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Reasons for the turbo damage


Impact damage caused by foreign material entering the turbine housing or compressor housing is clearly visible on the turbine wheel or impeller. Never continue to operate a turbocharger with damaged blades as the rotor balance will be affected and this could impact its service life.


Insufficient oil supply can be attributed to the following:

Re-fitting a turbocharger without adequate priming

Long periods of non-use

Broken or restricted

oil feed pipe

Low engine oil pressure due to malfunctioning lubrication system

Low or no oil in sump

The use of sealants, which can restrict oil flow

Not priming a replacement oil filter with new oil. If this cannot be done then crank the engine with no fuel to establish oil pressure


Dirty oil damages the turbocharger by causing heavy scoring of critical bearing surfaces.
To avoid damage, oil and filters should be of a quality recommended by the engine manufacturer. These should be changed when a new turbocharger is fitted and at regular intervals according to the vehicle/engine manufacturers specification.

Dirty oil damage could result from:

Blocked, damaged or

poor quality oil filter

Dirt introduced during servicing

Engine wear or

manufacturing debris

Malfunctioning oil filter

by-pass valve

Degraded lubrication oil


Failure from excessive exhaust temperatures or hot shutdown of engine results in carbon build-up. It is recommended that you idle the engine for two to three 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.

Carbon build-up can be caused by:

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


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