4.4.6. Periodical checking and servicing
Make it a rule to check the turbocharger assembly for condition and contamination periodically.
1) Guide for checking the rotor for rotating condition
The inspection of the rotor assembly for rotating condition should be performed by the degree
of unusual sound. If a sound detecting bar is used, install its tip on the turbocharger housing and
increase the engine revolutions slowly. If a high-pitch sound is heard continuously, it means that
the rotor assembly is not normal. In this case, as the metal bearing and rotor are likely to be in
abnormal conditions, the turbocharger should be replaced or repaired.
2) Guide for checking rotor end play
Disassemble the turbocharger from the engine, then check the rotor axial play and radial play.
When disassembling the turbocharger, be sure to plug the oil inlet and outlet ports with tape, etc.
(1) Rotor axial play
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