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) 8. Tighten main bearing cap (6,7) nuts (11). a. Make sure that nuts (11) are loose, then measure and record the height of four main bearing cap (7) studs (15) at number 4 location. Use a flat surface plate (16) and dial indicator (17) (item 65, WP 0176). 16 15 11 6,7 17 b. At number 4 main cap (7), in a crosshatch pattern, torque-tighten four slotted nuts (11) to 42 foot-pounds (57 N•m) using torque wrench (item 127, WP 0176). Using the same crosshatch pattern, torque-tighten the same four nuts (11) to 58 foot-pounds (79 N•m). c. Using a flat surface plate (16) and dial indicator (17) (item 65, WP 0176), measure and record the height of four main bearing cap studs (15) at number 4 location. Subtract the first reading from the second, this is the stud stretch. d. Tighten nuts (11) to attain a stretch of 0.019 to 0.024 inch (0.4826 to 0.6096 mm). e. Any stud that exceeds the maximum stretch (0.024 inch, or 0.6096 mm) prior to the nut obtaining minimum torque (58 foot-pounds, or 79 N•m) must be replaced. f. Any stud that its nut reaches maximum torque (69 foot-pounds, or 94 N•m) prior to obtaining minimum stretch (0.019 inch, or 0.4826 mm) may be loosened and tried again. Loosening of a single nut is not allowed; all nuts on that bearing cap must be loosened. If the condition exists after the second try, the stud must be replaced. g. Repeat for remaining caps in the following order: 3, 5, 2, 6, 1, and 7. WP 0138 00-7