Urea crystallization, muffler with SCR-catalytic converter, regeneration


The function is used to run a service regeneration of the SCR-catalytic converter.

When urea is sprayed into the catalytic converter during cold work cycles that never reach high exhaust temperatures, the SCR-catalytic converter is filled with crystals (urea deposits). If the crystallization level becomes too high it cannot be removed with normal engine operation, instead a service -regeneration is required.

The SCR-catalytic converter will reach a suitable temperature by increased engine rpm and activation of the engine fan and EPG/damper.

Note:

Before the function is started, a restriction plate (special tool 21190670, can be purchased from authorized dealers) must be installed on the exhaust system between the turbocharger and exhaust pipe. As well, disconnect the EPG-valve's connector.

The function's run-time is approx. 50 minutes.

During the process the exhaust temperature is very high (up to 500° C).

NOx and other substances will be emitted during the process.

Make sure that the vehicle is in a suitable outdoor location.

The exhaust outlet may not be directed against anything that may be damaged by high temperatures.

If the exhausts are directed at the ground, the ground surface should be drenched with water to prevent ground damage, or place the vehicle on a gravel surface.

Make sure that the outside of the muffler is free from combustible materials.

Be prepared with a fire extinguisher in case of fire.

When the function is done, let the engine run until the indication for high exhaust temperature on the display is deactivated.

Do not forget to remove the restriction plate between the turbocharger and exhaust pipe, as well as plug in the connector for the EPG-valve when the function is done.

Change the turbo seal profile after every regeneration.

Test conditions:

Procedure:

  1. Start the function.

  2. Check that the vehicle is in a suitable location, that the muffler is not near any combustible materials, that the restriction plate is installed between the turbocharger and exhaust pipe, and that the EPG-valve's connector is unplugged.

  3. Check that the test conditions' status is OK.

  4. Select to start or cancel regeneration.

  5. Check that regeneration status becomes "In progress".

  6. The process takes approx. 50 minutes, check the values while the process runs.

  7. When the process is finished the regeneration status should be "Done".

  8. Function done.

    • If the function failed, check test conditions, turn the ignition off and on to enable restart of the function.