Pictures of DPF and DOC/CAT

[JSmole]

Here are some pic's of the DPF and DOC/CAT on my truck. Had to take a look on the inside! Do have to say that I am inpressed with the performance of the DPF. The outlet and tailpipe have almost zero soot.

The truck is working great, no flashes, no issues since new June 1 this year. Towing 10,000 pound trialer and have almost 2700 miles on the truck.

Will try to post more pic's.

 

[JSmole]

Thought the verbage would attach as well anyway the first picture is the outlet of the DOC/Cat. The second is the Tailpipe/muffler at the far end. Third and forth shows the inlet to the DPF. The Fifth is the outlet of the DOC/Cat.

 

[Wolfy]

Thought the verbage would attach as well anyway the first picture is the outlet of the DOC/Cat. The second is the Tailpipe/muffler at the far end. Third and forth shows the inlet to the DPF. The Fifth is the outlet of the DOC/Cat.

Thanks JSmole, for posting these images.



Did you mean to say that #1 and #5 are both of the DOC outlet, or is #5 of the DPF outlet?

 

[courierdog]

OK just so I understand.
We have pics of the Cat (DOC) Outlet, but no Pics of the Cat Inlet
We have pics of the Soot Accumulator (DPF) Inlet but no pics of the Outlet.
Is this correct.
I would like to see what it looks like end to end to get a mental image of what is causing the Catalyst Full message in some trucks while not in others.
So far it would appear that perhaps the blockage is the one single screen in the inlet of the Soot Accumulator (DPF) or is this a gross over simplification based on the images as presented.
Thanks

 

[JSmole]

More pic DPF

Courierdog, Wolfy

I did not remove the Doc/Cat from the truck. The first and last pictures are of the DOC outlet. Here are some pic's of the DPF outlet the last ones were out of focus.

The screen in the DPF looks to be full length of the can, I also, shined a bright light in to one end and could not see any light coming through the screen. The screen/grid openings in the DPF look larger in size than what is in the DOC, about 40-50% larger. This maybe due to the amount of soot in the DOC's screen.

Not able to see how the ash is stored inside the DPF.

One other item, there is a . 128" diameter hole drilled on the bottom of the DPF, outlet end . This hole penetrates into the can and is located just behind the screen outlet. Not sure but maybe for moisture drain. Caution over dry grass when it is in REGIN.

Reason for pulling the DPF, was to look inside and see what is going on. Some truck owners are reporting smoke from the tailpipe. Just wanted to try and keep tabs on the condition of the screen and blockage if any.

 

[courierdog]

Have you been able to take any pictures of the Nox Absorber which is ahead of the DOC and DPF. It may require a bore scope as it is in the curved portion between the Turbo and the DOC.
It is most definitely not a system to be tampered with or removed without penality. The ECM/PCM may even monitor when the system has been disassembled as the pressure differential switches will register any change however slight, as this is how it determines when to initiate the active regeneration.
My dealer jokes with me by saying they are going to put a wireless link on my truck to monitor its activities.

 

[JSmole]

That maybe something I will check on as well. I will have to drop the pipe from the turbo to get a gook look at it. May not be able to see the outlet end of the NOX, but I will try. I will post the pic's when I do.

Looking under the truck I can see the heat shield that is around the pipe to protect the bell housing on the trans. It appears only as straight five inch pipe, doesn't look like a filter or appear to look as such. I hear that these trucks are equiped with such a filter for NOX emissions, but I have not confirmed it's presents. No sensors present at this location that I could see.

Anytime I demate connectors, I remove the positive cables form the batteries.

Properly mate all connectors and fittings and double check each of them before reattaching battery leads.

I don't believe the ECM/PCM cares if the sensors have been changed or demated, as long as they report/send voltage or pressure readings that is within the specifications programed in to the ECM/PCM. If not, you will get a light/code, telling you otherwise.

Going wireless would be nice, but would be limited to the range of the modem. The new computers in these trucks store all kinds of data from the sensors installed thought the engine/drive train. Speeds,idle time, shift pionts, temperatures EGT/Coolant Highs, Torque, Total run time, Miles, Max. speed, list goes on and on. If you have a good service rep. relations ask him if you could look at the operating performance of your truck, you will be amazed. Most of the data is for them to see what is happening to the truck overtime as well as how it is operated.

Sorry for the carry-on

 

[courierdog]

Thanks for the info, and from my reading and speaking with both my Service Manager and the Head Diesel Tech there is a lot of info available on the ECM/PCM hence the joke about it monitoring everything. Which may not be a joke as the cost of implementing the ECM/PCM with the extended capabilities was part of the 6. 7 design. The Daimler and Cummins are extremely interested in perfecting the diesel engine and monitors and computers are now very inexpensive. I have an engineering background, retired in 2001, now I drive in Courier Service for a "Hobby", pays for the new "Toy Truck". I enjoy it alot and am always on the look out for people who are also curious about the inner working of the "Toy" ha ha
Thanks for your time and Pics.

 

[JSmole]

Thanks Courierdog, and your welcome. Same here.

 

[jelag]

Is the CAT behind the DPF??

Are there any sensors connected to the CAT??

I might mention that there is a move by the Fed's and DOT to have the ECM in the truck talk to all other systems and report back to the ECM and output device all information in a STANDARD data stream... .

They are asking Bendix, Eaton, etc through SAE to come up with a standard data stream and connect the ABS, Engine, Transmission computers on Class 8 trucks so one DISPLAY in the CAB and one port under the dash will allow a tech to connect to the ECM and test and repair all systems, no matter who made them.....

What this means, is that a semi can connect to any trailer and the ECM can read and test the on board ABS (trailer brakes).

What I've seen is an early production screen like the touch screens on GPS that allow the driver to look at and test all on board systems and once the tech is plugged in, he can trouble shoot any system on the truck... .

Thought I'd share where I think this is going.....

 

[JSmole]

The Cat/DOC is in front of the DPF.

There are no sensors attached to the DOC itself. Just in front of the attaching flange upstream from the DOC there is a thermocouple and an O2 type sensor installed.

Trucks are going high tech! Kenworth has a nice system on the new ones not sure about all the features or capablities. Most can't afford the programs for these trucks.

 

[WRStrong]

sooty exhaust pipe

Very informative. I'm stumped. My 6. 7 tailpipe ran totally clean for about 2000 miles. Now after 4000 miles and a reflash, the tailpipe is as sooty as any 5. 9 ever was. It is even blackening my rear fender like the good old days. I am getting no check engine lights or other messages and the truck seems to run great. Is anyone else experiencing a sooty exhaust pipe on their 6. 7?



Still trying to figure this new truck out. I guess I'll just drive it.



Regards

 

[2Rowdy]

Mine was similair to yours no soot for about 6000 miles or so. Now it has good soot. I even noticed the other morning morning with a car following behind with its lights on I could see it. No problems other thanthe 245a about 3 times.

 

[WRStrong]

2Rowdy,



How do you like the 988 springs? Truck does not look nose high. I need these since my truck bottoms out.