TM 9-4940-568-34
5-88
5-16. FUEL INJECTOR REPLACEMENT (CONT).
(2)
Spray pattern check:
(a)
Open valve.
(b)
Operate lever at one stroke per
second.
(c)
When nozzle opens you should see a
well atomized spray pattern.
(3)
Leakage test:
(a)
Open valve.
(b)
Operate lever to hold pressure 20 bar
(290 psi) below opening pressure of
220 bar (3,191 psi).
(c)
No drops should fall from the tip
within 10 seconds.
(4)
Chatter test:
NOTE
The chatter test indicates the
ability of the needle valve to
move freely and correctly
atomize the fuel.
Used nozzles should not be
evaluated for chatter at lower
speeds. A used nozzle can
generally be used if it passes the
leakage test, chatters audibly at
high lever speeds and uniformly
atomizes the fuel.
(a)
Close on\off valve.
(b)
Open pump isolator valve.
(c)
Operate lever rapidly.
(d)
Listen for the audible chatter of the
valve opening.
