13 53 158 Removing and installing or replacing high-pressure rail (N14)

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

WARNING: Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to short-circuiting on removal).
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 velocity 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.

Necessary preliminary tasks:

Remove INTAKE PLENUM
Remove PRESSURE LINE

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

NOTE: For purposes of clarity, illustration shows and description refers to the removed high-pressure rail.
Disconnect plug connections (1) of fuel injectors (2).

Fig 1: Identifying Plug Connections And Fuel Injectors

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection (1) for high-pressure sensor.

Detach wiring harness (2) from high-pressure rail (3).

Release screws.

Tightening torque 13 53 3AZ

Detach high-pressure rail (3) from cylinder head and remove.

Fig 2: Detaching High-Pressure Rail From Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Refer to the procedure for installing FUEL INJECTOR if a fuel injector (2) detached from the cylinder head (4) while removing the high-pressure rail
Replace retainer (1)
Replace seal (6) and support ring (5), making sure support ring (5) is seated correctly
Make sure guide pin (3) of fuel injector (2) is correctly positioned in designated hole in cylinder head (4)

Fig 3: Identifying Retainer, Guide Pin, Fuel Injector, Seal And Support Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check fuel system for LEAKS .

Check function of DME.