TM 9-2320-361-34 3-3. CYLINDER HEAD MAINTENANCE (Contd) WARNING Ensure engine compartment is free of all tools and working materials before starting engine. Failure to do this may result in damage to equipment and injury to personnel. 12. Start engine (TM 9-2320-36 1-10). Idle engine until coolant temperature reaches a minimum of 175°F (79C) before engine shutdown. 13. Remove no. 1 through no. 3 injector tubes (para. 5-3). 14. Remove rocker arm cover and gasket (para. 3-6). 15. Remove rocker arm assembly (para. 3-7). WARNING Hand protection must be worn during nut retightening. Engine surface is hot and can cause injury to personnel. CAUTION ● ● All nuts must rotate during tightening recheck. Failure of nut(s) to rotate may result in improper torque setting, cylinder head warpage, and gasket failure. During nuts tightening recheck, engine coolant temperature must remain 170F (77C) or above to maintain cylinder head expansion. Tightening of nuts when coolant is below 170F (77°C) may result in cylinder head warpage and gasket failure. NOTE If studs rotate when torquing nuts, remove cylinder head (task a) and repair or replace studs (para. 2-10). 16. Tighten fourteen nuts (1) to 130 lb-ft (176 N.m) in torque sequence shown. 3-8