BMW 7 Series: Removing And Installing/Replacing Left High Pressure Pump (N63)

WARNING: Observe warning on cylinder head cover.

Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit on removal).

Electric fuel pump starts up automatically when door is opened! 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 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 before removing pipes or individual components.
• Use only fluff-free cloths.
• Seal all fuel system openings with protective caps or plugs.

IMPORTANT: Ignition coils must not be fouled by fuel.

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 FUEL FEED LINE.
• Remove HIGH-PRESSURE LINE from left high-pressure pump to rail.

Recycling

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

IMPORTANT: High-pressure pump can be pretensioned by camshaft cams!

Slacken screws (1) of high pressure pump (2) a little. The engine must be rotated when the high pressure pump is pushed out.

Otherwise it will not be possible to install the high-pressure pump!

Fig. 32: Identifying High Pressure Pump With Mounting Screws

Rotate engine at central bolt through 90º in direction of engine rotation.

Fig. 33: [Engine Rotation Position At Central Bolt]

Release screws (1).

Replace screws (1). Screws (1) are coated with sealant.

IMPORTANT: The pump plunger can fall out when the high-pressure pump (2) is pulled out!

Detach high-pressure pump (2) and remove.

Engine oil can escape when pump is detached; have a cleaning cloth ready.

Installation note: Provisionally fasten screws (1) and tighten uniformly in 180º increments until final tightening.

Tightening torque 13 51 1AZ.

Fig. 34: Identifying High Pressure Pump With Mounting Screws

Installation note: Replace sealing ring (1).

Clean contact surfaces.

Fig. 35: Identifying High Pressure Pump Sealing Ring

Assemble engine.

Check fuel system for tightness.

Check function of DME.

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