Overview - Piezoelectric Fuel Injectors And High Pressure Line

Fig 1: Identifying Injectors And High Pressure Line Overview

Courtesy of AUDI OF AMERICA, LLC

1. Copper Ring
   • Replace
2. O-ring
   • Replace
3. Injector
   • Mark fuel injector and high pressure lines with paint to each other and to the cylinder for reinstallation, when installing pay attention to the markings.
   • Replace the copper ring seal during every assembly/disassembly procedure.
   • To remove rust particles on the fuel injector sealing surface, clean the fuel injector shaft in the cylinder head using the Cleaning SetVAS6811 (always clean in the event of leaks).
   • Removing and installing. Refer to PIEZOELECTRIC FUEL INJECTORS, REMOVING AND INSTALLING .
4. Hex Shoulder Nut
   • 10 Nm
   • For the tension clamp
5. High-Pressure Lines
   • Pay attention to cleanliness
   • Do not change the shape of the line
   • Removing and installing. Refer to HIGH PRESSURE LINES, INSTALLING .
6. Fuel Rail
   • The Fuel Pressure Regulator Valve -N276- is bolted into the cylinder bank 1 fuel rail.
   • The Fuel Pressure Sensor -G247- is bolted into the cylinder bank 2 fuel rail.
7. Seals
   • Replace
8. Banjo Bolt
   • 25 Nm
9. Distribution Piece
10. High Pressure Line
    • 25 Nm
    • From the high pressure pump
    • Pay attention to cleanliness
    • Do not change the shape of the line
11. High Pressure Line
    • 25 Nm
    • From the opposite fuel rail
    • Pay attention to cleanliness
    • Do not change the shape of the line
12. Bolt
    • 22 Nm
13. Fuel Return Lines
    • Do not disassemble the fuel return lines. Replace them completely with the pressure retention valve.
    • Bleed the fuel system after replacing. Refer to FUEL TANK, FILLING WITH FUEL AFTER INSTALLING HIGH PRESSURE PUMP 
14. O-Ring
    • Replace
15. Bolt
    • 5 Nm
    • Injector unit cover to cylinder head cover
16. Tension Clamp
    • Replace