13 53 158 Removing and installing/replacing high-pressure rail (N14, N18)

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

WARNING: Disconnect BATTERY NEGATIVE LEAD (risk of fire due to short circuit on dismantling).

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!

Necessary preliminary work:

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: Removing High Pressure Rail

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: Identifying Plug Connection And High Pressure Rail Wiring Harness

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

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 hold-down device (1).
Replace seal ring (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, Fuel Injector, Guide Pin, Support Ring And Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME.