5.4.8. Periodic inspection and maintenance The turbocharger assembly must be inspected periodically. 1) Revolving state and inspection points of rotor Inspection on the revolving state of rotor is performed according to abnormal noises. In case of using an acoustic bar, touch the turbocharger housing with a tip of bar and raise the engine revolution slowly, Then, in case that high sound is heard by every 2 ~ 3 sec. continuously, for there should be the possibility to be abnormal metal and rotor, replace or repair the turbocharger. 2) End play inspecting points of rotor Disassemble the turbocharger from the engine and should inspect the end plays in axial and circumference direction.
In case of disassembling the turbocharger, the oil inlet and outlet should necessarily be sealed with a tape. a) Axial direction end play z Wear limit : 0.20 mm Turbine wheel room Magnet vise Shift the turbine shaft to axial direction. Dial gauge Wear limit : 0.20 mm EFM3004I b) Rotor’s circumference direction end play z Wear limit : 0.65 mm Dial indicator Magnetic stand Oil outlet Move turbine shaft at both right and left sides simultaneously in radial direction. Oil inlet EFM3005I c) In case that the end plays to axial and circumference directions, replace or repair the turbocharger. Maintenance of Major Components - 137 -