet the EPA spec. Some RV chassis made as late as 2012 still got engines built in late 2009, so had no DEF requirement.

This article from Cummins will answer most common questions about use of SCR & DEF. http://www.cumminsfiltration.com/pdf...es/MB10033.pdf

Ford Powerstrokes began using SCR/DEF with the 6.7L engine. Cummins (and Dodge RAM) got it with the introduction of Cummins 6.7L diesel engine. The Cummins ISL & ISX also got DEF starting 1/1/2010, as did all Detroit DD13, DD15 and DD16 engines. Cat didn't make any on-road engines for 2010, though they now use SCR/DEF to meet off-road EPA specs. Duramax got SCR/DEF with the LML version of the 6.6L engine, which I think began with the 2011 model year.

Confusing? You bet!!!
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