What Causes On The Turbocharger Overheat?


Causes of Overheating:

  • Hot shut down. DPF issues, such as regeneration, resulting in increased exhaust gas pressure and temperatures which leads to overheating of the turbine side of the turbocharger.
  • Remapping, chipping or over-fueling.

What is Overheating?

  • Overheating is a term used to describe components that have been subjected to abnormally high exhaust temperature or insufficient cooling.

Signs of Overheating:

  • Discolouration at the hot end of the turbine wheel, spreading along journal bearing area.
  • “Heat soak” from the turbine side of the turbocharger through to the compressor side, causing discolouration to the turbine shaft and bearing housing.
  • Discolouration of internal components including thrust washer and flinger; occasionally without evidence of wear.
  • Collapse (loss of tension) to turbine end piston ring.
  • Carbon build up in the oil feeds and piston ring area.
  • Abnormal, excess wear to turbine end piston ring and groove.
  • Turbine blades appearance being uniformly curved downwards.
  • Small sections or edges of the turbine blades being fractured/partial loss of blades.


  • Check the DPF is in good working condition.
  • Ensure there are no leaks in the cooling lines.
  • Give the turbocharger time to cool, particularly after long journeys or harsh driving conditions.



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