13 53... Removing and installing/replacing fuel injector, N55 up to engine number 14407684 (hold-down device at bottom)

Special tools required:

IMPORTANT: Adhere to the WARNINGS ON REMOVING THE INJECTORS !

Necessary preliminary tasks:

Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit on removal).
Remove IGNITION COIL of corresponding cylinder.
Disconnect PRESSURE LINES of corresponding cylinder.

Unlock and disconnect the connectors (2) from the injectors with a small slotted screwdriver (1).

Unlock the lock in the direction of the arrow with a small slotted screwdriver (1). Disconnect the connector (2) on the connector housing from the injector.

Fig 1: Disconnecting Connectors From Injectors With Small Slotted Screwdriver

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NOTE: The following description applies to all injectors cylinder 1-6.

Slacken nut (1).

Tightening torque 12 90 5AZ .

Remove earth cable.

Unlock connector (2) from injectors and detach.

Release screw plug (3) and remove.

Fig 2: Identifying Screw Plug, Connector And Nut

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Release screws (1).

Remove the clamping plate (2) and counter support (3).

Clamping plate (2) is a disposable part and must be replaced following removal.

Remove EMC plate (4).

Fig 3: Identifying EMC Plate, Clamping Plate, Counter Support And Screws

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Release screw (1).

Feed out hold-down device (2) and remove.

Lift injectors (3) out of cylinder head and remove.

NOTE: If several injectors are removed, ensure that each injector is reinstalled in its original installation location (cylinder).

Mark injectors.

Fig 4: Identifying Hold-Down Device, Injectors And Screw

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Procedure in event of stuck injector:

Use special tool 13 0 270 to remove injectors that are stuck.

Lightly oil pull-out thread (1) and unscrew completely (see illustration) before using the special tool.

Attention!

Pull-out thread (1) is a left-hand thread!

Fig 5: Identifying Pull-Out Thread

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Fit special tool (1) 13 0 270 on injector slot. Join screws (2) to injector slot by a few threads. Screw in pull-out thread (4) until it is possible to screw the threaded sleeves (3) onto the injectors. Screw threaded sleeves (3) onto injectors and tighten down.

Tighten down screws (2).

Tightening torque 13 53 13AZ .

Fig 6: Fitting Special Tool On Injector Slot

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Attention!

Set torque wrench (1) to 5 Nm clockwise rotation. Together with special tool 13 0 270 this corresponds to a tensile force of max. 2000 N. The injector must be replaced if the torque wrench is activated when the injector is pulled out!

Fit torque wrench (1) and special tool (2) 00 9 170 on square head (3) of special tool 13 0 270 .

Turn torque wrench (1) in clockwise direction until the injector is pulled out.

Make sure that retaining pin (4) does not touch the cylinder head cover; if necessary, press the retaining pin back. Risk of damage!

Fig 7: Turning Torque Wrench Clockwise

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After removing, fit protective caps (1 and 2) to injector tip and fuel line connection.

Installation note:

When installing a new injector:

Install decoupling element (3) without fail!

Failure to comply with this requirement may result in line breaks and fuel discharge!

Fig 8: Identifying Protective Caps And Decoupling Element

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Installation note:

When reusing a running injector:

Replace decoupling element (1) without fail!
Replace Teflon ring (2) without fail!
A Teflon ring that has already been installed once in the cylinder head must be replaced before the injector is reinstalled.

Fig 9: Identifying Decoupling Element And Teflon Ring

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Failure to comply with this requirement may result in line breaks and fuel discharge!

Replace Teflon ring:

Before replacing the Teflon ring (1), make sure your hands and the support areas are clean and free of oil.

Avoid mechanical contact with injector tip (2).

Fig 10: Identifying Teflon Ring And Injector Tip

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Dismount Teflon ring (2) from injector (1) with special tool (3) 13 0 191 .

Use a fluff-free cloth only to remove combustion residues from cylindrical part of injector tip (do not use ultrasound or other tools/agents).

Do not clean injector tip.

Fig 11: Removing Teflon Ring From Injector Using Special Tool (13 0 191)

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Push new Teflon ring (1) onto installation cone (2) 13 0 283 .

Fig 12: Identifying Teflon Ring And Installation Cone

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Mount Teflon ring (1) with installation cone (2) 13 0 283 on injector tip (3).

NOTE:

Do not use fingernails to slide Teflon ring on.
Do not use any lubricating agents.
The sealing ring is expanded when slid on.

Fig 13: Identifying Teflon Ring, Injector Tip And Installation Cone

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Using special tool 13 0 281 (1), push Teflon ring into groove (3) on injector.

Fig 14: Pushing Teflon Ring Into Injector Groove Using Special Tool

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To bring the widened Teflon ring to installation dimension, special tool 13 0 282 (1) must be pushed up to the limit position at injector (2).

Do not use any lubricating agents.

Fig 15: Pushing Special Tool (13 0 282) Onto Injector

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NOTE: Pull mounting tip (1) of special tool 13 0 282 towards rear to release mounting taper (2) 13 0 281 .

Fig 16: Pulling Mounting Tip

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Installing injector:

Installation of injector is described separately from removal.

Attention!

Injection quantity compensation!

Fig 17: Identifying Injector Adjustment Value

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An injection quantity compensation must be carried out if an injector is replaced or changed on the cylinder side.

Injection quantity compensation is carried out with the aid of a so-called adjustment value.

The adjustment value is printed with three digits - depending on the version - on the injector body.

The adjustment value must be read off before installation!

Enter the adjustment value according to the installation location (cylinder) of the injector.

If injector quantity compensation is not carried out, the engine may run roughly or fail to start.

Injection quantity compensation is described at the end of these instructions.

Fig 18: Identifying Adjustment Value Printed With Three Digits On Injector Cylinder

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Installing injector:

Tighten down screws (2).

Tightening torque 13 53 13AZ .

Fig 19: Fitting Special Tool On Injector Slot

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Attention!

Set torque wrench (1) to 2 Nm counter-clockwise rotation.

Fit torque wrench (1) and special tool (2) 00 9 170 on square head (3) of special tool 13 0 270 .

Turn torque wrench (1) in counterclockwise direction until 2 Nm are reached. Make sure that retaining pin (4) does not touch the cylinder head cover; if necessary, press the retaining pin back. Risk of damage!

Fig 20: Turning Torque Wrench Counterclockwise

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Install injectors (3).

Install hold-down device (2).

Attention!

Tighten screw (1) hand-tight only so that hold-down device (2) is slack and if necessary injector can still be turned.

Fig 21: Identifying Hold-Down Device, Injectors And Screw

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Align injectors.

Attention!

Injectors must not be twisted to 6 Nm! The injector must be replaced if this value is exceeded!

Install EMC plate (1).

Apply the counter support (2).

Fig 22: Identifying EMC Plate And Counter Support

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Insert clamping plate (1). Ensure correct installation position (see illustration).

Insert screws (2) and tighten down hand-tight only.

Fig 23: Identifying Clamping Plate And Screws

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Install pressure lines on injectors and rail. Tighten nuts (1) and (2) manually only.

Installation note:

Reinstall line damper (3).

Fig 24: Identifying Line Damper And Nuts

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Tighten down hold-down screw (1) through EMC plate.

Tightening torque 13 53 6AZ .

Fig 25: Identifying EMC Plate Hold-Down Screw

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Tighten down screws (1) of EMC plate uniformly.

Tightening torque 13 53 11AZ .

Fig 26: Identifying EMC Plate Screws

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Tighten down screw plug (1) on EMC plate.

Tightening torque 13 53 12AZ .

Fig 27: Identifying Screw Plug On EMC Plate

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Tighten down pressure lines on injectors (1).

Tightening torque 13 53 9AZ .

Then tighten down pressure lines (2) on the rail.

Tightening torque 13 53 9AZ .

Installation note:

Reinstall line damper (3).

Fig 28: Identifying Line Damper And Nuts

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Connect all connectors (1) to the injectors. Check all connectors again for correct fit and make sure that all connectors have noticeably engaged.

Fig 29: Identifying Connectors On Injectors

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Perform an injection quantity compensation:

The adjustment value is printed with three digits - depending on the version - on the injector body.

Fig 30: Identifying Adjustment Value Printed With Three Digits On Injector Body

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Connect BMW diagnosis system.
Identify vehicle.
Select "Function selection."
Select "Service functions."
Select "Engine electronics."
Select "Adjustment functions."
Select "Adjust injectors."
Select "Test plan"
For each replaced injector, the adjustment value must be entered according to the installation location (cylinder).

Fig 31: Identifying Adjustment Value Printed With Three Digits On Injector Cylinder

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Clean spark plug slot.

Assemble engine.

Check fuel system for leak tightness.

Check function of DME.