DPF Cleaning: BLS Engine Service

Hello,
After my G5, with a BLS engine producing 105 horsepower and 240,000 kilometers on the odometer, reported a carbon buildup of 58 grams, I decided to have it cleaned.
2x 3/4 inch (due to higher flow rate) to the outlet, and then rinsed for about 2 hours. After 15 minutes, I didn't see much coming out, so I helped loosen the ash by gently tapping with a small rubber hammer. This resulted in nice, small "pellets" coming out. No, not ceramic or anything like that; when I tried to grab the pieces, they were already gone. And I didn't tap with the rubber hammer any harder than the PD normally does .
I set the ash mass to 10g and then took a logarithm. Unfortunately, I only realized now that I didn't quite follow the instructions.
"However, it would be nice if someone could comment on whether all of this seems plausible."
"The DPF (Diesel Particulate Filter) has been completely normal so far, regenerating only every 390km without me noticing. Now, during test drives of about 30km on a federal highway, the loading level fluctuated between 10.7% - 9.1% - 9.9%. (I managed to deal with the rapid increase to 10% when the turbocharger boost hose came loose on the first test drive, and it took some time for me to figure out what was happening)."

Best regards,
Andreas.

Hello,

Thank you for your report. If possible, the free length of the channels in the DPF can be checked using a long wire.
See dpf_freie_länge_kanal_druckseite.jpg in https://community.dieselschrauber.org/en/viewtopic.php?t=24243.

Regarding the differential pressure: It seems a bit high for the engine, even though it's been "freshly cleaned."
RedR32 BLS had approximately 165 mbar after a "coarse DPF cleaning" at 175,000 km.
https://community.dieselschrauber.org/en/viewtopic.php?t=24222#207381

It's a shame you didn't do a before-and-after measurement and upload it to the forum thread you originally used (which is specifically intended for that purpose).
We just don't know anything about the success of the campaign...

Best regards, Rainer.

Hello,

Quote:

It's a shame you didn't do a before-and-after measurement and upload it to the forum thread you initially used (which is specifically designed for that purpose).

I unfortunately missed that, despite reading the forum extensively - I couldn't see the forest for the trees. I'm annoyed with myself.

The wire test results were not very informative. Before cleaning, I got a reading of approximately 1/3 once, and then 2/3 once. After cleaning, I got readings of 2 x 2/3. The wire was also very thin and flexible, so I don't put much weight on those results.

As I mentioned, the DPF functioned perfectly throughout the 50,000 km I drove, even in cold weather and short-distance driving conditions.
"Before buying, I was looking for a G 5 without a DPF. The previous owner assured me that the vehicle didn't have anything like that. He bought the car new directly from VW due to time constraints and used it mainly for commuting between the Harz region and Lake Constance. All inspections, etc., were done at VW. And as far as I could tell, the 507 oil wasn't used, because VW also assumed it was "without DPF" - which is really weak, especially when you see the invoices."
Perhaps the filter didn't fully clear because more ash fell, or because this ash had a more solid consistency.
But that's just extra information, as there's nothing I can change about it anyway.

Is it now advisable to increase the ash content, perhaps to 20g, since the cleaning process wasn't very effective?

With best regards and inquiries,
Andreas.

Quote:

Would it now be advisable to perhaps increase the ash content to 20g, since the cleaning wasn't very good?

Well, it's no longer possible to determine how good she was. After all, there's no comparison to "before."

What color were the particles? Was a regeneration process performed immediately before the DPF was removed, and was the engine then turned off directly afterward, with the filter being removed?

Yes, I performed the regeneration process until 0% and then went on stage.
The crumbs were a light beige color. However, I couldn't pick them up between my fingers because they immediately dissolved. I believe they were solidified ash that corresponded in diameter to the filter tubes.

I've compared the "BLS roughly cleaned" log with different speeds again, and I'm seeing approximately a 25% higher resistance. Hmm...
I would be satisfied if we could easily handle another 100,000 to 150,000 units.

I just realized that I could probably convince a friend who owns a BLS model with around 160,000 km to participate in a test drive so I can have a basis for comparison.

Best regards,
Andreas.

Quote:

I could try to convince an acquaintance who owns a BLS model with approximately 160,000 km to participate in a test drive for comparison purposes.

Is the...
http://www.spritmonitor.de/de/detailansicht/354700.html
Sure, go ahead.

"What does 'logge' mean?"

Greetings.
m;

Quote:

...but not using the 507 oil, as VW also assumed "without DPF" - really weak, especially when you see the invoices. Perhaps the filter didn't become completely unclogged because more ash fell into it, or because this ash has a more solid consistency.

It went wrong. Low-ash oil has its purpose in vehicles with DPFs.

So far, I have only cleaned my own DPFs, and in those cases, I didn't find any chunks, but rather a reddish-brown liquid. After cleaning, the filter tubes were completely clear again.

Best regards, Rainer.

Quote:

Is the http://www.spritmonitor.de/de/detailansicht/354700.html Is that also OK?

Sure, go ahead and share it. Maybe I can generate a pressure differential characteristic curve for ash loading. The logs that have already been published here are mostly from 2.0 TDI engines, which aren't very useful for me.

Quote:

"What does 'logge' mean?"

Revolutions per minute (RPM) and pressure difference at full throttle: 1500-4000 RPM.
Loading coefficient, ash content, and mileage are still important factors.

Quote:

So far, I have only cleaned my own DPFs, and in those cases, I haven't seen any chunks, but rather a reddish-brown sludge.

I also expected it to work like in YouTube videos or as I'm familiar with from oil boilers.
No, just light floating particles like dust or ash at first, and then add a little help to get those "pellets" going.
In the picture, you can see a few particles that have settled at the bottom, which I obviously flushed out at the end.

Hello,
Okay, so the test run with the aforementioned engine, which has 140,000 km, yielded the following results at 4000 RPM: a differential pressure of 163 mbar. This is similar to what was observed with a "roughly cleaned" BLS engine.
Ash content: 36g. Last regeneration: 110km ago. Soot load: 0%. Is it possible to have 0% soot load after 110km?
Maybe I'll force mine to 0% as well and then measure it again.

Best regards,
Andreas.

Okay,
slight relief.
It looks a bit better now that the filter has been reset to 0% regeneration.
A maximum pressure difference of 183 mbar is already quite acceptable. Also, the loading remained at 0% during a 25 km drive after that. I will continue to monitor it.

Best regards,
Andreas

@98er_alh: It's doable, but it's a shame about all the effort involved... the question is whether the DPF could have been cleaned any better due to the incorrect engine oil.

Quote:

Is it possible to have 0% battery after 110km?

If I remember correctly, the BLS engine typically uses relatively long injection times and high exhaust gas temperatures, especially compared to other TDIs. You can see both of these values in the measurement blocks of the engine control unit.
The high exhaust gas temperatures promote self-regeneration during normal operation (passive regeneration).

Best regards, Rainer.

Quote:

It's okay, but it's a shame about all the effort involved... the question is whether the DPF could have been cleaned better anyway, due to the incorrect engine oil.

Sure - I will observe and try to find a suitable filter with a verifiable history. Isn't it true that the second time you only need half the time to change it? }
Right now, I'm not under any pressure to act immediately, but I've already managed to reduce the distance by a few kilometers with my initiative.

Best regards,
Andreas

Hi.

(1) YES, BLS is a regeneration-SAVING system.
At the beginning of my measurement run, I was surprised by the 800 degrees Celsius exhaust temperature I briefly saw in my peripheral vision... apparently, it was NOT in a regulated state.

Code:

167748km 00:24:08 Block 068: Partikelfilter (Abgaswerte II)   0.0 %  Beladungs- koeffizient   35.0  Aschemasse   0.0 %  Aschelernwert         00:24:08 Block 073: Partikelfilter (Fahrzeugdaten)   20.3 l  Verbrauch seit Regeneration   370 km  Strecke seit Regeneration   516.0  Zeit seit Regeneration

On my way to my starting point (which was supposed to be a log of rotation angles), I took a quick look again.
Please note: 3 km further down the road!

Code:

167751km 00:27:56 Block 068: Partikelfilter (Abgaswerte II)   0.0 %  Beladungs- koeffizient   35.0  Aschemasse   0.0 %  Aschelernwert         00:27:56 Block 073: Partikelfilter (Fahrzeugdaten)   0.0 l  Verbrauch seit Regeneration   0 km  Strecke seit Regeneration   0.0  Zeit seit Regeneration

I'd call that regeneration.

Here's a picture of the speed-pressure graph.
It was a bit rough, but I encountered two foxes that I definitely didn't want to involve in my logging activities.