Installing the high-pressure fuel rail with injectors of the cylinders 4 to 6

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.

Mount the holder (1) above the bayonet fitting (2) on the injector.
If the holder (1) has a cast lug: Ensure that the installation position of the holder is correct.

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If necessary, note the position of the cast lug:
The holder is mounted correctly when the cast lug lies in the rear.

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If necessary, note the position of the cast lug:
The holder is mounted incorrectly when cast lug (1) lies in the 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 the special tool (distance gauge) 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 fuel rail on a clean folding table so that the openings on the high-pressure fuel rail for the injectors point upwards.
The electrical injector connections must point towards the fuel pressure sensor.

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Slide the special tool (distance gauge) 2 358 022 (2) between the holders and the rail onto the injector head.
Make sure that the special tool (distance gauge) 2 358 022 (2) rests flat on the retaining bridge .
Evenly tighten both screws (M5x30) (1) by hand until the special tool (distance gauge) 2 358 022 (2) rests flat against the high-pressure fuel rail and the holder.
Remove the special tool (distance gauge)2 358 022 (1).
Repeat operation on all injectors.

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Check injectors for loose fit at the rail.
Align the electrical injector connections parallel to the rail.
The injectors must be able to move freely.

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Change screws (A) to (D).
Parts: Screws
Attach the rail (1) with the injectors to the cylinder head from the top.
Ensure that the injector tips hit the holes provided in the cylinder head for this.
Ensure that the guides on the injector are slid correctly into the guide bore holes in the cylinder head.
Press down until a resistance can be felt, position screws (M6x70) (A), (B), (C) and (D), and turn them until hand-tight.

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Set torque wrench to 2 Nm.
Tighten the screws (A), (D), (B) and (C) in alternating order by 90° each with the torque wrench until the high-pressure fuel rail is positioned flush on the cylinder head.
The illustration shows the rail lying flat on the cylinder head.

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.
Tighten screw (A) by 5 Nm.
Tighten screw (D) by 5 Nm.
Tighten screw (B) by 5 Nm.
Tighten screw (C) by 5 Nm.
Make sure that the rail (1) rests flat against the cylinder head.

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Insert a wrench socket set into 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 torque wrench to 5 Nm.

Fig 1: Fuel Injector Rail Bolts Tightening Sequence
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NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.
Tighten the screws (M5x30) according to the following pattern:
- Fuel injector 4:
- 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 steps for screws (1) and (2) until 5 Nm is achieved for the two screws.
- Fuel injector 5:
- 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 steps for screws (3) and (4) until 5 Nm is achieved for the two screws.
- Fuel injector 6:
- 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 steps for screws (5) and (6) until 5 Nm is achieved for the two screws.
Mark all bolts (1) to (6) with a vertical line (see figure).
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°.
- Tighten the screw (5) with an angle of rotation of 90° ±15°.
- Tighten the screw (6) with an angle of rotation of 90° ±15°.
Fig 2: Fuel Injector Rail Bolts Tightening Sequence
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Check if all bolts (1) to (6) have been tightened with a 90° ±15° angle of rotation.
All markings (lines) must be horizontal (see Figure).

Fig 3: Fuel Injector Rail Bolts Tightening Sequence
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Release bolts (M6x70) (A) to (D).
The screws must be released .

NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.
Tighten screw (A) by 5 Nm.
Tighten screw (D) by 5 Nm.
Tighten screw (B) by 5 Nm.
Tighten screw (C) by 5 Nm.

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Mark all the bolts (A) to (D) with a vertical line (see Figure).
Tighten bolts (M6x70) (A) to (D) with an angle of rotation of 90°.

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Check if all screws (A) to (D) were tightened with an angle of rotation of 90°.
All markings (lines) must be horizontal (see Figure).

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Connect and lock all connectors (1) to the injectors.
All connectors (1) must engage audibly.

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

TIGHTENING TORQUE SPECIFICATIONS

Ground cable to rail
M6	tightening torque	5 Nm

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