Failure from excessive exhaust temperatures or shutting the engine down without allowing time for the
turbocharger to cool down results in carbon build-up. It is recommended that you idle the engine for 2 to 3
minutes to cool the bearing system before shutting down. Turbine end heat soak into the bearing housing
results in oil carbonisation and corrosion of the bearing system.

The main damage occurs to the shaft seal ring and grooves, turbine end bearing and bearing housing oil
drain cavity blockage.