REP-TAT-P-1353-02 Installing the injectors for the cylinders 1 to 3

WARNING: This page is about a different car, the 2018 BMW 340i, 2017 BMW 340i, and 2016 BMW 340i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Non-observance of these requirements may result in leaks and damage.

Mount the holder (1) above the bayonet closure (2) on the injector.
If the holder (1) has a cast lug : Make sure that the holder is installed in the correct position.

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Observe the position of the cast lug:
The holder is mounted correctly when the cast lug is located at the rear.

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Observe the position of the cast lug:
The holder is mounted incorrectly when the cast lug (1) is in front.

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NOTE: RISK OF DAMAGE
Damage to injectors.
Weld seams on the injector may tear due to incorrect distances between the rail and injector so that the injector must be replaced.

Insertion of the distance gauge is compulsory.
Replace distance gauge, if a thickness of 8.5 mm is no longer given in the distance gauge.

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Use special tool 2 358 022 (1).
Replace (M5x30) screws.
Parts : Screws (M5x30)
Mount the injectors with the holders and the bolts (M5x30) (1) on the rail.
Place the high-pressure rail on a clean table so that the openings on the high-pressure rail for the injectors point up.
The electrical injector connections must point to the fuel pressure sensor.

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Slide the special tool 2 358 022 (2) between the holders and the rail onto the injector head.
Make sure that the special tool 2 358 022 (2) rests flat on the retaining bridge.
Evenly tighten both screws (M5x30) (1) hand-tight until special tool 2 358 022 (2) lies flat on rail and bracket.
Remove special tool 2 358 022 (1).
Repeat this operation for all injectors.

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Check the injectors for a loose fit at the rail.
Align the electrical injector connections parallel to the rail.
The injectors must shift freely.

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Change screws (A) to (D).
Parts : screw
Attach the rail (1) with the injectors to the cylinder head from the top.
Make sure the injector tips catch the corresponding holes for the injectors in the cylinder head.
Make sure the guides on the injector are properly inserted into the guide bore holes in the cylinder head.
Press the high-pressure rail (1) down until pressure can be felt. Attach the screws (M6x30) (A) and (B) and tighten by hand.

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Tighten the screws (A) and (B) in alternating order by 180° each with the torque wrench until the high-pressure rail is positioned flush on the cylinder head.
The illustration shows the rail resting flat against the cylinder head.
Insert screws (C) and (D).

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Non-observance of these requirements may result in leaks and damage.

Tighten screw (A) to 5 Nm.
Tighten screw (D) to 5 Nm.
Tighten screw (B) to 5 Nm.
Tighten screw (C) to 5 Nm.
Connect and lock the connector (2).
The connector (2) must engage audibly.
Make sure that the rail (1) rests flat against the cylinder head.

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Attach a socket to an extension.
Do not use a reversible ratchet or torque wrench.
Tighten the bolts (M5x30) in pairs ((1) with (2), (3) with (4), (5) with (6)) in alternating order 90° hand-tight .
Set the torque wrench to 5 Nm.

Fig 1: Fuel Injector Bolts Tightening Sequence
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NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Non-observance of these requirements may result in leaks and damage.

Screw the (M5x30) bolts according to the following plan:
- Fuel injector 1:
- Tighten screw (1) at an angle of rotation of 90° ±15° with the torque wrench.
- Tighten screw (2) at an angle of rotation of 90° ±15° with the torque wrench.
- Repeat the operations for bolts (1) and (2) until both bolts reach a torque of 5 Nm.
- Fuel injector 2:
- Tighten screw (3) at an angle of rotation of 90° ±15° with the torque wrench.
- Tighten screw (4) at an angle of rotation of 90° ±15° with the torque wrench.
- Repeat the operations for bolts (3) and (4) until both bolts reach a torque of 5 Nm.
- Injector 3:
- Tighten screw (5) at an angle of rotation of 90° ±15° with the torque wrench.
- Tighten screw (6) at an angle of rotation of 90° ±15° with the torque wrench.
- Repeat the operations for bolts (5) and (6) until both bolts reach a torque of 5 Nm.
Mark all bolts (1) to (6) with a line (see illustration).
Tighten screws using an angle of rotation.
- Tighten the screw (1) with an angle of rotation of 90° ±15°.
- Tighten the screw (2) with an angle of rotation of 90° ±15°.
- Tighten the screw (3) with an angle of rotation of 90° ±15°.
- Tighten the screw (4) with an angle of rotation of 90° ±15°.
  
  Fig 2: Fuel Injector Bolts Tightening Sequence
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- Tighten the screw (5) with an angle of rotation of 90° ±15°.
- Tighten the screw (6) with an angle of rotation of 90° ±15°.
Check if all bolts (1) to (6) have been tightened with a 90° ±15° angle of rotation.
All marks (lines) must be horizontal (refer to illustration).

Fig 3: Fuel Injector Bolts Tightening Sequence
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Release screws (M6x70) (A) to (D).
It is imperative that the bolts are unscrewed.

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Non-observance of these requirements may result in leaks and damage.

Fig 4: Fuel Injector Bolts Loosening Sequence

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Tighten screw (A) to 5 Nm.
Tighten screw (D) to 5 Nm.
Tighten screw (B) to 5 Nm.
Tighten screw (C) to 5 Nm.
Mark all screws (A) to (D) with a vertical line (see illustration).
Tighten screws (M6x70) (A) to (D) with an angle of rotation of 90°.

Fig 5: Fuel Injector Bolts Tightening Sequence
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Check if all screws (A) to (D) have been tightened with a 90° angle of rotation.
All marks (lines) must be horizontal (see illustration).

Fig 6: Fuel Injector Bolts Tightening Sequence
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Connect all connectors (1) to the injectors and lock.
All connectors (1) must audibly engage.

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Thread in cable duct (3) and install.
Thread in ground cable (2) and install.
Tighten nuts (1).

TIGHTENING TORQUES SPECIFICATION

Ground cable to rail
M6	tightening torque	5 Nm

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