13 53 170 Replacing All Pressure Lines

13 53 170 Removing And Installing/Replacing All Pressure Lines (N63)

Special tools required:







WARNING:
Electric fuel pump starts up automatically when door is opened.
Disconnect negative battery terminal (risk of fire due to short-circuiting on removal).
Observe warning on cylinder head cover.

WARNING:
Carry out installation work on fuel system only with coolant temperature below 40 °C.
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 dirt contamination 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 32 1 270.
- High pressure lines may be re-screwed a maximum of 10 times.







Recycling:
Fuel escapes when fuel lines are detached.
Catch and dispose of escaping fuel in a suitable collecting vessel.
Observe country-specific waste disposal regulations.







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.

Necessary preliminary work:
- Remove ignition coils.
- Remove charge air cooler on left and right.
- Partially remove wiring harness for engine.
- Partially remove wiring harness for injectors.
- Detach positive battery cable from positive battery connection point, partially remove positive battery cable
- Remove coolant expansion tank.
- Remove electronics box.
- Remove water valve for heater/air conditioner and lay coolant hoses to one side.
- Detach tank vent line from tank venting valve and point of separation.
- Remove suspension cross-braces on left and right.
- Remove sound insulation for bulkhead on left and right
- Draw off A/C system.
- If fitted:
Remove oil reservoir for hydraulic steering or dynamic drive.

- If fitted:
Remove vacuum line for hydraulic steering or dynamic drive.







Release screw (1).
Tightening torque 64 53 3AZ.
Detach A/C line (2) and place to one side.
Replace sealing ring on A/C line.







Slacken nut (1).
Tightening torque 12 42 7AZ.
Remove positive battery cable (2) and place to one side.







Disconnect fuel delivery line. Seal fuel lines with special tools (1) 13 5 160 and (2) 13 5 162.
Catch and dispose of escaping fuel.







Remove pressure line from injector to rail.

NOTE:
The following description applies to all pressure lines.
First disconnect the pressure line 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.

Release union nuts (1).
Disconnect pressure line (2).
Set down pressure lines in order.







Secure injector against twisting with spanner (2).
Release union nut (1).

IMPORTANT:
If several pressure lines are removed, ensure that each pressure line is reinstalled in its original installation location (cylinder).
Mark pressure lines.







Installation note:
Only if injector has to be rotated in fitted position:
- Release bolt a few turns until holding-down device (3) is slackened.
- Turn injector (1) in direction of arrow until union nuts (2) on pressure line can be easily screwed on by hand.
- To do so, engage spanner on hexagon head of injector if necessary.
- Tighten union nuts on pressure line hand-tight.

IMPORTANT:
Do not under any circumstances pull injector out of bore hole.
If the injector is pulled out of the bore hole, the PTFE sealing ring must be replaced. Replacing PTFE sealing ring, refer to 13 53 315.







Adhere to tightening sequence:
- First tighten down union nut on injector.
- Then tighten down union nut on rail.

Tighten pressure lines with special tool 13 0 160.
Tighten pressure line on injector with torque wrench (2) and special tool (1) 13 0 161. In so doing, grip hexagon head of injector with spanner (3).
Tighten union nuts with special tool (1) 13 0 161.
Tightening torque 13 53 2AZ.







For cylinders 4 and 8, tighten pressure line (1) with torque (2) and crowfoot wrench (3). In so doing, grip hexagon head of injector with spanner.
Tightening torque 13 53 2AZ.







Tighten down pressure line on rail with torque wrench (1) and special tools (2) 00 1 440, (3) 13 0 162 and (4) 13 0 161.
Tightening torque 13 53 2AZ.

Installation note:
When tightening the pressure line on the rail, ensure that the angle of rotation of special tool 13 0 161 is restricted. Reapply the special tool if necessary.
Distortion of torque possible.







Remove high pressure line from high pressure pump to rail.
Picture shows left side. Procedure on right side identical.
Release union nuts (1).
Disconnect pressure line (2).







Refit high pressure line from high pressure pump to rail.
Tighten down pressure line (1) hand-tight on rail and injector.
First tighten high-pressure line (1) on high-pressure pump using torque wrench (2) and special tool (3) 00 1 440.
Tightening torque 13 53 3AZ.







Installation note:
When tightening the pressure line on the rail, ensure that the angle of rotation of special tool 13 0 140 is restricted. Reapply the special tool if necessary.







Tighten high-pressure line (1) on rail using torque wrench (2), long crowfoot spanner (3) and special tool (4) 13 0 140.
Tightening torque 13 53 3AZ.







Assemble engine.
Bleed fuel system with BMW diagnosis system.
Check fuel system for tightness.
Check function of DME.