TM 5-3895-373-34
2.18
REPLACE/REPAIR FUEL INJECTORS AND LINES - Continued.
C.
TEST.
I.
FUEL INJECTOR PRESSURE AND SPRAY TEST.
a.
Mount fuel injector on test stand from fuel injector
test set.
NOTE
Used fuel injectors should open between
3674 to 3792 psi (25 33 1 to 26 142
kPa). If a new nozzle assembly or
spring is installed in a used fuel injector,
the opening pressure will increase by 73
psi (507 kPa). New fuel injectors, or
used fuel injectors with both a new
nozzle assembly and a new spring,
should open between 3821 to 3939 psi
(26 345 to 27 155 kPa).
b.
Perform testing procedures to ensure fuel
injector nozzle opens within required pressure
range. Used fuel injectors should open between
3674 to 3792 psi (25 331 to 26 142 kPa). New
fuel injectors should open between 3821 to 3939
psi (26 345 to 27 155 kPa).
c.
The four sprays should be of equal length and
without
distortion
or
visible
streaks
of
unvaporized fuel.
2.
ADJUST FUEL INJECTOR.
a.
Disassemble fuel
injector
per
steps
B.1.a
through B.1.c.
b.
Add shims to increase pressure or remove
shims to decrease pressure at which fuel injector
opens.
c.
Assemble fuel injector per steps B.4.a through
B.4.c.
d.
Test fuel injector per steps C.1.a through C.1.c.
e.
Repeat step C.2 procedures until fuel injector
meets setting pressure requirements.
GO TO NEXT PAGE
2-244
