9-2b. ARMY TM  5-6115-612-34 MARINE CORPS TM 6115-34/8 AIR  FORCE TO  35C2-3-471-2 hex is NAVY AG-320BO-MME-OOO Section III. GENERAL MAINTENANCE 2-4. GENERAL MAINTENANCE FOR DIRECT (3) Install lockwasher and SUPPORT, GENERAL SUPPORT AND DEPOT. nut. Tighten  nut  until  lockwasher This section provides general mainte- flattened. nance procedures for replacing lockbolts, gasket material, sound abatement material, and turnlock c. Gasket Replacement. fasteners. WARNING a. Lockbolt   Removal/Ins tallation. To prevent injury, use cleaning (1) Center punch head of lockbolt fluid in a well-ventilated area. pin. Avoid prolonged  or repeated breathing  of  vapor,  and  prolonged (2) Use 3/16 inch drill bit and or repeated contact with skin. carefully drill into head of lockbolt Use  proper  protective  equipment. pin. (1) Remove damaged gasket. (3) When Use drill bit is trichlorethylene (O-T-634) to thor- approximately 2/3 of the way into the oughly  clean  area. lockbolt pin, the  lockbolt  pin  should destruct. It  may  be  necessary  to (2) Measure and cut new gasket to lightly  tap  out  lockbolt  collar. fit. (4)   Ensure   that   hole   is   not (3) Peel backing from  adhesive damaged. Remove any burrs. side of new gasket and firmly press in place. Trim to fit. (5) Install new lockbolt pin in hole. d. Insulation Replacement. Pro- (6) Place new collar on lockbolt cedures  for  replacing  engine  housing pin. insulation are identical to those for gasket replacement except that the (7) Use a pneumatic puller with a edges of the insulation material must 3/16 inch nose adapter. Pull on collar be treated with edge sealer before side of lockbolt pin until pin breaks installing. Replacement  of exhaust off even with collar. duct insulation is covered in paragraph b. Lockbolt Replacement. Lockbolts can be replaced with a screw, washers, Turnlock  Faste ner  Replacement. and nut. This arrangement can be (See figure 2-1.) either  temporary  or  permanent. (1)  Receptacle  replacement. (1) Remove lockbolt in accordance with paragraph 2-4a, steps (1) through (a) Hold receptacle with screw (4). driver. (2)  Place  flat  washer  on  #10 (b) Loosen and remove retaining hexhead screw and insert in hole. nut. 2-55