TM-9-2990-206-34&P Parts Manual, Tools and Maintenance for Turbocharger Model T18C01 Download
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INSPECTION-Continued. INSPECT SHROUD 1. Inspect shroud (A) for cracks, nicks, and raised metal. 2. Inspect mating flange for distortion. Inspect flat face of shroud for evidence of rubbing or scoring from the turbine wheel. 3. Replace damaged shroud. INSPECT TURBINE WHEEL TOOLS: 0.00 to 1.00 inch micrometer 0.0015 to O.025 inch blade thickness gage (feeler) Vernier calipers 1. 2. 3. 4. 5. 6. CAUTION Cracked turbine wheel blades will break during operation and cause failure. Inspect turbine wheel (B) for cracked, broken, bent, eroded, or missing blades. Inspect shaft for cracks, scratches, or scoring. Inspect bearing journals and threads for damage. Inspect rear surface of turbine wheel for evidence of wear or scoring. Inspect seal ring groove (C) for wear. Inspect blade tips for feather-edge or tears. Measure blade tips (D) with micrometer. Replace turbine wheel if damaged, or if blade thickness is less than 0.025 inch (0.635 mm). Measure seal ring groove (C) width and diameter using thickness gage and vernier calipers. Replace turbine wheel if groove width exceeds 0.0685 inch (1.7399mm) or groove diameter is less than 0.8600 inch (21.84 mm). Measure shaft bearing journals (E) using micrometer. Replace turbine wheel if diameters are less than 0.6250 inch (15.875 mm). Measure shaft hub diameter (F) using micrometer. Replace turbine wheel if diameter is less than 0.9950 inch (25.273 mm). TA097821 3-15 TM 9-2990-206-34&P