TM 55-1520-240-23-5 6-18 INSTALL NO. 2 THRU NO. 6 FORWARD DRIVE SHAFT     (Continued) 6-18 14. Coat two adapter assembly bolts (4) with oil (E254).  Install bolts, special washers (3), and nuts (2). 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. 15. Hold head of bolts (4) with wrench.  Check nuts for friction torque of at least  24 inch-pounds. 16. Torque nuts to  1000-1100 inch-pounds. INSPECT FOLLOW-ON MAINTENANCE: Inspect forward drive shaft (Task 6-10). Check rotary-wing blade phasing (Task 6-27.1). Close forward drive shaft tunnel access covers (Task 2-2). Install cabin tunnel smoke baffle (Task 2-170.1). Perform ground run (TM 1-1520-240-10). Perform vibration check (TM 1-6625-724-13&P). END OF TASK Change 1 6-57