TM 9-2320-289-34
3-36.
FUEL INJECTOR NOZZLE TESTING (Con’t).
d.
CHATTER TEST
1. Close shutoff lever at pressure gage.
NOTE
“Chatter” from new and used fuel injector nozzles (3) will vary. When
speed of lever movement is increased, fuel injector nozzle may “hiss” or
“squeal”
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.
2.
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
nozzle
“chatters. ”
Replace fuel
injector
nozzle
if
it
does
not
“chatter,” “hiss, ” or “squeal. ”
FOLLOW-ON TASKS:
l Install fuel injector nozzle, (See paragraph 3-27)
TA50716
3-118
