TM  55-2840-241-23 (2)  Remove  bolts  (9)  and  nuts  (6)  securing clamps  (7  and  8)  together. (3)  Remove  bolt  (14)  and  nut  (16)  securing clamp (17) to bracket (15). (4) Remove two bolts (10 and 11) and nuts (12) securing the lead to the fireshield. Remove the lead. NOTE Bolt (10) also secures the accumulator bracket and spacer to the fireshield. b.  Inspection. (1) Inspect the outer part of the lead for braid damage;  replace  lead  if  there  are  more  than  five  broken strands in any localized area, the braided conduit is punctured, or discolored and brittle from extreme heat. (2} Inspect terminals of lead to ensure all parts are intact and no pitting is evident; replace lead if any part is missing or pitting is present. c.  Installation (1) Insert the igniter lead (18) through the hold in the fireshield. Secure the lead to the fireshield with bolt  (11)  and  nut  (12).  Secure  accumulator  clamp, spacer, and igniter lead with bolt (10) and nut (12). Tighten the nuts to 35-40 in. lb. (2)  Connect  the  igniter  lead  to  the  ignition exciter (3) and tighten the coupling nut to 50-70 in. lb. (3) Connect the igniter lead to the spark igniter (19) and tighten the coupling nut to 70-90 in. lb. (4)  Secure  the  lead  to  the  air  tubing  at  the power turbine governor with four clamps ( 7 and 8), two bolts (9) and nuts (6). Tighten the nuts to 35-40 in. lb. (5) Secure the igniter lead to bracket (15) with clamp  (17),  bolt  (14)  and  nut  (16).  Tighten  the  nut  to 35-40  in.  lb. d. Ignition System Check.  The  following  procedure can be used to check the operation of the ignition sys- tem. NOTE To preclude the possibility of the combustion chamber  becoming  misalined,  do  not  remove  the fuel nozzle and the spark igniter at the same time. (1) Remove the spark igniter lead (18) from spark igniter. (2) Remove the spark igniter (19). To  prevent  damage  to  the  igniter,  when assembling  or  disassembling  a  lead  and an  igniter  which  is  not  installed  on  the engine, turn the lead nut and not the spark igniter. the (3) Attach the spark igniter lead to the spark igniter. (4)  Apply  28  volts  dc  across  the  ignition  exciter. Observe or listen for spark. (5) Install spark igniter and spark igniter lead on the engine. Tighten the spark igniter to 150-200 in. lb. and lockwire to the fuel nozzle. Tighten the lead to 70-90  in.  lb. Section   VI.   MISCELLANEOUS   ACCESSORIES 5-38. Burner Drain Valve. a.  Removal. NOTE Use a wrench on the drain valve boss to offset torque when removing or installing the valve. (1) Remove lockwire and remove nut ( 16, figure 3-8) from the drain valve (14). Disengage bracket (15) and remove the drain valve from the outer combustion case.  Discard  preformed  packing  (13). (2)  Flush  the  valve  with  petroleum  solvent (item 3, table 2-2). Pass solvent through the valve to ensure that it is open. (3) Blow dry with clean compressed air. c.  Testing. Test the valve to ensure that it closes by applying air pressure (8 psig maximum) to the valve inlet or test as described  in  paragraph  5-38 d (2). b. Cleaning. d.  Installation. (1) Soak the valve in solvent (item 16, table 2-2). (1) Lubricate new preformed packing (13) with oil (item 7 or 8, table 2-2) and place on drain valve (14). Install the drain valve in the outer combustion case 5-28  Change  14