Chapter 3 Fuel Injection Equipment
7. Fuel Injection Nozzle
4LHA Seriei
7-6.2
Injection
test
After adjusting the nozzle to the specified starting
pressure,
check the fuel spray condition and seat oil
tightness.
(1) Checking the seat oil tightness
After two or three injections, gradually increase
the pressure up to 1.96 (20)
MPa
(kgf/cm). Before
reading the starting pressure, maintain the pressure
for 5 seconds and make sure
that
no oil is dripping
from
the tip of the nozzle.
Test
the injection
with
a nozzle tester, retighten
and
test again if there is excessive oil leakage
from
the overflow coupling.
Replace
the nozzle as a set if oil leakage is still ex-
cessive.
(2)
Injection
spray condition
Operate
the nozzle tester lever once or twice a
second
and check for abnormal injection.
1) Hole type nozzles
Replace hole type nozzles that do not satisfy the
following conditions:
. Proper spray angle {8)
• Correct injection angle (a)
• Complete atomization of fuel
• Prompt starting/stopping of injection
Spray
from
each
nozzle
hole is uniform
Poor
.TL
•
Excessive
difference
in
spray
angle (9)
•
Excessive
difference
in injection angle (a)
• Incomplete atomization
•Sluggish
starting/stopping
of injection
3-2-47
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