TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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b. Inspect piston (9, fig. 3-183) r cracks, flaws or distortion. Use a magnifying gJass and a strong light. Smail cracks will show under the light as irregular or dark streaks. Inspect the top (tapered) ring groove using piston ring gage, part number 12254296 (fig. 3-183. I). Inserl gage in top groove. If the shoulder of the gage touches the ring land, the piston must be discarded. If the piston ring gage is not available, the top groove may be checked by measuring over pins and the measurement checked against limits specified in repair standards (table 3-1 I). Check the second, third, and fourth ring grooves against limits specified in repair standards (table 3-11 ). Inspect piston for damage or broken ring lands, nicks, burs, or scratches. Inspect piston pin bores for wear, cracks, or abrasions. Replace piston if unserviceable. I Nul, extended washer 2 Cap, connecting rod 3 Bearing,sleeve 4 Rod,connecting 5 Bolt, connccling rod 6 Bearing, sleeve 7 Ring, piston pin retainer TM 9-2815·220-34 8 Piston pin 9 Piston 10 Ring, piston oil control 11 Ring- piston compression 12 Ring-piston compression 13 Crankshaft connecting rod assembly F'ig11re3·1113. Pi11tu11, C'111111f'1·ti11111:m1 ui1Cl asociatecl pas- e.cp/otle<l view. Table 3·9.3. ton Weig Identiation Chart PISTON PISTON PISTON STAMP WEIGHT STAMP WEIGHT STAMP WEIGHT CODE LBS. CODE LBS. CODE LBS. 5 7.75 B 7.93 H 8.11 7.76 7.94 8.12 7.77 7.95 8.13 4 7.78 c 7.96 J 8.14 7.79 7.97 8.15 7.80 7.98 8.16 3 7.81 D 7.99 K 8. 1 7 7.82 8.00 8.18 7.83 8.01 8.19 2 7.84 E 8. 02 L 8.20 7.85 8.03 8.21 7.86 8.04 8.22 1 7.87 F 8.05 M 8.23 7.88 8.06 8.24 7.89 8.07 8.25 A 7.90 G 8.08 7.91 8.09 7.92 8.10 Change 3