TM 5-3805-280-24-2
Fuel System
35
If nozzle fails to chatter or spray properly, disassemble,
66
clean and recondition as outlined later in this group.
Fuel Injection Nozzle Tip--Specification
Spray Angle ......................................................................................... 144
LEAKAGE TEST
1. Check nozzle for fuel leakage past valve seat by
positioning nozzle on nozzle tester with nozzle tip
down.
2. Operate pump handle rapidly to firmly seat valve. Wipe
the nozzle tip dry with a clean, lint-free cloth.
3. Slowly raise pressure at nozzle to about 2800--3500
kPa (28--35 bar) (400--500 psi) under specified
opening pressure and hold at that pressure. Watch for
an accumulation of fuel around the nozzle tip orifices.
If fuel drips from nozzle within 5 seconds, nozzle must
be lapped.
Nozzle Valve/Seat Tightness Condition at Pressure Test of 2800--
3500 kPa (28--35 bar) (400--500 psi)--Specification
Leakage ..................................................... Nozzle tip dry after 5 seconds.
(Slight dampness permissible on
used nozzles.)
VALVE STEM AND GUIDE WEAR TEST
1. Position nozzle with tip slightly above the horizontal
plane.
CAUTION: Completely enclose spray zone in a
glass beaker to avoid possible personal injury
from spray.
2. Slowly raise pressure to 10 300 kPa (103 bar) (1500
psi) on test gauge
Continued on next page
RG,35,JW7592
1920NOV975/6
13-445
