FUEL INJECTOR NOZZLE TESTING (Cont).
1. Close shutoff lever at pressure gage.
Chatter from new and used fuel injector nozzles (3) will vary. When
speed of lever movement is increased, fuel injector nozzle may hiss or
rather than chatter; this Is also acceptable. Any of these
sounds indicates that needle valve (6) moves freely and that nozzle seat,
guide, and nozzle pintle (5) have no mechanical defects.
Depress lever of fuel injector nozzle
tester slowly and listen for chatter
from fuel injector nozzle (3). If no
chatter is heard, increase speed of
lever movement until fuel injector
chatter, hiss, or squeal.
l Install fuel injector nozzle, (See paragraph 3-27)