BMW 7 Series: Removing And Installing/Replacing Left Rail (N63)

WARNING: Electric fuel pump starts up automatically when door is opened!

Observe warning on cylinder head cover.

Carry out installation work on fuel system only with coolant temperature below 40ºC.

IMPORTANT: Wear full face guard and protective gloves.

Fuel can emerge spontaneously at high speed when the high pressure line is released!

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.

Introduced dirt contamination 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.

Recycling

Fuel escapes when fuel line is detached. Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Necessary preliminary work

• Read out the fault memory of the DME control unit. If necessary, work through test schedules.
• Switch off ignition.
• Remove left INTERCOOLER.
• Remove COOLANT EXPANSION TANK.
• Remove WATER VALVE and set the coolant hoses onto the side.
• Partially remove WIRING HARNESS for engine.
• Partially remove WIRING HARNESS for injectors and ignition coils.
• Disconnect all PRESSURE LINES on left side.
• If installed:
  Remove OIL RESERVOIR for hydraulic steering or dynamic drive.
• If installed:
  Remove suction line for hydraulic steering or dynamic drive.

Unlock plug (1) on high-pressure sensor and disconnect.

Unfasten screws (2).

Tightening torque 13 53 1AZ.

Remove rail (3).

Fig. 85: Identifying High Pressure Sensor With Plug And Mounting Screws

NOTE: Assemble engine Check fuel system for leak tightness.

Delete fault memory.

REMOVING AND INSTALLING/REPLACING RIGHT RAIL (N63)

WARNING: Electric fuel pump starts up automatically when door is opened! Observe warning on cylinder head cover.

Carry out installation work on fuel system only with coolant temperature below 40ºC.

IMPORTANT: Wear full face guard and protective gloves.

Fuel can emerge spontaneously at high speed when the high pressure line is released!

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.

Introduced dirt contamination 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.

Recycling

Fuel escapes when fuel line is detached. Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Necessary preliminary work

• Read out the fault memory of the DME control unit. If necessary, work through test schedules.
• Switch off ignition.
• Remove right INTERCOOLER.
• Remove ELECTRONICS BOX.
• Partially remove WIRING HARNESS for engine.
• Partially remove WIRING HARNESS for injectors and ignition coils.
• Disconnect all PRESSURE LINES on right.

Unlock plugs from high-pressure fuel sensor with a long screwdriver.

Fig. 86: Unlocking High-Pressure Fuel Sensor Plugs Using Long Screwdriver

Disconnect plug (1) from high-pressure sensor.

Unfasten screws (2).

Tightening torque 13 53 1AZ.

Remove rail (3).

Fig. 87: Identifying Fuel Rail With High-Pressure Sensor Plug And Mounting Screws

NOTE: Assemble engine Check fuel system for leak tightness.

Delete fault memory.

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