Shibaura ST330, Workshop Manual

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50
21) Nozzle and holder
Specifications
Model
N843 (ST330/333)
Model
N843 (ST330/333)
Part code No.
131406360
Needle valve dia.
φ 4
Ass’y No.
105148 - 1170
Pintle dia. φ 1
Valve opening
14.7 MPa
{150 kgf/cm
2
}
Nozzle holder
105078 - 0100
Injection angle
4°
Nozzle
105007 – 1170 (NP-DN4PDN117)
Nozzle type
Throttle type
Structure and functions
The nozzle is finished super-precisely to inject the fuel,
which is fed from the injection pump under pressure to the
combustion room in good condition. Components as shown
in the right figure are incorporated.
The fuel is fed under pressure from the oil hole of the
nozzle holder main body to the nozzle body. When the
pressure exceeds the specified value, it pushes the spring,
injected from the nozzle, and at the same time lubricates
and cools the nozzle and nozzle body.
The oil leaking at this time is returned to the tank by the
return pipe.
148Y
149Y