Nozzle Assembly - Robin DY23-2D Service Manual

6-3 FUEL INJECTION NOZZLE
6- 3- 1 SPECIFICATfONS
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Part Name
NOZZLE ASSEMBLY
/-
Type No.
4
No.
of
nozzle hole
DLLA150PN52
(Diameter)
195 kg/
ern'
Valve opening pressure
(0.22 mm)
Spring constant 13.2 kg/ mm
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6 - 3- 2 FEATURES
Both the injection nozzle and the injection pump are very important parts for producing
fuel mist
for combustion. There are two types of injection nozzle, one is
hole type and
the other is pintle type.
The injection nozzle for DY23 and DY27 Diesel engines is developed as a result of joint
research and development project by Diesel Kiki and our company, and it is direct
combustion system, having the special hole type nozzle.
For producing better air-fuel mixture, it utilizes swirl and squish flows and deliver the
fuel mist most effectively, injection pressure is raised up to 195 kg/cm2.
6 - 3 - 3 STRUCTURE OF THE INJECTION
NOZZLE ASSEMBLY
The injection nozzle assembly consists
of nozzle holder and nozzle. The nozzle
holder fixes the nozzle to the cylinder
head and at the same time it plays the
role of fuel passage to the nozzle.
The nozzle consists of the nozzle body
and needle valve.
When the fuel pressure reaches up to the
valve opening pressure, the needle valve
is
raised up and the fuel is injected
through the small holes at the tip of the
nozzle body.
.The valve opening pressure is adjustable
by changing the adjusting washers.
IDENTIFICATION
MARK
ADJUSTING WASHER
NOZZLE SPRING
FIG. 69
NOZZLE
BODY
VALVE CLOSED VALVE OPENED
FIG. 70
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44
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