Cleaning your DPF filters yourself

I'm going to re-reference some manufacturer's literature from a training course I took because I'm 99% sure it stated it catalyzes the soot.

 

I think the nox gets catalyzed in the doc.

 

I would imagine that...wouldn't the engine maps be programmed with the back pressure of the after treatment system accounted for? And then all of a sudden it's running wide open with the same map...

 

DPF:
There are several methods to control or raise the exhaust temperature to “actively” manage the DPF. The methods used on EPA ’07 and EPA ’0 engines are management of the combustion process in combination with an additional oxidation catalyst. This will allow regeneration to take place under low-ambient/low-load conditions when exhaust temperatures are low, and during normal operation as well.

SCR/DEF:
Catalyst – The catalyst is mounted in the exhaust stream. It can be similar in outward appearance to a muffler. It contains chemical compounds which, in the presence of ammonia, help transform nitrogen oxides into harmless chemicals. n DEF – DEF is carried on board the vehicle as a water solution in a storage tank. The storage tank is sized to minimize operator filling, but within packaging and weight constraints of the vehicle. The storage tank and DEF dosing system must be protected from freezing since the DEF-water solution begins to freeze at approximately 11ºF (-12ºC). n DEF dosing system – The DEF dosing system and the decomposition reactor spray a fine mist of DEF under all environmental conditions. The DEF amount has to be carefully controlled so that the availability of ammonia is closely matched to the amount of NOx being produced by the engine in real time.

Taken from this article: https://cumminsengines.com/uploads/docs/4971141.pdf

 

So I pulled up the reference material (direct from a major equipment manufacturer). This is what is stated directly in their training literature:

Soot is caused by incomplete combustion. The DPF collects the soot and elevated exhaust tempetatures convert the soot into CO2 and water.

Ash is a residue of oil or fuel. The DPF collects the ash. The ash must be removed using a special service tool. The ash is not combustible.

The DOC is designed to oxidize carbon monoxide, hydrocarbons and soluble fractions. These reactions also generate heat to help oxidize PM in the DPF.

NOx is reduced by both the EGR system as well as the SCR catalyst. The DEF is sprayed into the exhaust ahead of the SCR catalyst. The DEF reacts with the SCR catalyst to convert NOx into Nitrogen Dioxide.

I can't see why one of the largest equipment manufacturers on the planet would be feeding all their service techs untruths.


Another misconception I will clear up is DEF usage. DEF is sprayed into the SCR at all times once the system is at operating temperature, not just during regen. The proper order of aftertreatment devices is DOC, DPF and the SCR catalyst.

 

It’s a remanufactured DPF filter you normally get them when you switch your old ones for your new ones

 

I have a 2013 Freightliner Cascadia with 410,000 miles on it and took it to Freightliner he said it was a knock sensor got that fixed then they said that the DPF was clogged and that it was going to cost me $13,000 to get it replaced The whole box I asked them can’t you just clean the filter they were clueless just wanted to know if the DPF pressure is high When at a low idling if I get the DPF filter is clean with that solve the problem I’m 99.9% it would but just looking for feedback on here thank you and appreciate any information you haveQUOTE="fargonaz, post: 7757443, member: 159298"]DPF:
There are several methods to control or raise the exhaust temperature to “actively” manage the DPF. The methods used on EPA ’07 and EPA ’0 engines are management of the combustion process in combination with an additional oxidation catalyst. This will allow regeneration to take place under low-ambient/low-load conditions when exhaust temperatures are low, and during normal operation as well.

SCR/DEF:
Catalyst – The catalyst is mounted in the exhaust stream. It can be similar in outward appearance to a muffler. It contains chemical compounds which, in the presence of ammonia, help transform nitrogen oxides into harmless chemicals. n DEF – DEF is carried on board the vehicle as a water solution in a storage tank. The storage tank is sized to minimize operator filling, but within packaging and weight constraints of the vehicle. The storage tank and DEF dosing system must be protected from freezing since the DEF-water solution begins to freeze at approximately 11ºF (-12ºC). n DEF dosing system – The DEF dosing system and the decomposition reactor spray a fine mist of DEF under all environmental conditions. The DEF amount has to be carefully controlled so that the availability of ammonia is closely matched to the amount of NOx being produced by the engine in real time.

Taken from this article: https://cumminsengines.com/uploads/docs/4971141.pdf[/QUOTE]

 

even if you decide to change 1-box you can get it fixed quick. Backorder is about 2 months for EPA10 1-boxes. Two day ago one of the Daimler executives told at DTNA Solution that the factory is making 400 1-boxes each day but they are or GHG14 or GHG17... Daimler sucks , its like Volvo now. No way to buy liners, some emission components, ...

 

I have not seen platinum in DPF. I think its a special ceramic.