ATTENTION: When carrying out installation work, especially in the engine compartment due to its dense layout, the following instructions must be observed. Highways of all types (e.g. fuel, hydraulic, activated carbon absorber, cooling system, air conditioning circuit, brake system, vacuum), as well as electrical wires, must be laid as they were originally laid. Sufficient space must be ensured when working with all moving or heated parts. To avoid accident and/or damage to the injection and pre-glow system, the following points must be observed. Disconnection and connection of the electrical cables of the injection and glow system, as well as measuring instruments, is only allowed when the starter and instrument switch is off. Disconnection and connection of the battery terminals should be carried out only with the ignition off, because. Otherwise, the diesel direct injection system control unit may be damaged.
System Diagram
ATTENTION: Instructions and rules for maintaining cleanliness must be observed before and during work. If parts/components of the fuel system between the tank and the injection pump have been removed or replaced, the fuel system must be primed to remove air (operation in dry friction mode is unacceptable).
- 1 - Fuel tank with fuel priming pump -G6-
- 2 - Fuel filter with preheating valve
- 3 - Additional fuel pump -V393-
- 4 - Strainer
- 5 - Fuel temperature sender -G81 -
- 6 - injection pump, after replacement it is necessary to fill with fuel (to prevent dry running)
- 7 - Do not remove fuel metering valve -N290-
- 8 - Fuel pressure regulator -N276-
- 9 - High pressure accumulator (fuel rail)
- 10 - Fuel pressure sender -G247-
- 11 - Pressure reducing valve. The task of the pressure reducing valve is to maintain a residual pressure in the fuel return line always around 10 bar. This is necessary for piezo injectors for normal operation. The pressure reducing valve can only be replaced as an assembly with fuel return lines. After replacement, it is necessary to let the engine idle for about 2 minutes to remove air from the fuel system
- 12 - Injectors (piezo injectors). Cylinder 1 injector -N30-. Nozzle for cylinder 2 -N31-. Nozzle for cylinder 3 -N32-. Nozzle for 4th cylinder -N33-
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