Kohler KDI Series

31
2
_07
5
4 3
1 2
Fig. 2.9
ED0053029590
TECHNICAL INFORMATION
2.9.5 Common rail
Fuel is injected under pressure into the Common Rail (Pos.
3), from the high-pressure fuel injection pump.
- The internal volume of the Common Rail is optimised to obtain
the best compromise in order to minimise pressure peaks
due to the cyclical ow of the injection pump;
- opening the electronic injectors;
- the high speed response of the system to the requests of
the ECU control unit.
The pressure sensor 5 measures the pressure of the fuel in
the Common Rail.
Safety valve 2, only opens if internal pressure of the Common
Rail exceeds the maximum value of 2400 bar.
Pressure inside the Common Rail is regulated by the high-
pressure fuel injection pump by means of the fuel intake
regulation valve (Pos. 6 Fig. 2.6).
POS. DESCRIPTION
1 Common Rail
2 Pressure limit valve (return due to overpressure)
3 Tube inlet union from high-pressure fuel injection
pump
4 Outlet ttings for supply pipes to electronic
injectors
5 Fuel pressure sensor
Important
• Common Rail is NOT repairable.
• It is NOT possible to perform any maintenance on the fuel
pressure sensor 5, as it is an integral part of the Common
Rail unit.
• Do NOT remove the pressure sensor or the fuel pressure limit
valve from the Common Rail.
• If the pressure sensor or the pressure limit valve are not
working, replace the entire Common Rail unit.
Tab. 2.15