TM 10-3930-669-20 4-2.  INJECTOR REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Wrench, Torque (0 to 175 lb-ft [0-237 N•m]) (Item 2, Appendix B) Wrench, 20 mm (Item 2, Appendix B) Cloth, Lint-Free (Item 6, Appendix C) Fuel Oil, Diesel (Item 9, Appendix C) Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) Cab positioned for service (Para 15-2) Fuel pipes removed (Para 4-5) a. Removal WARNING •    Fuel is very flammable and can explode easily.  To avoid serious injury or death, keep fuel away from open fire and keep fire extinguisher within easy reach when working with fuel. Do not work on fuel system when engine is hot.  Fuel can be ignited by hot engine.  When working with fuel, post signs that read NO SMOKING WITHIN 50 FEET (15 m). •    Injector nozzle pressure is 1,784 psi (12,301 kPa) and can penetrate deeply into the flesh. Injury or death to personnel could result. NOTE All four injectors are removed the same way.  No.  2 injector is shown removed. (1) Loosen cap screw (1) on injector (2). (2) Remove injector (2) from cylinder head (3). (3) Remove heat shield (4) from cylinder head (3). 4-2