Maintenance of Major Components
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5.5.6. 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 taps, etc.
a) Rotor axial play
b) Rotor radial play
c) If the measured axial and radial plays are beyond the limit of wear, replace or repair the
turbocharger.
EA8M4003
Magnetic vise
Turbine wheel chamber
Dial gauge
Move the turbine
shaft in axial
direction
Standard : 0.117 ~ 0.20mm
Limit of werar : 0.24mm
ED4OM048
Move the turbine shaft
in both direction
simultaneousty
Magnetic vise
Dial gauge
Oil outlet
Oil inlet
Radial play
standard : 0.075~0.11mm
Limit of wear : 0.12mm
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