Only if injector has to be rotated in fitted position

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Release bolt (3) a few turns until holding-down element 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 wrench on hexagon head of injector if necessary.
Tighten down union nut (2) of pressure line hand-tight.
Tighten down screw on holding-down element (3).

Fig 1: Turning Injector
Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque: see 5AZ in 13 53 FUEL INJECTION NOZZLES AND PIPES

IMPORTANT: Do not under any circumstances pull injector out of bore!
If the injector is pulled out of the bore hole, the PTFE sealing ring must be replaced! Replacing PTFE sealing ring, refer to RENEWING THE PTFE SEALING RING

Adhere to tightening sequence:

First tighten down union nut on injector.
Then tighten down union nut on rail.

Tighten high-pressure fuel lines with special tool 13 0 160 .

Fig 2: Tightening High-Pressure Fuel Line On Injector Using Torque Wrench And Special Tool 13 0 161

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten high-pressure fuel line on injector with torque wrench (2) and special tool (1) 13 0 161 . In so doing, grip hexagon head of injector with wrench (3).

Tighten union nuts with special tool (1) 13 0 161 .

Tightening torque: see 2AZ in 13 53 FUEL INJECTION NOZZLES AND PIPES

Installation:

When tightening high-pressure line on rail, note that angle of rotation of special tool 13 0 161 is limited. Re-position special tool if necessary.

Distortion of torque possible!

Assemble engine.

Vent fuel system with BMW diagnosis system.

Check fuel system for leaks.

Check function of DME.