Installing the high-pressure 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 the correct installation position of the holder.

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If necessary, note the position of the cast lug:
The holder is correctly mounted if the cast lug is at the rear.

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If necessary, note the position of the cast lug:
The holder is incorrectly mounted if the cast lug (1) is at 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.
Use the special tool (distance gauge) 2 358 022 (1).

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Replace (M5x30) screws.
Parts: Screws (M5x30)
Mount the injectors with the holders and the bolts (M5x30) (1) on the rail.
Place the rail on a clean table so that the openings on the rail for the injectors point upwards.
The electrical injector connections must point towards the fuel pressure sensor.
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.

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Hand-tighten both screws (M5x30) (1) evenly until the special tool (distance gauge) 2 358 022 (2) rests flat on the rail and the holder.
Remove the special tool (distance gauge)2 358 022 (1).
Repeat this operation for 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 freely movable.

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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.
Make sure that the injector tips fit into the holes provided for that in the cylinder head.
Make sure that the guides on the injector are correctly inserted into the guide bore holes in the cylinder head.
Press down until a resistance can be felt; fit the screws (M6x70) (A), (B), (C) and (D) and hand-tighten them.
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 rail is positioned flush on the cylinder head.
The illustration shows the rail lying flat on the cylinder head.

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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 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.
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.

Fig 1: Fuel Injector Screws/Bolts Tightening Sequence
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Screw the (M5x30) screws according to the following scheme:
- 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 T is reached for both 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 T is reached for both 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 T is reached for both 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°.
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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).

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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 TORQUES SPECIFICATION

Ground cable to rail
M6	Tightening torque	5 Nm

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Follow-up work

Install the HIGH-PRESSURE LINE between the high-pressure pump and the high-pressure rail.
Install all IGNITION COILS .
Install rear ACOUSTIC COVER .
Install the upper part COWL .
Install ACOUSTIC COVER .
Install windshield panel COVER .
Install left and right WIPER ARM .
Install the rear right engine compartment COVER .
Install the rear left engine compartment COVER .
Reconnect all battery GROUND LEADS
Activate the 48 v ELECTRICAL SYSTEM .
RESET ultra-small quantity adaptation.