TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 CRANKSHAFT MAIN BEARINGS INSPECTION 0138 00 INSPECTION (Continued) 1. Visually inspect used main bearing halves (1, 2, 3, and 4) to the following table. If any bearing is questionable, replace it. Basis for Bearing Rejection Acceptable Bearing Flaws Separation of bearing metal, or signs of possible separation. Fine scratches on bearing surface. Pitting or any other form of destruction to bearing surface. Minute pieces of metal and dirt particles embedded in bearing surface with a concentration of less than 5 percent. (Do not attempt to remove such particles.) Raised metal at edges of scratches. Pieces of metal or dirt particles embedded in bearing surface with a concentration of 5 percent or more of the surface area. 2. Measure outside width (A) of main thrust bearing (1, 2) using micrometer (item 17, WP 0176). Replace bearings that do not meet the following limits: Point of Measurement Sizes and Fits of New Parts inches (mm) Wear Limits A (Outside width of main thrust bearing) 2.4860 (63.1444) 2.4880 (63.1952) 2.4840 (63.0936) A 4 3 2 1 WP 0138 00-2