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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 963 (Fuel System (Diesel - General & Service Information - CPNB - 2 Of 2)) >> 23 Diesel Fuel Injection >> Fuel Injectors/High Pressure Reservoir (Rail) >> Overview - Fuel Injectors

Overview - Fuel Injectors

WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

Danger of malfunction caused by dirt.

  • Observe.
Fig 1: Fuel Injectors Exploded View
GWWA23-10488Courtesy of AUDI OF AMERICA, LLC
  1. Bracket
    • Various Tightening specifications
      • 2.5 Nm on camshaft bearing
      • 9 Nm on cylinder head
      • For the tension clamp
  2. Tension Clamp
    • Mark fuel injector and tension bracket with paint to each other and to the cylinder for reinstallation, when installing pay attention to the markings.
    • When exchanging (as a test), the tension clamp moves with the fuel injector
    • After troubleshooting, the tension clamp and the fuel injector are reinstalled on the original cylinder
    • The tensioning claws can be reused, when new fuel injectors are installed.
  3. Bolt
    • First tightening 6 Nm
    • Second tightening 90 degrees
    • Always replace
  4. High Pressure Line
    • 25 Nm
    • Coat the thread on the union nut with clean engine oil.
    • From high pressure pump to fuel rail
    • Do not change the shape of the line
    • Check for damage before installing
    • Installing. Refer to HIGH PRESSURE LINES, REMOVING AND INSTALLING .
  5. Clamp
    • For the high pressure line
  6. Bolt
    • 9 Nm
  7. Clamp
    • For the high pressure line
  8. Bolt
    • 9 Nm
  9. High Pressure Line
    • 25 Nm
    • Coat the thread on the union nut with clean engine oil.
    • From the opposite fuel rail
    • Do not change the shape of the line
    • Check for damage before installing
    • Installing. Refer to HIGH PRESSURE LINES, REMOVING AND INSTALLING .
  10. Fuel Rail
  11. Fuel Return Hose
    • To the fuel tank
  12. Fuel Return Hose
    • Always replace completely along with the restrictor
    • From the fuel injectors
    • Do not disassemble
    • After replacing the engine, allow engine to idle for 2 minutes to bleed the fuel system.
    • Check the fuel return hoses for leaks.
  13. Hose Connection Ring
  14. Banjo Bolt
    • 25 Nm
  15. O-ring
    • Always replace
  16. Fuel Pressure Regulator Valve -N276-
    • With biting edge for sealing
    • Cannot be used again
    • Perform an adaptation after replacing the high pressure pump and / or the Fuel Pressure Regulator Valve -N276-. Use a Vehicle Diagnostic Tester
    • Removing and installing. Refer to Fuel Pressure Regulator Valve -N276-, REMOVING AND INSTALLING .
    • Tightening specification. .
  17. Bolt
    • 22 Nm
  18. High Pressure Line
    • 25 Nm
    • Coat the thread on the union nut with clean engine oil.
    • From fuel rail to fuel injector
    • Do not change the shape of the line
    • Mark the part allocations for reinstallation and follow them when installing
    • Check for damage before installing
    • Installing. Refer to HIGH PRESSURE LINES, REMOVING AND INSTALLING .
  19. Fuel Return Hose
    • Always replace completely along with the restrictor
    • From the fuel injectors
    • Do not disassemble
    • After replacing the engine, allow engine to idle for 2 minutes to bleed the fuel system.
    • Check the fuel return hoses for leaks.
  20. O-ring
    • Always replace
  21. Injector
    • Mark fuel injector and tension bracket and high pressure lines with paint to each other and to the cylinder for reinstallation, when installing pay attention to the markings.
    • Always replace the copper ring seal during every assembly/disassembly procedure.
    • When exchanging (as a test), the tension clamp moves with the fuel injector
    • After troubleshooting (exchange), the fuel injector and tension clamp are reinstalled on the original cylinder.
    • To remove rust particles on the fuel injector sealing surface, clean the fuel injector shaft in the cylinder head using the Cleaning Set :VAS6811  (always clean in the event of leaks).
    • Removing and installing. Refer to FUEL INJECTORS, REMOVING AND INSTALLING .
  22. O-ring
    • Always replace
  23. Copper Gasket
    • Always replace the copper gasket during every assembly/disassembly procedure.
    • Copper gasket without bevel, does not have installation position
    • Copper gasket with bevel, note the installation position.
GWWA23-11072Courtesy of AUDI OF AMERICA, LLC
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