ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 Warning Diesel  fuel  Is  flammable  and  toxic  to  eyes,  skin,  and  respiratory  tract.    Skin/eye  protection required.  Avoid repeated/prolonged  contact.  Good general ventilation Is normally adequate. b. Drain all fuel from system, including fuel transfer pump, fuel injection pump, and fuel filter into suitable container. c. Securely plug off end of fuel return line. CAUTION Maximum air pressure should be 15 psi (103 kPa) when performing this test d. Using a low pressure air source, pressurize the fuel system at the fuel supply line. e. Apply liquid soap and water solution to all joints and connections in the fuel system and inspect for leaks. NOTE Connections may allow air to enter the system without allowing fuel to leak out f.    If any leaks are found, take necessary steps to repair. g. Reconnect supply and return lines and prime system. h. Start engine and run for approximately 10 minutes. i. Allow engine to sit for eight hours or overnight, then try starting engine. Section IX.  CYLINDER HEAD ASSEMBLY MAINTENANCE 3-31.  VALVE COVER. 3-31.1.  Removal. a. Remove eight bolts (1, FIGURE 3-94) securing valve cover (2); remove valve cover (2) and gasket (3).  Discard gasket (3). b. Remove preformed packing (4).  Discard packing (4). 3-31.2.  Installation. NOTE Install gasket (3, FIGURE 3-94) dry (no sealant). a. Position  new  gasket  (3,  FIGURE  3-94)  and  valve  cover  (2)  on  cylinder  head  and  secure  with  eight  bolts  (1). Tighten bolts to 7 ft-lbs (11 Nm). b. Install new preformed packing (4) in valve cover. 3-129