13 53 158 Removing and installing/replacing high-pressure rail (N54)

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Observe warning on cylinder head cover.

Disconnect BATTERY NEGATIVE LEAD (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.

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.

IMPORTANT: When working on the oil, coolant or fuel circuit, you must protect the alternator against contamination.

Cover alternator with suitable materials.

Failure to comply with this procedure may result in an alternator malfunction.

Necessary preliminary tasks

Remove PRESSURE LINES
Remove INTAKE FILTER HOUSING

Recycling

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

Unlock plug (1) and remove.

Pull connector holder off high-pressure rail.

Remove all holders for wiring harness from high-pressure rail.

Fig 1: Identifying Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Unlock and disconnect plug (2) on high-pressure sensor.

Release screws (3) and remove high-pressure rail (4).

Fig 2: Identifying Nut, Plug, High-Pressure Rail And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installing high-pressure rail

Installation of high-pressure rail is described separately from removal.

Install high-pressure rail (4); in so doing, tighten screws (3) and nut (1) hand-tight only.

NOTE:

It must still be possible for the high-pressure rail to slide on the cylinder head.
Nut (2) must be able to be screwed on easily by hand.

Fig 3: Identifying Nut, Screws And High Pressure Rail

Courtesy of BMW OF NORTH AMERICA, INC.

Push on plug for high-pressure sensor (2).

Fitting pressure lines

(Same procedure for all pressure lines)

Connect pressure line (1). Tightening nuts hand-tight only.

Fig 4: Identifying Pressure Line

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Connect pressure line (1) without tension only.

To ensure distortion-free installation of the pressure line and to avoid damaging the thread, it must be possible for both nuts to be screwed on easily by hand!

If the nuts cannot be easily screwed on by hand, the injector must be turned into the installation position.

NOTE: Description of "Turning injector into installation location" in the following work step.

Only if one injector has to be turned into installation position

Release bolt a few turns until holding-down element (1) is slackened.
Turn injector (2) in direction of arrow until nuts on pressure line can be easily screwed on by hand.
To do so, engage wrench on hexagon head of injector (2) if necessary.

Fig 5: Turning Injector With Nuts On Pressure Line