13 51 017 Removing and installing/replacing high-pressure pump (N54, N54T)
Special tools required:
Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit on removal).
Electric fuel pump starts up automatically each time door is opened!
Carry out installation work on fuel system only with coolant temperature below 40 °C.
Fuel can emerge spontaneously at high speed when the high pressure line is released!
Introduced contaminants can cause malfunctions in the system!
- Do not allow any dirt particles or foreign bodies to get into the system.
- Remove all traces of dirt contamination before removing lines or separate components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!
Cover ignition coil with suitable means.
Necessary preliminary tasks:
- Remove THROTTLE BODY
Recycling
Fuel escapes when fuel lines are detached.
Catch and dispose of escaping fuel.
Observe country-specific waste disposal regulations.
Apply silicone-free multifunction spray (part number 83 23 0 418 567) on to supports (1) of base well bracket (2).
Unplug connector (3) and (4) from base well.
Slide base well (2) in direction of arrow.
Insert special tool 00 7 300 in mounting points (1) on base well.
Detach base well (1) from bracket (2) with special tool 00 7 300 .
Unlock connector (1) and remove.
Unlock and detach fuel line (2).
Catch and dispose of escaping fuel.
Seal fuel lines with special tools 13 5 281 and 13 5 282 .
Slacken nut (1).
Release screw (2).
Installation note:
- Replace aluminum screw (2).
Remove feed line (3).
Seal feed line with matching plug from set of special tools 32 1 270 .
Slacken nut (1).
Undo screws (1) and raise acoustic cover (2) in front area.
Slacken nut (1).
Seal fuel line connections of high pressure pump (1) with matching plugs from set of special tools 32 1 270 .
Release bolts with special tool 11 8 610 .
Detach high pressure pump (1) and remove.
Engine oil can escape when pump is detached; have a cleaning cloth ready.
Installing high pressure pump
Installation of high pressure pump is described separately from removal.
Replace sealing ring (1).
Clean contact surfaces.
Replacement
For better installation, turn the journal of the new high pressure pump to the position of the old high pressure pump.
When installing, turn high pressure pump (1) if necessary in direction of arrow until bore holes for screws are flush.
This helps ensure that no strain is produced when the high pressure line is tightened.
Copper seals that may be fitted on the high pressure line are no longer needed and must be removed.
If reusing pressure line, lightly grease threads of pressure connections. Threads of new pressure lines are already coated.
Only hand-tighten nut (1).
Only hand-tighten nut (1).
Observe installation position of fuel low-pressure sensor. Lines for solenoid switches are laid behind fuel line.
Install feed line (3).
Only hand-tighten nut (1)!
Tighten screw (2). Replace aluminum screw.
Tightening torque: 13 53 9AZ .
Tighten down screws with special tool 11 8 610 .
Tightening torque: 13 51 1AZ .
Tighten nut (1).
Tightening torque: 13 53 7AZ .
Tighten down nut (1) with special tool 13 5 020 .
Tightening torque: 13 53 7AZ .
Tighten down nut (1) with special tool 13 5 020 .
Tightening torque: 13 53 6AZ .
Install and lock connector (1).
Slide base well (2) on to bracket (1) as far as it will go.
Install and lock connector (3) and (4).
Assemble engine.
Check fuel system for tightness.
Check function of DME.