Home > Parts and Service > Know your Turbocharger > Failure Diagnosis > Over Heating

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.

	Causes:
	• Blocked air cleaner/excessive intake restriction.
	• Hot shutdown of engine.
	• Degraded oil quality carbonising in service.
	• Infrequent oil change intervals causing oil breakdown in service
	• Air and gas leaks.
	• Faulty fuel injector pump/injectors.

	Optional Features
	Bearing damage due to hot shutdown   Carbon build-up on shaft