13 53 192 Removing and Installing/Replacing A High-Pressure Line

13 53 192 - Removing and installing or replacing a high-pressure line (N54, N53)





Special tools required:





Warning!
Observe warning on cylinder head cover.

Clamp off battery negative terminal 61 20 900 Disconnecting and Connecting 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.





Warning!
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.
- High-pressure lines may be rescrewed a maximum of 10 times.





Necessary preliminary tasks:
- Remove ignition coil Service and Repair of corresponding cylinder

Note:
- Ignition coils must not be fouled by fuel!
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail! Cloths/rags must therefore be used to prevent fuel from getting into the spark plug slots!
- Before installing ignition coils, clean spark plug slots with compressed air.
- Make sure the spark plug slot is absolutely clean.





Recycling:
Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.





Warning!
Wear full face guard and protective gloves.

Fuel can emerge spontaneously at high velocity from the fuel injectors!

To reduce the fuel pressure, place rag over fuel injector and carefully tap against the fuel injector with a spanner.

There is a risk of injury if the fuel pressure is not reduced!





Note:
The following description applies to all pressure lines.

First release rail pressure lines to reduce existing fuel pressure if necessary. Fuel must not get into the spark plug slot. Then release pressure line on injector.

Release nuts (1), gripping the injector with a wrench (2) in so doing.

Disconnect pressure line (3).

Important!
If several pressure lines are removed, ensure that each pressure line is reinstalled in its original location (cylinder).

Mark pressure lines.





Close off injector with protective cap (1).

Protective caps are available from BMW Parts Service.

Seal high-pressure rail with a matching plug from special tool kit 32 1 270.





Seal pressure line (1) with a matching plug from special tool kit 32 1 270.





Installing pressure line:

Installation of pressure rail is described separately from removal.

Same procedure for all pressure lines.

Copper seals that may be fitted (1) are no longer needed and must be removed.

If using the pressure line, apply a light coating of gear oil to the thread. New pressure lines are already coated.





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 position" in the following two work steps.





Only if 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 if necessary.
- Tighten nuts on pressure line hand-tight.

Important!
Do not under any circumstances pull injector out of bore!

If the injector is pulled out of the bore hole, the PTFE sealing ring must be replaced!





Tighten down screw for holding-down element (1).

Tightening torque 13 53 5AZ 13 53 Fuel Injection Nozzles and Lines.





Adhere to tightening sequence:

- First tighten down nut (1) on injector.
- Then tighten down nut (2) on high-pressure rail.
When tightening nut (1) on injector, grip hexagon head of injector with wrench (3).

Tighten down nuts with special tool 37 1 151.

Tightening torque 13 53 8AZ 13 53 Fuel Injection Nozzles and Lines.





Assemble engine.

Check fuel system for leaks.

Check function of DME.