6.4.6. 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 turbocharg- er 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 마그네트 바이스 터빈차실 Magnetic vise Turbine wheel chamber 터빈축을 축 방향 으로 이동시킨다. Move the turbine shaft in axial direction Dial gauge 다이얼 게이지 Standard : 0.117 ~ 0.20 mm Limit of werar : 0.24 mm 정비기준 : 0.117~0.20mm 마모한도 : 0.24mm EA8M4003 EA8M4003 (2) Rotor radial play 다이얼 게이지 Dial gauge 마그네트 바이스 Magnetic vise 오일 출구 Oil outlet Radial play Standard : 0.075 ~ 0.11 mm Limit of wear : 0.12 mm 원주방향 유격 정비기준 : 0.075~0.11mm 마모한도 :
0.12mm Move the turbine shaft in both direction simultaneousty 터빈축을 좌,우 동시에 원주방향으로 움직인다. 오일 입구 Oil inlet EA8M4004 (3) If the measured axial and radial plays are beyond the limit of wear, replace or repair the turbocharger. - 166 - MAINTENANCE OF MAJOR COMPONENTS