Daewoo DE12 Shop Manual page 143

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
EQM4063I
(2) Rotor radial play
Radial play
Standard : 0.075~0.11mm
Limit of wear : 0.12mm
Turbine wheel chamber
Magnetic vise
Dial gauge
Standard : 0.117~0.20mm
Limit of wear : 0.24mm
<Figure 4-57> Measuring rotor axial play
Dial gauge
Oil outlet
Oil inlet
<Figure 4-58> Measuring rotor radial play
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Move the turbine
shaft in axial
direction
Magnetic vice
Move the turbine shaft
in both direction
simultaneously