ТОПЛИВНАЯ СИСТЕМА


  1. CONSTRUCTION


    1. The function of the common-rail assembly is to store the fuel that has been pressurized by the supply pump. The common-rail assembly is provided with a fuel pressure sensor that detects the fuel pressure in the common-rail, and a pressure discharge valve which regulates the fuel pressure.

    2. Internally, the common-rail assembly contains a main hole and 5 branch holes that intersect the main hole. Each branch hole functions as an orifice that dampens the fluctuation of the fuel pressure.

    3. In the pressure discharge valve, the plunger opens and closes in accordance with the actuation signals from the injector driver. Thus, the pressure discharge valve regulates pressure by releasing excess pressure from the common-rail assembly. In addition, the pressure discharge valve has a pressure reduction function in case of emergency.

      A00YY7FE02

      Tech Tips

      Because the fuel pressure sensor uses a plastic-deformed sealing portion to ensure sealing performance, it cannot be reused after disassembling. The fuel pressure sensor and pressure discharge valve are supplied as a set with the common-rail assembly. Do not disassemble the fuel pressure sensor and pressure discharge valve. Also, if parts that affect the alignment have been changed, make sure to replace the pipe with a new one as well. The parts that require the replacement of a pipe are listed below:


      • Injection pipe: injector, common-rail, cylinder head and intake manifold

      • Fuel inlet pipe: supply pump, common-rail, cylinder head and intake manifold

      For details, refer to the Repair Manual.