ENGINE SYSTEMS
72
21) Injection pump
Specification
Engine Model Part Code No. Manufacturer and Injection Pump Type
S753
131017710 094500 – 7410
S773
Disassembly, Inspection and Reassembly
(1) Disassembly, inspection, and reassembly of injection pump. If the trouble has been verified to be in the injection
pump, do not disassemble other than at shop specializing in this operation.
22) Nozzle and holder
Specifications
Part code
131406440
Nozzle type Throttle type
Ass’y No.
093500 – 3320
Needle valve dia.
∅6
Pintle dia.
∅1
Valve opening
pressure
11.27 – 12.25 MPa
(115 – 125 kg/cm
2
)
Nozzle holder
093100 – 3320 (ND-KCA46SD332)
Adjustment pressure
12.25 – 12.74 MPa
(125 – 130 kg/cm
2
)
Nozzle
093400 1460 (ND-DN4SDND146)
Injection angle
4°
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.
T149
50
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