13 53 158 Removing and refitting/replacing pressure accumulator of fuel injection system (N47 D20 O 1 with SCR)

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 ACOUSTIC COVER
Remove PRESSURE LINES to injectors.
Remove PRESSURE LINE to high pressure pump.

Recycling:

Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Unlock plug (1) from pressure regulator and detach.

Unlock return line (2) from pressure accumulator and disconnect.

Unlock connector from pressure sensor (3) and detach.

Fig 1: Identifying Pressure Accumulator Return Line And Pressure Regulator Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Remove pressure accumulator.

Fig 2: Identifying Pressure Accumulator Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assembly sequence for high-pressure fuel system:

Insert pressure accumulator.
Provisionally fasten all high pressure lines.
Clip pressure accumulator mountings and screw down.
Tighten down high pressure lines on injectors.
Tightening torque: 13 53 2AZ .
Tighten down high pressure lines on pressure accumulator.
Tightening torque: 13 53 2AZ .
Tighten down high pressure line on high pressure pump.
Tightening torque: 13 53 2AZ .

Assemble engine.

Vent fuel system via BMW diagnosis system.

Check fuel system for tightness.