Diesel Particulate Filter - Page 3 - PeachParts Mercedes-Benz Forum

pawoSD · #31 02-07-2020, 07:40 PM

Quote:

Originally Posted by barry12345

Is rebuilt just cleaned and tested? Or the old matrix removed and replaced? I think Volkswagon dealers do want the exchange cores back.

Not sure, but any rebuilt MB part is going to have to perform to new part standards or they'd not be selling it.

nyko46 · #32 02-09-2020, 04:03 PM

Quote:

Originally Posted by ROLLGUY

Yes, I successfully cleaned the DPF on a 2009 R320 using the Liqui Moly DPF cleaning fluid from our sponsor and a pressure washer. It was fairly easy, and not at all expensive like commercial DPF cleaning services.

A MB mechanic try cleaning mine for four time times and was not completely clean. His diagnostic show as the filter still very clogged.
Car is running better than before but not as before this issue.
I read an article on internet saying that a clogged DPF will also make the glow plug light on the dash to come on. Is that correct?
My glow plug light has a random on and off.
This is the first time that I see this kind of information.
The cheapest price for a remanufactured DPF I found on a MB dealer was $936.00 before taxes. They did not give me the part number.
I want to buy an used one and try to clean myself and if it gets very clean I will swap with the clogged one and see if I can get the engine light off.
Any suggestion?

pawoSD · #33 02-09-2020, 09:09 PM

Buying a used unknown one isn't worth it. Just get a good one from MB.

Part number ----->>>> 211-490-07-81-80

nyko46 · #34 02-11-2020, 08:37 PM

Today calling the store to order a new DPF, store know the part as Catalytic Converter. More than one store uses "Catalytic Converter" as 211 490 07 81 80 part name.
Now I am questioning: are they selling a wrong part or using a wrong part name?
I found stores selling this refurbished part for around $650.00 and I am a kind of curious if the part is completely refurbished or only cleaned up and sold as refurbished.
Has someone bought this refurbished part before?

pawoSD · #35 02-11-2020, 09:11 PM

They're just using the wrong name.

nyko46 · #36 02-11-2020, 09:13 PM

Quote:

Originally Posted by pawoSD

They're just using the wrong name.

Thanks for that reply.

barry12345 · #37 02-13-2020, 06:53 AM

Quote:

Originally Posted by pawoSD

They're just using the wrong name.

Simply because it is used it in the country of manufacture or where rebuilding them. One and the same I suspect.

I am going to try to intercept the supply chain for members. The rebuilds should have different appearing welds on each end. As you have to cut one end off to change the matrix filter. The industry standard of cleaning used DPF filters is ultrasonic.

crazy4diesel · #38 02-14-2020, 06:37 PM

Quote:

Originally Posted by nyko46

About my issue with my DPF, according to MB it was supposed to have an automatic regeneration when DPF is dirt. I asked a Diesel mechanic why it did not happened and his answer was "I don't know".
Is there any possible cause why the regeneration did not happened?
This diesel mechanic tried for three times to clean the DPF but, he said, unsuccessful. He said that the car is running a little better but not as supposed to run.
Any idea about regeneration?

I think someone else also answered this. The regeneration does take place, sometimes it even continues after the car has been shut off on a long trip, but like everything it doesn't last forever. After so many cycles the regeneration become impossible because there is too much build up ash from previous regeneration. Think of it as a wood burning stove, eventually you have to clean out the ash..

The other point someone else brought up is the oil you are using, it absolutely has to be an oil spec compatible with your engine, there's no way around that one. Anything else will cause a kind of tar build up in the DPF and keep it from being able to regenerate.

crazy4diesel · #39 02-14-2020, 06:48 PM

Mercedes calls it a catalytic converter in their own parts catalog as well. I don't think it's kosher to post dealer sites here, but there are MB dealers that do serious business with discounted parts, google the part number. It doesn't look like Pelican Parts (our generous host here) carries that part. The dealer sites all have it, and all call it remanucatured, and they all have a $200 core charge as well, so that tells you what they are doing, so I think that's the only way it comes.

nyko46 · #40 02-15-2020, 08:14 PM

Quote:

Originally Posted by crazy4diesel

I think someone else also answered this. The regeneration does take place, sometimes it even continues after the car has been shut off on a long trip, but like everything it doesn't last forever. After so many cycles the regeneration become impossible because there is too much build up ash from previous regeneration. Think of it as a wood burning stove, eventually you have to clean out the ash..

The other point someone else brought up is the oil you are using, it absolutely has to be an oil spec compatible with your engine, there's no way around that one. Anything else will cause a kind of tar build up in the DPF and keep it from being able to regenerate.

Thanks for your comment about regeneration.
As my car has 118K miles and I own it since 05/18 I don't know if the previous owner drove it more in highways or city. The car had 90 K miles when I bought. I know that I drive it 270 miles per week in highways only. It is a 54 miles per day in highway.
I don't know if it is something related or not but I had for several times in the past an "engine light" for "exhaust temperature sensor". I just don't remember the code number. About oil I always use the oil recommended by MB and always use a good grade Diesel fuel from Murphy Gas station where a lot of trucks and 18 wheeler's are refilling their tanks.
After this DPF issue I asked the MB mechanic who diagnosed my car if [my DPF issue can be related with some bad sensor in the system and he said that his diagnostic computer did not showed any bad sensor. "Diagnostic only show a DPF restriction" he said."It also show that you have some bad glow plug", he said.
This issue with glow plug show me a "glow plug warning" on the clock.
This warning goes on and off while driving but car still starting normal and fast as before. Is it somehow related with DPF?
Well, this week I will be receiving a new DPF and it will be installed and diagnosed again. I hope this issue can be resolved.
Thanks for your very helpful comment about "regeneration".

nyko46 · #41 02-15-2020, 08:27 PM

Quote:

Originally Posted by crazy4diesel

Mercedes calls it a catalytic converter in their own parts catalog as well. I don't think it's kosher to post dealer sites here, but there are MB dealers that do serious business with discounted parts, google the part number. It doesn't look like Pelican Parts (our generous host here) carries that part. The dealer sites all have it, and all call it remanucatured, and they all have a $200 core charge as well, so that tells you what they are doing, so I think that's the only way it comes.

I searched this part in various websites where dealers sale it but they sale as remanufactured as you said. And also all of them charges $200.00 as core.
I called one of them about catalytic or DPF and they say that their catalog mention this part as c. converter.
Anyway I bought a new one and has warranty from manufacturer which I don't know who is this manufacturer.
According to MB diagram dealer say that I am buying the correct part.

pawoSD · #42 02-15-2020, 10:26 PM

Bad glow plugs are no good either. That means on startup you might have one or more cylinders misfiring for a moment which will send a bunch of unburned diesel/smoky exhaust down into the DPF, just making things worse.

nyko46 · #43 02-15-2020, 11:44 PM

Quote:

Originally Posted by pawoSD

Bad glow plugs are no good either. That means on startup you might have one or more cylinders misfiring for a moment which will send a bunch of unburned diesel/smoky exhaust down into the DPF, just making things worse.

I agree. That is why I will fix the glow plug issue before installing a new DPF.
In the morning or afternoon when starting my car I don't have smoky exhaust but I noticed that the engine takes very slightly long to start.
I will check for bad glow plugs first and then, if necessary, I will change the controller also.
Thanks for the advice.

barry12345 · #44 02-16-2020, 12:27 AM

Not too worry. If the end welds appear different from each other . They have replaced the 15-25 dollar at retail DPF filter inside. As usual I had to do a little research.

I found a very small delay in startup with the common rail diesel we have. So I started a couple of others. Exactly the same. My guess is it just might be the high pressure fuel pump is just taking a second of two to develop the forty thousand psi pressure. Or it is electronic in nature. This is on a Volkswagon.

They do share some similarities with the Mercedes fuel system design. I am not even certain if the glow plugs come on at temperatures above 50 degrees. Even way back with the 2000 tdi we had. A flash at best of the glow plug indicator as you turned on the key was it. I also think I remember the manual stated no glow plug operation above a certain ambient temperature occurs. That engine still had an injection pump and the start was seemingly instantainious in comparison. They have done a lot of development since the 2000 model. That engine sounded like a thrashing machine when started really cold. At temperatures even gas cars had issues starting. No sign of this with the common rail diesel.

pawoSD · #45 02-17-2020, 01:38 AM

When my DPF failed (code was DPF efficiency not to specification) in the morning when starting the car I'd actually get a small puff of exhaust and it smelled like an old diesel firing up. I never got to see the removed unit but I suspect the grid inside the DPF was partially damaged/melted/missing. With the replacement DPF there's zero smell at any time even during an ice-cold startup.