13 53 330 Replacing leakage oil lines (N47 D16/20 U/K/O 1)

Necessary preliminary tasks:

Read out the fault memory of the DDE control unit.
Switch off ignition.
REMOVE rear acoustic cover and sound insulation on injector.

IMPORTANT: It is essential to adhere to conditions of absolute cleanliness when carrying out repair work on the fuel system.

Do not allow any dirt particles or foreign bodies to get into the system.
Use only lint-free cloths.
Remove all traces of dirt contamination before removing pipes or individual components.

IMPORTANT: You must protect the alternator against dirt contamination before carrying out any repair work on the fuel circuit.
Cover alternator with suitable materials.
Failure to comply with this procedure may result in an alternator malfunction.

Pull out retainer (1) upwards.

Detach connection of leakage oil line (2) upwards.

Fig 1: Pulling Retainer

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Coat sealing ring (1) with lubricant before connecting to leakage oil line at the injector.
Check sealing ring for damage, damaged sealing rings may cause malfunction during fuel pressure buildup.
The entire leakage oil line must be replaced if seal (1) is damaged.

Fig 2: Identifying Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Detach leakage oil lines from the injectors. Release leakage oil line from rubber grommet (1).

Detach leakage oil line from T-piece (2) of fuel line (close to high pressure pump).

Fig 3: Detaching Leakage Oil Line From T-Piece Of Fuel Line

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check fuel system for tightness.