11 65 020 Turbocharger damage due to blocked oil supply lines

In event of turbocharger damage: 

• If:

  Power loss, malfunction indicator lamp on.

  Damage to the turbocharger.

  After damage to the turbochargers, the oil supply lines are often not replaced and the oil is not changed, this can lead to damage to the 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 under voltage 48F6 in charging pressure controller (variable turbine geometry)

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

• Cause 

  The oil supply lines for the turbocharger are clogged or blocked by oil sludge/coking. Due to that, oil supply to the turbocharger may be inadequate and can cause damage to the 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 turbocharger is not filled with enough oil prior to installation, the shaft bearings can be damaged at the first starting operation itself.

• Action 

  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.

  Engine oil and filter change must be carried out on the engine absolutely, so as to guarantee operation of the changed turbocharger with fresh oil! Since the oil feed line as well as the oil return line may coke with increased mileage especially in the line connection area of the turbocharger, the followings rules are applicable:

  • Turbocharger exchange due to electrical fault on the turbocharger (vehicle mileage/km up to  100, 000 km): If the turbocharger is replaced due to an electrical fault, the oil feed line and oil return line need not be replaced. If the turbocharger is offered only along with the oil return line and oil feed line in the BMW parts catalogue, it can be removed from the order list again.
  • Turbocharger exchange due to electrical fault on the turbocharger (vehicle mileage/km starting from 100, 000 km): If the turbocharger is replaced due to an electrical fault, the oil feed line and the oil return line have to be replaced.
  • If the oil return line is exchanged, then the connecting pipe to the oil sump must ALWAYS be cleaned, as this can even coke!
  • Turbocharger exchange in case of mechanical damage: If the turbocharger is replaced due to a mechanical damage, the oil feed line and the oil return line have to replaced ALWAYS.
  • If the oil return line is exchanged, then the connecting pipe to the oil sump must ALWAYS be cleaned, as this can even coke!

  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 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 turbocharger, it must, prior to the mounting of the oil feed line, be topped up with fresh engine oil to the brim through the oil inlet hole. Important: Never use liquid sealing compounds when connecting the engine oil pipe as they can block the oil ducts.

  After installing the 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