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System components High-pressure pump The 2-piston high-pressure pump is located on the lefthand side of the crankcase at the output side. The high-pressure pump compresses the fuel and generates the required rail pressure. The gear wheel of the high-pressure pump is driven by the gear drive at half of the crankshaft rpm. The torque is transferred to the shaft of the high-pressure pump via a multi-gear driver. High pressure pump 1 2 3 Return flow Quantity control valve Feed 4 5 6 Fuel temperature sensor Gear wheel Multi-gear driver i Note The high-pressure lines between the high-pressure pump, the rail and the piezo injectors may only be used once. 36 q CDI Diesel Direct Injection for OM 651, System Description – This printout will not be recorded by the update service. Status: 09 / 2008 –
