10.4.6. Periodical checking and servicing
Make it a rule to check the turbocharger assembly for condition and contamination periodi-
cally.
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 contin-
uously, 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
taps, etc.
(1) Rotor axial play
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