Component Tests and General Diagnostics

Turbocharger

Component Tests

Turbocharger Internal Oil Leak Test

NOTE: Some engine oil may be present in the turbocharger compressor inlet and in the air inlet components due to the crankcase breather system.

Check the turbocharger compressor inlet for evidence of oil. If excessive oil is present, this indicates that the failure could be in the engine or turbocharger. Refer to Engine System - General Information Testing and Inspection or the following turbocharger check. If excessive oil is found in the turbocharger compressor outlet, check the Charge Air Cooler (CAC) for oil contamination. If contamination is present, flush the CAC. Refer to Intake Air Distribution and Filtering Procedures.

Check the turbocharger turbine outlet for evidence of oil. If excess oil is present in the outlet, remove the turbocharger from the engine and examine the oil supply and return passages in the turbocharger and engine block for restriction. If no restriction is found, install a new turbocharger.

Check for Free Rotation - Off Vehicle

NOTE: Pre-oil the turbocharger before carrying out this check.

NOTE: Turbine and compressor wheels must spin freely when turned by hand. No housing contact is permitted.

Inspect the turbocharger compressor and turbine blades for damage. If the compressor or turbine wheel blades are damaged, replace the turbocharger.

Press and rotate the turbocharger shaft, then repeat from the opposite side. If either the compressor or the turbine wheel blades contact the housing, the bearings are worn or damaged and a new turbocharger must be installed.