13 51 017 Removing and installing/replacing high pressure pump (N20)

WARNING: This page is about a different variant/trim than selected.

WARNING:

Observe warning on cylinder head cover.

Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short-circuiting 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.

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!

Necessary preliminary work:

Remove ACOUSTIC COVER
Remove IGNITION COILS .
Remove the PRESSURE LINE between rail and high pressure pump.
IMPORTANT: The pressure line must be replaced. The removed pressure line cannot be re-used!
Release FEED LINE at high pressure pump, do not remove.

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Unlock connector (1) and remove.

Unfasten screws (2).

IMPORTANT: Pump plunger can fall out when high-pressure pump (3) is pulled out!

Lift out high pressure pump (3).

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

Fig 1: Identifying High Pressure Pump Connector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Before installing the high pressure pump, the cam of the high pressure pump drive must be turned to BDC . To do this, twist the engine if necessary in the direction of engine rotation to the central bolt of the crankshaft.

Lay depth gauge (1) flat on fuel pump flange.

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

Fig 2: Checking Depth Gauge Flat On Fuel Pump Flange

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace gasket (1).

Clean contact surfaces at high pressure pump.

Fig 3: Identifying High Pressure Pump Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Install high pressure pump (3).

Replace screws (2). Screws (2) are coated with sealing compound.

Installation note:

IMPORTANT: Provisionally fasten screws (2) of the high pressure pump (3) and tighten alternately in 90° increments until final torque. Piston can otherwise break due to tilting!

Fig 4: Identifying High Pressure Pump Connector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 13 51 1AZ .

Connect connector (1).

Installation note:

Refit sound insulation (1) at the high pressure pump.

Fig 5: Identifying High Pressure Pump Sound Insulation

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check fuel system for tightness.

Check function of DME.