FAQ

A proper working condition, i.e., possible irregularities and malfunctions of turbochargers are diagnosed according to common symptoms and irregularities. We have selected a few frequent questions ...

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There is a black smoke in the exhaust, what to do?

This symptom is usually a result of general wear of the engine, or unadjusted or worn high-pressure fuel pump. Even if the turbocharger is fully functional, soot in the exhaust system can block access to the turbocharger, or settle down on the turbine blades. This results with a dynamic unbalance which at high revs (up to 250.000/min) creates large inertial forces which increase the bearing and rotor loading. Consequently, even if the turbocharger is functional, after putting the engine in order, cleaning and dynamic balancing of the engine is indispensable.

Possible causes of the problem:

  •     dirty air filter
  •     resistance (blockage) or leakage in the exhaust line, prior to turbine
  •     resistance (blockage) or leakage in the delivery pipe, behind the compressor
  •     dirty or damaged compressed air cooler (intercooler)
  •     air leaks in the inlet manifold (seal)
  •     dirty air filter
  •     turbine and rotor damage, due to the entry of external parts: nuts, screws, ring parts, valves, etc.
  •     wear of rotor and bearings
  •     defective valve for boost pressure adjustment
  •     clogged turbocharger oil supply
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