I was reading a few threads where folks where wondering what happens with regeneration, passive and/or active, or how it works. So, I searched and found a few .pdf files from Cummins, as well an article from another source. One of the .pdf files also explains the cooled EGR process, and the urea process that other engines are using, for example, like VW's TDI.

Rather than write a synopsis, you can read for yourselves.

http://www.heavydutytrucking.com/2006/10/126a0610.asp
http://www.everytime.cummins.com/assets/pdf/4971129.pdf
http://www.everytime.cummins.com/assets/pdf/4971141.pdf

 

Think I'll just keep my 12 valves

 

I will keep fixing my old junk

 

That was good reading. Thanks for posting.

 

Sounds like several layers of complexity looking for a weak link. And a very expensive repair.

 

Don't have to repair it just get rid of the dpf. Most truble on these new trucks is the emissions so once it's go were good to go.