TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
Page 164 of 779
b. Removal. Refer to Table 4-7 for figure references and instructions pertinent to the removal of the fuel injector nozzle and holder assembly. c. Testing. Note. Before installing injector nozzle on nozzle tester, thoroughly clean external area to remove carbon and dirt. Do not allow dirt to enter nozzle fuel inlet opening. For nozzles that do not perform properly on nozzle tester refer to paragraph 4-18 for disassembly sequence and necessary procedures ‘required to assure a properly functioning nozzle and holder assembly. (1) Nozzle installation. Mount the fuel injector nozzle and holder assembly on the fuel injector nozzle tester using nozzle attaching tube -4910-795-7953. The tube should be connected to the lower connection on the injector nozzle tester. Close the pressure gage valve and actuate the pump handle rapidly (approximately 2S strokes per minute) to expel air from nozzle and holder and to settle spring and nozzle holding column. (2) Nozzle opening pressure. Fill reservoir with sufficient fuel to perform test. Open pressure gage valve and actuate tester slowly to raise pressure. When nozzle opens, gage pressure must be between 3050 psi (minimum), 3150 psi (maximum). If this gage reading is not achieved, nozzle and holder assembly must be disassembled and spring adjusting spacers (fig. 4-167) added or removed to obtain the proper pressure reading. Figure 4-167. Fuel injector nozzle and holder assembly—sectional view. . 4-82