13 53 205 Removing and installing/replacing left rail (S63)

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WARNING: Electric fuel pump starts up automatically when door is opened!
Observe warning on cylinder head cover.
Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit on removal).
Carry out installation work on fuel system only with coolant temperature below 40 °C.

IMPORTANT: 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 carrying out repair work 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 contamination before removing lines or separate components.
Use only lint-free cloths.
Seal all fuel system openings with protective caps or plugs.

IMPORTANT: Screw back on all screw points of cable channels without fail! Some screw points are also ground points. If the wiring harnesses are not correctly screwed tight and secured, this may cause DME malfunction and failure!

Recycling

Fuel escapes when fuel line is detached. Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Necessary preliminary tasks:

Read out the fault memory of the DME control unit. If necessary, work through test plans.
Switch off ignition.
Remove left UPPER SECTION OF INTAKE FILTER HOUSING .
Release OIL RESERVOIR for hydraulic steering and place to one side.
Release CONTROL UNITS FOR CYLINDERS 5-8 and place to one side.
Remove IGNITION COILS FOR CYLINDERS 5-8 .

Unlock and pull off connector from high-pressure sensor on rail.

Unlock and pull off connector from injectors.

Release screws (1).

Tightening torque 12 51 1AZ .

Loosen wiring harnesses (2) from cylinder head cover and place to one side.

IMPORTANT: Screw back on all screw points of cable channels without fail. Some screw points are also ground points .

Fig 1: Identifying Wiring Harnesses And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Loosen nuts (1) on injectors.

Loosen nut (2) on high pressure pump.

Release screws (3).

Remove rail.

Fig 2: Identifying Pump Connector, Screws And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Bending the lines on the rail (3) is not allowed.

Failure to comply with this results in risk of leak on rail (3).

First insert the rail at the pump connector (2), then lower to the point where the ball heads are positioned inside the injector cones and the rail is correctly positioned.

Then tighten the nuts (1) on the injectors so they are hand-tight. Next, hand-tighten the nut (2) of the high pressure pump. Lastly, mount screws (3) and hand-tighten.

Follow the correct screw connection sequence.

Fig 3: Identifying Pump Connector, Screws And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Apply hand tightening force to screws (3) on rail.
Tightening torque 13 53 1AZ .
Tighten nuts (1) on the injectors.
Tightening torque 13 53 2AZ .
Apply tightening force to nut (2) on high pressure pump.
Tightening torque 13 53 3AZ .

NOTE: Assemble engine.

Check fuel system for tightness.

Clear diagnostic fault entries from fault memory.