1 Fuel pressure sensor The fuel rail is made of forged steel. The common rail performs the following functions: • stores fuel under high pressure and • minimizes pressure fluctuations. Pressure fluctuations are induced in the high-pressure fuel system due to the operating movements in the high-pressure chambers of the high-pressure pump and the opening… Read More »
1 From high-pressure chamber annular channel 2 Zero delivery valve 3 Calibrated bore (ø = 0.4 mm) 4 To transfer pump The zero delivery valve is located between the annular channel that is connected to the inlet valves of the high-pressure chambers and the fuel metering valve. Even in the fully closed state, the fuel… Read More »
1 High pressure to fuel rail 2 Outlet valve 3 Spring 4 Fuel feed 5 Drive shaft 6 Eccentric cam 7 High-pressure chamber 8 Pump plunger 9 Inlet valve The high-pressure pump is driven via the drive shaft. An eccentric element is fixed to the drive shaft and moves the three plungers up and down… Read More »
A Low engine speeds B Increasing engine speeds C High engine speeds 1 Transfer pump pressure 2 Time 3 Compression spring 4 Orifice 5 To the high-pressure chambers 6 Control piston 7 Lubrication/cooling/ventilation – high-pressure pump 8 High-pressure pump cooling bypass 9 Return bypass to transfer pump High-pressure generation (up to 1600 bar) means high… Read More »
1 Intake side 2 Drive gear 3 Delivery side The transfer pump is designed as a gear pump and delivers the required fuel to the high-pressure pump. Essential components are two counter-rotating, meshed gear wheels that transport the fuel in the tooth gaps from the intake side to the pressure side. The contact line of… Read More »
High pressure pump CP3.2 1 Transfer pump 2 Fuel metering valve 3 Pump plunger 4 Eccentric 5 Drive shaft 6 Pump housing High pressure pump CP1H 1 Fuel metering valve 2 Fuel return port 3 Fuel supply port 4 Transfer pump 5 High pressure port (to fuel rail) Two different types of high pressure pumps… Read More »
1 Fuel injector 2 Fuel injection line 3 Leak-off pipe 4 Fuel metering valve 5 Transfer pump 6 High pressure line 7 High pressure pump 8 Fuel rail 9 Fuel pressure sensor
1 Fuel feed to the high-pressure pump 2 Water drain screw 3 Electric fuel pre-heater 4 Fuel feed from the fuel tank The fuel filter clipped into transmission end of the cylinder head is equipped with an electric fuel heater. There is a water drain screw in the top housing section of the filter for… Read More »
A Fuel feed B Outlet pipe for excess fuel delivered C High pressure line D Fuel injection line E Fuel return from high-pressure pump F Leak-off pipe G Fuel return to fuel tank 1 High pressure pump 2 Fuel rail (common rail) 3 Fuel injector 4 Fuel temperature sensor 5 Fuel return collector pipe 6… Read More »
During the regeneration phase, the intercooler bypass flap opens, enabling uncooled charge air to be directed to the combustion chambers. The uncooled air prevents cooling of the combustion chamber when engine speeds/engine loads are low and this promotes the regeneration of the diesel particulate filter. The intercooler bypass flap servo motor incorporates a DC motor… Read More »