FUEL INJECTOR NOZZLE AND HOLDER REPAIR -- CONTINUED
Test -- Continued
c. If spray pattern is not acceptable, disassemble, clean and flush each nozzle hole thoroughly. Reassemble
and repeat test.
d. If spray pattern is still not acceptable, and does not improve with continued operation of the tester, replace
nozzle tip. Perform this work package and repeat test.
8. Check nozzle seat leakage.
a. Disconnect metal tube assembly (14) from lower connector (15) and move to upper connector (20).
b. Dry the nozzle tip with a cloth.
c. Open pressure gauge valve (17) and actuate tester slowly to build up pressure to 300 psi (20685 kPa) below
the valve opening pressure and hold for five (5) seconds.
d. If drops of fuel form at spray orifices, or if fuel issues as a stream at 300 psi (2068.5 kPa) below the valve
opening pressure, close the pressure gauge valve (17) and actuate the pump handle (18) rapidly eight to ten
times. Repeat steps 8b and 8c. If drops form or fuel issues as a stream, the nozzle and holder (3) is leaking
and must be replaced. Perform this work package and repeat test.
9. After successful testing, remove the nozzle and holder from test stand and install protective caps and plugs.