33
21) Nozzle and holder
Specifications
Model
J843 (CM284) N843L (CM364)
Model
J843 (CM284) N843 (CM364)
Part code No.
131406440 131406360
Needle valve dia.
φ4
Ass’y No.
105148 – 1210 105148 - 1170
Pintle dia.
φ1
Valve opening
11.76 MPa
{120 kgf/cm
2
}
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.
053X
054X
Disassembly and inspection
(1) Place the nozzle holder (body) in a vice and disassemble turning the nozzle nut.
NOTE: Take care not to allow the needle valve to drop when removing the nozzle.
(2) Wash the nozzle and needle valve and check for seizure and sticking of the nozzle and fuel leakage on the seat surface.
Correct fuel leakage of the seat by lapping.
(3) Check the distance piece upper and lower contact areas and correct to be stuck closely.
(4) Check the push rod for wear on the nozzle needle valve contact surface and check the spring seat for crack.
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