Hier wird das Spülen des Partikelfilters beim 2.0TDI MKB: BPW beschrieben.
Ein paar Daten zum Fahrzeug:
A4 8E B7, manufactured in 2007, mileage 180,000km, first-generation particulate filter, experiencing occasional issues with jerking at high loads and engine speeds around 1500 rpm.
Die Aschemasse die im STG eingetragen war betrug 56g (max. 60g).
Vor dem Spülen des DPF wurde der Differenzdruck des Filters mit dem VAG Tester bestimmt.
Bei 2000u/min betrug er 40hPa
After rinsing, it was only 5hPa.
Since the 8E model was launched in 2001 as the B6, it was never intended to be equipped with a particulate filter.
Leider ist der DPF sehr verschachtelt eingebaut. However, no special tools are required to remove it.
Before expanding, you should obtain the following parts:
- 6 Kupfer-Muttern M8, N 902 002 01
- Metal gasket between turbocharger and filter 3A0 253 115
- Solid gasket between filter and flexible hose 1H0 253 115
- Copper paste for mounting the nuts.
To convert all non-water-soluble residues within the DPF into ash, a forced regeneration should be performed before removing the DPF.
Only the pure ash can be flushed out with water from the filter.
Procedure for removing the DPF:
The following parts must be disassembled first:
- Engine cover
- Airflow management.
- Air filter
- Differential pressure sensor
- AGR valve
- AGR cooler
The AGR cooler is connected to the water circuit.
To prevent coolant loss, it is important to have the appropriate tools to seal the lines.
It is advisable to verschandeln the AGR valve and the AGR cooler periodically.
The AGR was previously very clogged. The function was working, though.
After disassembling the parts mentioned above, you will have a clear view of the DPF flange.
He is attached to the turbocharger's stud bolts with 3 nuts (SW12, M
).
After loosening the three nuts on the turbocharger, the nuts on the flange connecting to the flexible pipe must be loosened. That's the most difficult part, because it's very hard to reach the nuts.
If possible, the right driveshaft should be removed. It makes the work much easier.
The exhaust pipe is attached to the transmission housing with a spring-mounted bracket.
The bracket is attached to the transmission housing with 2 screws (16mm socket, M10 thread).
Once the bracket is removed, the flexible pipe can be detached from the DPF flange.
Now, the oxygen sensor needs to be removed.
The connector for that is located behind the coolant reservoir on the firewall.
Various cable ties need to be cut.
When removing the oxygen sensor, be careful not to kink the cable directly connected to the sensor.
In addition, the temperature sensor at the DPF inlet must be disconnected.
Now, you need to disconnect the hoses running from the DPF to the differential pressure sensor (G450).
These should also be cleaned.
Now, the DPF can be removed from the engine compartment, positioning it upwards.
Flushing the filter:
The inlets and outlets of the differential pressure lines, as well as the housing for the temperature sensor and the lambda sensor, should be closed off using appropriate screws.
I initially used a garden hose to flush out the DPF.
Unfortunately, it shows little success.
The use of a high-pressure washer with a rotating nozzle resulted in greater cleaning effectiveness.
Since the DPF (Diesel Particulate Filter) in BPW systems is a closed system, it is important to pay attention to the direction of the cleaning process, specifically to verschandeln it against the flow of exhaust gases.
The filter should be rinsed thoroughly several times with a pressure washer, in all possible orientations. Compressed air can be used to remove the water from the channels.
A thin wire is used to verify the effectiveness of the cleaning process. Can it be inserted into one of the ceramic channels, approximately 21cm in length? Is the filter free of ash?
It is recommended to dry the filter with compressed air before reinstalling it.
I let the filter dry for 4 hours above a heater before installing it.
The installation is done in reverse order.
Make sure to screw in the oxygen sensor in a way that the cable doesn't get twisted.
When tightening the flanges, all screws or nuts should be coated with copper paste.
Furthermore, it is important to ensure that the sensor cables are connected exactly as they were before. All cables and hoses should be kept away from any hot parts of the exhaust system.
After installation, the ash content value in the control system should be reset.
A value of 6g is recommended because this method cannot completely verschandeln the filter.
It may be necessary to adjust the value. Doesn't he regenerate the DPF too frequently?
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