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Chapter 3 Fuel Injection Equipment
12. Fuel Injection Nozzle
,
4LHA Series
12. Fuel
Injection
Nozzle
When
fuel oil pumped by the fuel injection pump reaches
the injection nozzle, it pushes up the nozzle valve (held
down by spring), and is injected
into
the combustion
chamber
at high pressure.
The
fuel is atomized by the
nozzle
to mix uniformly
with
the
air in the combustion chamber. How well the fuel is mixed
with
high temperature air directly affects combustion effi-
ciency,
engine performance and fuel economy.
Accordingly,
the fuel injection nozzles must be kept in top.
condition to maintain performance and operating efficien-
cy.
12-1
Functioning
of
fuel
injection
nozzle
Fuel
from the fuel injection pump
passes
through the oil
port
in the nozzle holder, and enters the nozzle body
reservoir.
When
oil reaches the specified pressure, it pushes up the
nozzle
valve (held by the nozzle spring), and is injected
through the small hole on the tip of the
nozzle
body.
The
nozzle valve is automatically pushed down by the
nozzle
spring and
closed
after fuel is injected.
Oil
that
leaks from between the nozzle valve and nozzle
body goes from the hole on top of the nozzle spring
through the oil
leakage
fitting
and back
into
the fuel tank.
Adjustment of injection starting pressure is effected
with
the adjusting shims.
(1) Hole type fuel injection nozzle
Applicable
engine model-
I. D. mark
F.O.
return
pipe
joint
-
Nozzle
cover mounting groove
Nozzle
holder
- Fuel starting
pressure
adjusting shim
Positioning
pin-
-
Nozzle
spring
-
Nozzle
spring seat
-Stop
plate
izzle
valve
—
Nozzle
Nozzle
holder
Fuel
starting pressure
Adjusting shim
Nozzle
spring
Nozzle
spring seat
Nozzle
valve
Nozzle
body
Hole
F.O.
reservoir
:zlebodyJ
Nozzle
clamp nut
F.O.
return
pipe
joint
Nozzle
cover
Positioning
pin
Stop
plate
Nozzle
clamp nut
Nozzle
valve
Nozzle
body
Injection
hole
Spray
angle
3-1-59
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