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 PISTONS, RINGS, AND ASSOCIATED PARTS REPLACE/REPAIR 0142 00 INSPECTION (Continued) NOTE 4 A If dye inspection kit (item 35, WP 0176) is available, use of that inspection method to check for cracks is preferred. 2. Inspect piston (4) for cracks, flaws or distortion. a. Use a magnifying glass and a strong light. Small cracks will show under the light as irregular or dark streaks. Replace piston if any cracks are found. b. Inspect piston (4) for damage or broken ring lands. Replace piston if damage or broken lands are found. 3. Measure the inside diameter of piston pin bore (A). Replace pistons (4) that do not meet the following limits. Location Sizes and Fits of New Parts - inches (mm) Wear Limits A (Inside diameter of piston pin bore) 2.1268 (54.0207) 2.1270 (54.0258) 2.1280 (54.0512) B 4. Check the top (tapered) ring groove by one of two methods. a. Top groove (B) may be checked with gauge (item 51, WP 0176). (1) Insert gauge in top groove. (2) If the shoulder of the gauge touches the ring land, the piston must be discarded. b. Top groove may also be checked by measuring over two 0.11547-inch (2.932938-mm) diameter roll pins. Replace pistons that do not meet the following limits. Location Sizes and Fits of New Parts - inches (mm) Wear Limits STD 0.0100 oversize 0.0200 oversize 0.0300 oversize 0.0400 oversize 5.7140 (145.1356) 5.7240 (145.3896) 5.7340 (145.6436) 5.7440 (145.8976) 5.7540 (146.1516) 5.7240 (145.3896) 5.7340 (145.6436) 5.7440 (145.8976) 5.7540 (146.1516) 5.7640 (146.4056) 5.7040 (144.8816) 5.7140 (145.1356) 5.7240 (145.3896) 5.7340 (145.6436) 5.7440 (145.8976) WP 0142 00-6