Component Overview
CAUTION:
Dirt on injection system components (intake manifold injection and direct fuel injection system)
- Material damage
- Rough-running engine
- Bad exhaust emissions
→ Thoroughly clean connection points and adjacent areas before loosening them. If the engine is very dirty, wash it before starting disassembly work.
→ Lay removed parts on a clean surface and cover them. Only use a clean, lint-free cloth.
→ Carefully cover components or seal them if repair work will not be carried out immediately. Place rubber caps on connections. Seal intake openings with film or adhesive tape.
→ Only install clean parts. Do not take spare parts out of the packaging until just before installation.
→ Never use compressed air when the system is open. Do not move the vehicle.
Information
- Always perform a leak test in the high-pressure area after opening the fuel system.
- This is particularly important if components are disassembled and replaced.
- Coat the threaded connections of the fuel lines with Microgleit DF977 lubricant (Part No. 000.043.209.35) before screwing them on again.
- Always allow a drying time of about 15 minutes for the lubricant!
- Blow residual fuel out of the lines and high-pressure pump into a fuel-resistant container or cloth using compressed air (1 bar) before installation.
- The tightening specifications must be strictly observed.
Overview of fuel system in engine compartment:
Component overview of fuel system on high-pressure side
| 1 | High-pressure pump |
| 2 | O-ring on high-pressure pump |
| 3 | External Torx screw, M6 x 20 - replace screws > Tightening torque 13 Nm (9.5 ftlb.) -3- |
| 4 | Low-pressure line |
| 5 | Holder for fuel lines |
| 6 | M6 screw for holder for fuel lines> Tightening torque 13 Nm (9.5 ftlb.) -6- |
| 7 | Fuel collection pipe, bank 4-6 |
| 8 | Screw, M8 x 80> Initial tightening 10 Nm (7.5 ftlb.) -8- > Final tightening torque angle + 90° -8- |
| 9 | Fuel collection pipe, bank 1-3 |
| 10 | Low-pressure connection |
| 11 | Union nut for fuel line - coat with Microgleit DF977 > Initial tightening 8 Nm (6 ftlb.) -11- > Final tightening torque angle + 50° + 10° -11- |
| 12 | Low-pressure sensor> Tightening torque 25 Nm (19 ftlb.) -12- |
| 13 | High-pressure sensor for cylinder bank 4-6> Tightening torque 37.5 Nm (27.5 ftlb.) +/- 2 Nm (1.5 ftlb.) -13- |
| 14 | High-pressure sensor for cylinder bank 1-3> Tightening torque 37.5 Nm (27.5 ftlb.) +/- 2 Nm (1.5 ftlb.) -14- |