13 53 192 Removing and Installing/Replacing A Pressure Line
13 53 192 Removing And Installing/Replacing A Pressure Line (N55)
Special tools required:
WARNING:
Observe warning on cylinder head cover.
Disconnect negative battery terminal (risk of fire due to short circuit on dismantling).
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 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 contamination before removing lines or separate components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.
- High pressure lines may be re-screwed a maximum of 10 times.
Necessary preliminary tasks:
- Remove ignition coil 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. It is therefore essential to protect the spark plug slot against ingress of fuel with a cloth.
- 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 disconnect the pressure lines from the rail. To reduce existing fuel pressure if necessary. Fuel must not get into the spark plug slot. Then disconnect the pressure line from the injector.
Unscrew nuts (1).
Disconnect pressure line (2).
Installation note:
Reinstall line damper (3).
IMPORTANT:
If several pressure lines are removed, ensure that each pressure line is reinstalled in its original location (cylinder).
Mark pressure lines.
Seal rail and injector with a matching plug (1) from special tool kit 132 1 270.
Seal pressure line (1) with a matching plug from special tool kit 232 1 270.
Installing pressure line:
Installation of pressure line 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 reusing the pressure line, apply a light coating of transmission 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.
Connect pressure line (1) and hand tighten nuts (2) only.
Installation note:
Reinstall line damper (3).
Adhere to tightening sequence:
- First tighten down nut (1) on injector.
- Then tighten down nut (2) on rail.
Tighten down nuts with special tool 313 0 161.
Tightening torque 13 53 9AZ.
NOTE: Reset special tool in good time to prevent bending of pressure lines.
Assemble engine.
Check fuel system for tightness.
Check function of DME.
E � �K� :
