Figure 4-167. Fuel injector nozzle and holder assembly--sectional view.

-4910-795-7953. The tube should be connected

b. Removal. Refer to Table 4-7 for figure

to the lower connection on the injector nozzle

references and instructions pertinent to the

tester. Close the pressure gage valve and actuate

removal of the fuel injector nozzle and holder

the pump handle rapidly (approximately 2S

assembly.

strokes per minute) to expel air from nozzle and

c. Testing.

holder and to settle spring and nozzle holding

Note. Before installing injector nozzle on

column.

nozzle tester, thoroughly clean external area to

remove carbon and dirt. Do not allow dirt to

(2) Nozzle opening pressure. Fill reservoir

with sufficient fuel to perform test. Open

enter nozzle fuel inlet opening. For nozzles that

pressure gage valve and actuate tester slowly to

do not perform properly on nozzle tester refer to

raise pressure. When nozzle opens, gage pressure

paragraph 4-18 for disassembly sequence and

must be between 3050 psi (minimum), 3150 psi

necessary procedures `required to assure a

properly functioning nozzle and holder

(maximum). If this gage reading is not achieved,

nozzle a n d h o l d e r a s s e m b l y m u s t b e

assembly.

disassembled and spring adjusting spacers (fig.

(1) Nozzle installation. Mount the fuel

4-167) added or removed to obtain the proper

injector nozzle and holder assembly on the fuel

pressure reading.

injector nozzle tester using nozzle attaching tube

Figure 4-167. Fuel injector nozzle and holder assembly--sectional view.

4-82