TM  5-2815-241-34&P FUEL INJECTOR - CONTINUED ACTION LOCATION ITEM REMARKS ASSEMBLY  -  CONTINUED 19. Barrel (1) 20. 21. Injector  adapter  (3) 22. Injector  adapter  (3) and  barrel  (1) 23. Injector  adapter  (3) Check  ball  (2) Place check ball into top of barrel, in check ball   seat. Injector  adapter  (3) Plunger  (4) Place injector adapter onto top of barrel. Immerse  plunger  in  clean  injector  test oil,  and  install  into  injector  adapter without   injector   spring. Injector  cup  (5) Turn  the  injector  adapter  and  barrel  with the barrel up. Place the injector cup on the   barrel. Injector  cup  (5)  and cup  retainer  (6) Lubricate  the  injector  cup  contact  area  and the cup retainer threads with clean fuel oil. Screw down finger tight and loosen one- quarter  turn. TA 242582 2-364