DL06K Interim Tire-4 Diesel Engine Disassembly and Reassembly of Major Components
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7) Common rail pressure sensor
The fuel flows to the rail pressure sensor through an opening in the common rail,
the end of which is sealed off by the sensor diaphragm. Pressurized fuel
reaches the sensor’s diaphragm through a blind hole. The sensor element for
converting the pressure to an electric signal is mounted on this diaphragm. The
signal generated by the sensor is inputted to an evaluation circuit which
amplifies the measuring signal and sends it to the ECU.
3.4.12. Pressure limiter valve
z The pressure limiter valve is at the connection end to the common rail, is closed
by the cone shaped end of the plunger valve against inside of the valve body. At
normal operating pressures (1,800 bar), a spring forces the plunger against the
seat and the common rail remains closed.
z As soon as the operating pressure is exceeded, the plunger is forced by the rail
pressure against the force of the spring, the fuel pressure is maintained with the
normal pressure, and the escape fuel return to the fuel tank through the return pipe.
EE1OM099
Electric connections
Evaluation circuit
Diaphragm
High pressure
connection
Mounting thread
EE1OM100
Valve
Plunger
Valve body Valve spring
Common rail
Fuel
return
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