Turbocharger damage due to blocked oil supply lines

Power loss, malfunction indicator lamp (MIL) on.

Damage to the exhaust turbocharger.

After damage to the exhaust turbochargers, the oil supply lines are often not replaced and the oil is not changed, this can lead to damage to the exhaust turbocharger again.

Further, fault code entries in the preheating system or to the charging pressure controller (variable turbine geometry) are not considered.

For N57X, additionally the following faults can be stored: 292200 Charging pressure controller (variable turbine geometry): Position sensor in charging pressure controller faulty or undervoltage 48F6 in charging pressure controller (variable turbine geometry)

Important: Subsequent damage is not covered by the (replacement parts) warranty.

The oil supply lines for the exhaust turbocharger are clogged or blocked by oil sludge/coking. Due to that, oil supply to the exhaust turbocharger may be inadequate and can cause damage to the exhaust turbocharger again.

Malfunctions in the preheating system can lead to clogging of the diesel particulate filter and thus to problems with the charging pressure control or the charging pressure build-up. Consequence: Problems at cold start or the engine does not start due to a faulty preheating system. Power loss or overheating of the exhaust system.

If the new exhaust turbocharger is not filled with enough oil prior to installation, the shaft bearings can be damaged at the first starting operation itself.

Proceed as follows in response to a customer complaint: 

If fault code entries are available for the preheating system, the preheating system must be repaired. Then delete the fault memory.

An engine oil and filter exchange must first be carried out for the engine at all costs.

As the oil feed line - particularly in the area of the connection to the exhaust turbocharger - is normally clogged at increasing distance readings, ALWAYS check them for coking/obstruction and clean or replace them.

If the diesel particulate filter is foul with oil, clean it or replace, if required.

In order to exclude that the oil supply to the exhaust turbocharger is not impaired due to faulty crankcase ventilation, carry out a function check of the crankcase ventilation in this regard. The corresponding test module can be found in ISTA at: Drive - Digital Diesel Electronics - Engine ventilation - Engine Internal pressure

When installing the exhaust turbocharger, it must, prior to connection to the oil feed line, be filled with fresh engine oil to the top through the oil inlet hole. Important: Never use liquid sealing compounds when connecting the oil line as they can block the oil ducts in the transmission housing. After installing the exhaust turbocharger, start the engine and let it run at idle for 2 to 3 minutes before increasing the speed. If required, initiate a regeneration of the diesel particulate filter Important: For vehicles with N57X-engines that have fault code entries that are at the top, a successful diesel particulate filter regeneration must be carried out. Then delete the fault memory.

When installing the exhaust turbocharger, it must, prior to connection to the oil feed line, be filled with fresh engine oil to the top through the oil inlet hole. Important: Never use liquid sealing compounds when connecting the oil line as they can block the oil ducts in the transmission housing.

After installing the exhaust turbocharger, start the engine and let it run at idle for 2 to 3 minutes before increasing the speed.

If required, initiate a regeneration of the diesel particulate filter Important: For vehicles with N57X-engines that have fault code entries that are at the top, a successful diesel particulate filter regeneration must be carried out.

Then delete the fault memory.