13 51 065 Removing and installing/replacing left high pressure pump (N74)

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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 40 °C.

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 lines or separate components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.

IMPORTANT: Ignition coils must not be contaminated 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 the HIGH PRESSURE LINE from the high pressure pump on the left toward the 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!

Slightly slacken screws (1) of high pressure pump (3). If the high pressure pump is forced out, the engine will have to be turned to bring the camshafts to a different position.

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

Fig 1: Identifying High Pressure Pump, Connector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Place depth gauge (1) flat on fuel pump flange (see arrow in illustration) (shown on N43 engine).

Fig 2: Measuring Fuel Pump Flange Using Depth Gauge

Courtesy of BMW OF NORTH AMERICA, INC.

Turn engine at central bolt in direction of engine rotation until the depth gauge shows that the camshaft has reached the BDC position.

Fig 3: Locating Camshaft At BDC Position

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

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

Unlock connector (3) and remove.

Fig 4: Identifying High Pressure Pump, Connector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Pump plunger can fall out when high-pressure pump (3) 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 90° increments until final tightening.

Tightening torque: see 1AZ in 13 51 INJECTION PUMP, CONTROL

Installation note:

Replace sealing ring (1).

Clean contact surfaces.

Fig 5: Identifying High Pressure Pump Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check fuel system for tightness.

Check function of DME.