13 53 310 Removing and installing/replacing an injector (N74): Notes

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

WARNING: Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high velocity from the fuel injectors!
To reduce the fuel pressure, place rag over fuel injector and carefully tap against the fuel injector with a spanner.
There is a risk of injury if the fuel pressure is not reduced!

IMPORTANT: Wear safety goggles.
Oil and dirt particles may get into your eyes!

Before removing the injectors, clean or vacuum off injector slots.

IMPORTANT: Observe without fail the tightening sequences and tightening torques when reassembling.
Disregard of these guidelines may result in leaks!

IMPORTANT: Adhere to conditions of absolute cleanliness when working 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 dirt contamination before removing lines or separate components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.
High pressure lines may be re-screwed a maximum of 10 times.

IMPORTANT: Injectors are not waterproof!
Carry out engine cleaning/washing only with ignition coil cover fitted.

Necessary preliminary tasks:

Remove IGNITION COIL of corresponding cylinder.

NOTE:

Ignition coils must not become coated with fuel!
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail! It is therefore essential to protect the spark plug slot against ingress of fuel with a cloth!
Before installing ignition coils, clean spark plug slots with compressed air.
Make sure the spark plug slot is absolutely clean.
Remove PRESSURE LINES on corresponding injectors

Picture shows the right side, the procedure for the left side is identical.

Release screws (1).

Tightening torque: see 5AZ in 12 51 ENGINE WIRING HARNESS

Release screw (2).

Tightening torque: see 5AZ in 12 51 ENGINE WIRING HARNESS

Release cable ducts (3) and (4) and place to one side.

Fig 1: Identifying Cable Ducts And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The following description applies to all injectors.

Release bolt (1) and remove holding-down element (2).

Remove injector (3).

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

Mark injectors.

Fig 2: Identifying Injector, Holding-Down Element And Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

After removing, fit protective caps (1 and 3) to injector tip and fuel line connection.

Protective caps are available from BMW Parts Service.

Fig 3: Identifying Fit Protective Caps And Uncoupling Element

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

When installing a new injector:

Use a new uncoupling element (2).
Remove protective cap (1) from injector tip max. 10 min. before installation (PTFE sealing ring swells up).

Installation note:

Fig 4: Identifying Fit Protective Caps And Uncoupling Element

Courtesy of BMW OF NORTH AMERICA, INC.

When reusing fuel injector:

Replace decoupling element (2).
Replace PTFE sealing ring (1).
A PTFE seal which has been heated once by engine operation must be replaced before the fuel injector is reinstalled.

Fig 5: Identifying PTFE Sealing Ring And Decoupling Element
Courtesy of BMW OF NORTH AMERICA, INC.