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Chapter 3 Fuel Injection Equipment
~~~F!:.!:;ue~l~l~I1J~e~c~ti~on!!..:.N~o~z~zl~e;_ _______________________ ~4JH~BXC)E
6. Fuel Injection Nozzle
When fuel oil pumped by the fuer injection pump reach-
es the injection nozzle, it pushes up the nozzle valve (h_eld
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 welt the fuel is
mixed with high temperature air directly affects combus-
tion etficiency, engine performance and fuel economy.
Accordingly, the fuel injection nozzles must be kept in top.
condition to maintain performance and operating efficiency.
(1}
Hole type fuel injection nozzle
F.O.
return pipe joint
Applicable engine model
I.D.
mark
- - Nozzle cover mounting groove
Nozzle holder
I}-
Fuel starting pressure ad/usting shim
I---
Nozzle spring
~
Nozzle spring seat
l;)----
Stop plate
6
Nozzie valve
Positioning
pin
1i r
Nozzle
Nozzle body
0--
Nonie clamp nut
Nozzle 1.0. Mark
155P225TCO
Spray angle
150·
No. of
injection
hoteXdia
5X0.22mm
Nozzle opening prassure
215~225Kg/crn'
3-32
6-1 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 automaticatly pushed down by the
nozzle spring and dosed after fuel is injected.
Oil that leaks from between the nozzle valve and nozzle
body goes from 1he hole on top of the nozzle spring
through the oil leak.age fitting and back into the fuel tank.
Adjustment of injection starting pressure is effected wilt
the adjusting shims
Nozzle holder
Fuel starting pressure
Adjusting shim
Nozzle valve .---
Nozzle
body _,,
F.O. return pipe joint
1/
Nozzle cover
Nozzle clamp nut
Nozzle body
Injection hofe
Spray angle
Printed in Japan
HINSHI-H8009
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