TM 55-1520-240-23-5 6-19 INSTALL NO. 7 DRIVE SHAFT     (Continued) 6-19 NOTE Special washers are installed against adapter assemblies. 2. Coat thread of six bolts (4) with oil (E254/E254.1). Install three bolts, head forward, special washers (5), washers (6), and nuts (7) at each end of shaft (1). CAUTION Do not allow bolts to turn when torquing nuts.  If bolts turn, bolts and plates can be damaged. NOTE If nuts do not meet friction torque, they must be replaced. 3. Hold head of bolts (4) with wrench.  Check nuts for friction torque of at least  24 inch-pounds. 4. Torque nuts to  1000-1100 inch-pounds. 5. Coat two adapter assembly bolts (8) with oil (E254/E254.1). Install bolts, special washers (9), and nuts (10). CAUTION Do not allow bolts to turn when torquing nuts.  If bolts turn, bolts and adapter assembly can be damaged. NOTE If nuts do not meet friction torque, they must be replaced. 6. Hold head of bolts (8) with wrench.  Check nuts for friction torque of at least  24 inch-pounds. 7. Torque nuts to  1000-1100 inch-pounds. INSPECT FOLLOW-ON MAINTENANCE: Check rotary-wing blade phasing (Task 6-27.1). Close forward drive shaft tunnel No.  6 drive shaft cover (Task 2-2). Close pylon lower fairing (Task 2-2). Close pylon hinged fairing (Task 2-2). Install cabin tunnel smoke baffle (Task 2-170.1). Perform a combining transmission oil cooler fan vibration check (TM 1-6625-724-13&P). END OF TASK 6-59