TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
Page 1478 of 1563
TM 9-2815-220-24 TORQUE LIMIT TABLES 0174 00 GENERAL (Continued) F.F.F.T. Torque Method The abbreviation F.F.F.T. (Flats From Finger Tight) is occasionally used prior to the torque column in the Special Torque Table. This method is used to tighten certain fittings, hose nuts, and tube nuts when a torque wrench is not available. The F.F.F.T. value is in parentheses followed by the proper torque value. Use the torque value whenever possible and verify the F.F.F.T. value at the earliest opportunity if it is used. The following steps explain this method: 1. Verify size. 2. Install and finger tighten (approximately 30 inch-pounds, or 3.39 N•m). Make sure fastener is seated. This is the starting point for counting the flats on the nut/fitting and equals zero (0) F.F.F.T. 2. Mark flat of nut/fitting and body of mating part with one continuous line using ink-type marker. 3. Apply torque in accordance with the value stated. As an example, a tube with an outside diameter of 1/8-inch requires 2 F.F.F.T. Tighten the tube nut two flats beyond the mark. This would be equivalent to 75-110 inch-pounds (8.47-12.43 N•m) using a torque wrench. 4. Verify torque using torque wrench at earliest opportunity. TABLE 1: SPECIAL TORQUE LIMITS NOTE Use Lubriplate (item 23, WP 0173) as a thread lubricant (except when noted otherwise). Avoid excessive amounts of lubricant in blind tapped holes. DESCRIPTION Torque: inch-pounds Accessory cam drive inner gear shaft (1-7/8-18 plug) 1300-1400 Accessory drive gear to crankshaft (7/16-20 bolts) 400-450 Accessory drive housing and fan tower to bases (3/8-24 nuts) 275-300 Accessory drive housing fan tower base to crankcase (3/8-24 nut and screws) 275-300 Camshaft drive bevel gear and oil return cover to camshaft (3/8-24 bolts) 275-325 Clamps, E-type hose (all) (Lubrication Note number 4 applies) 30-40 WP 0174 00-2