particulate filter restriction (ash accumulation)

[MJarske]

[/QUOn those trucks the DPF is removed and the cartridge is removed from the assemble. . its is placed in an oven and heated to something like 800 F* and back flushed with low pressure, high volume air... so the thought is that the soot is turned to ash and later sort of shaken and blown out backwards and the DPF is returned to service.....



OTE]



jelag,

I saw a video clip on the cummins site a year ago or so.

it showed a machine developed to clean the soot out of the DPF for class 8 trucks. they put the filter in a cradle hooked up a retractable hose and charged up an air tank, shot a blast of air to flush out the soot and then vacuumed out the rest and re-installed the DPF. they didnt show any oven though. did Cummins come up with another method?

 

[jelag]

I spent a couple of days in a class going over this process and equipment, as we expect it to be nationwide someday.

Donaldson is making after market kits for the heavy trucks and off road machinery in CA that are forced to install this equipment on ALL diesel engines. The kits run from $8500 - $14000 based on the size of the engine... This is for soot only... . the EGR system to lower nox is another matter... . These sales are slow as there is a huge court case going on... its like back in the late 50's and early 60's when you had to retro all cars with the PCV systems from the old breather systems...

Most other states are looking at the CA law and I assume that in a few years they will follow... so all the off road machinery, Cats, Loaders, Graders, Logging, Track Hoe's etc with these 8-12 L engines will get cleaned up... . CA feels this is a huge problem now that the cars and trucks are clean.

The Donaldson system is a cartridge that can be removed from the truck... . its put through an oven first to turn all the soot in the cartridge to ash and than the ash is blasted with air while the unit is in a shaker to remove the ash...

The Donaldson system is not designed to be re-generated. But its a much larger cartridge and is designed to have a catalyst in front of the cartridge to do some of the burn off with the excess fuel. It's design is to run 100,000 miles before cleaning.

As soot, it will hang onto any surface and you'll get that oily feeling when you rub your fingers in it... as ash it sort of floats off the part... .

We use a oven in our cleaning operation to clean brake shoes and clutch cores... any dirt, grease that is on the part burns off in the oven... . the oven is set for 700-800 with a separate afterburner chamber that runs at 1300... . so any oils and grease that burn off will vaporize at the higher afterburner temperature so that the smoke stack is clean...

Once through this process the ash goes in the garbage... as it has no heavy metals such as lead, zinc, chromium etc... Other states have different rules... but here in WA they take samples of the ash and monitor the oven...

I think this answers most of the questions...

 

[Shelby Griggs]

EB,



Any updates on what was wrong and or the fix? It seems that the C&C are having less problems with the emissions stuff, BUT that may be more due to many of them being loaded heavy and working harder than the regular trucks than the different emissions, after all they both have an EGR and DPF. I think your truck in this thread is the first C&C I have read about with an issue and I certainly think you problem have more miles than about anyone else!



SHG

 

[EB]

Shelby Griggs;



You have a PM



EB

 

[Coalsmoke]

EB, can you share with all? Way to leave a guy hanging