ATTENTION: The instructions and rules for maintaining cleanliness must be followed before and during work. To prevent the high-pressure fuel pump from running in dry friction mode and to quickly start the engine after replacing parts, be sure to perform the following work. When removing or replacing fuel system units and components located between the tank and the high-pressure fuel pump, bleed the system by performing the basic setting "Checking the fuel pump". When removing or replacing the fuel pump, fuel lines or fuel filter, perform the basic setting "Checking the fuel pump" once before starting the engine. When removing or replacing the high-pressure fuel pump, perform the basic setting "Checking the fuel pump" three times before starting the engine.
- 1 - 10 Nm
- 2 - High pressure line, 25 Nm, between the fuel injection pump and the pressure accumulator (fuel rail)
- 3 - Return fuel lines with pressure reducing valve, take into account different design groups
- 4 - 10 Nm
- 5 - Injector lines, 25 Nm, between the pressure accumulator (fuel rail) and nozzles. High-pressure lines can be reused after the following checks: check the sealing cone of the respective line for deformations and cracks. The hole must not be deformed, dirty or damaged. Corroded lines must not be used again, must not be interchanged, must not be installed without stress
- 6 - Fuel pressure regulator "N₂76", 80 Nm, check
- 7 - High pressure accumulator (fuel rail)
- 8 - Fuel supply line
- 9 - Fuel injection pump
- 10 - 20 Nm
- 11 - Fuel pressure sensor "G247", 100 Nm
- 12 - 22 Nm
- 13 - Pressure plate, replace, observe installation position
- 14 - 10 Nm
- 15 - Nozzle cover
- 16 - 5 Nm
- 17 - Nozzle (piezo injector). The following components and gaskets or O-rings must be replaced each time they are removed and installed: "Copper washer" "Injector seat sealing ring" "Injector return O-ring". When installing a new injector, the following parts and seals or O-rings must be replaced: "Pressure plate", "Copper washer", "Injector well sealing ring" "Injector return line sealing ring". Re-installed injectors must be installed only in the same place (cylinder). Before re-using the "HP injection line", visually inspect the sealing cones for damage, such as transverse scoring, corrosion, and replace if necessary
Mounting position of the pressure plate
Different return fuel lines
- -A-, without ribbing: use a clamp to connect the oil bypass line
- -B-, with ribbing: DO NOT use clamp to connect oil bypass line
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