Installing the cylinder head

CAUTION: Heavy component.
Heavy components can lead to injury or damage.

Remove and install heavy components with the aid of another person/other persons.

NOTE: RISK OF DAMAGE
Damage to threads.
Fluids in the threaded hole can damage the thread if screws in it are tightened.

Dry threaded holes (e.g. using compressed air).

NOTE: TECHNICAL INFORMATION
Do not remove screw coating.

NOTE: TECHNICAL INFORMATION
When replacing the cylinder head: The complete valve timing and the Valvetronic servomotor are already pre-assembled for new cylinder heads.

NOTE: RISK OF DAMAGE
Damage to guide rails.
The application of great force can damage the guide rails of the timing chain.

When removing and installing the cylinder head, make sure that the cylinder head does not damage the guide rail.

Feed in, position and install cylinder head (1) and exhaust turbocharger with the help of an auxiliary person, the workshop crane and the special tool 0 490 567 (11 0 020).
Ensure that the guide rails of the timing chain are not damaged.

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Insert and install washer (2).
Replace the cylinder head bolts (1).
Parts: Cylinder head bolts
Do not wash off the coating (1)of the cylinder head bolts.
Lightly oil contact surfaces of cylinder head bolt screw heads.
There must be no coolant, water or engine oil in the threaded holes of the crankcase.
Guide in and install cylinder head bolts (1).

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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.
Screw in the cylinder head bolts in the sequence (1) to (14).

Tighten the cylinder head bolts with the special tools 0 495 747 (11 8 580) and 0 490 504 (00 9 120) in the sequence (1) to (14).

Fig 1: Cylinder Head Bolts Tightening Sequence - X3 M40i, 2020-2022

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TIGHTEN TORQUES SPECIFICATION

Cylinder head to crankcase
M11 Observe tightening sequence! Fit new cylinder head bolts.	1. Joining torque	30 Nm
	2. Angle of rotation	90°
	3. Angle of rotation	180°

Replace cylinder head bolts (1) to (5).
Parts: Cylinder head bolts
Make sure that there is no coolant, water or engine oil in the threaded holes of the timing case cover.
Screw in cylinder head bolts (1) to (5).

Tighten the cylinder head bolts in the sequence (1) to (5).

TIGHTEN TORQUES SPECIFICATION

Cylinder head bolt to timing case cover
M8x40 Replace screws.	Tightening torque	19 Nm

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Feed in and position camshaft sensor wheel (1) on the intake camshaft (2).

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Rotate the intake camshaft, if necessary, in the position shown.
The recess (2) must point upward.

Tighten down screw (1).

TIGHTEN TORQUES SPECIFICATION

Camshaft sensor wheel to intake camshaft
M4x35	Tightening torque	4.5 Nm

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Replace bearing journal (1).
Parts: Bearing journal

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Feed in and install bearing journal (1) on the guide rail (2).

Tighten the bearing journals (1).

TIGHTEN TORQUES SPECIFICATION

Bearing journal to cylinder head
Bearing journal Replace the bearing journal!	Tightening torque	22 Nm

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Insert slide rail (2) and install.

Tighten down screws (1).

TIGHTEN TORQUES SPECIFICATION

Sliding rail to cylinder head
M6x16	Tightening torque	8 Nm

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Guide in and install cover (2).

Tighten down screw (1).

TIGHTEN TORQUES SPECIFICATION

Cover to rear cylinder head
M6	Tightening torque	8 Nm

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NOTE: RISK OF DAMAGE
Improper routing of cables and wiring harnesses.
Trapped, crushed or damaged cables may cause short circuits and malfunctions.

Route all cables without abrasions, do not trap and crush.

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Guide in and install the wiring harness section (2) for sensor system 1.

Tighten down screw (1).

TIGHTEN TORQUES SPECIFICATION

Cable bracket on rear cylinder head/transmission
M6x20	Tightening torque	8 Nm

NOTE: RISK OF DAMAGE
Improper routing of cables and wiring harnesses.
Trapped, crushed or damaged cables may cause short circuits and malfunctions.

Route all cables without abrasions, do not trap and crush.

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Guide in and install the transmission wiring harness (2) on the wiring harness section (3) for sensor system 1.

Tighten down screws (1).

TIGHTEN TORQUES SPECIFICATION

Cable bracket on rear cylinder head/transmission
M6x20	Tightening torque	8 Nm

CAUTION: Improper routing of the positive battery cable.Risk of short circuits!

Route the positive battery cable without abrasions and do not trap.

Insert and install the positive battery cable (3).
Secure clamps (1) and (2).

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NOTE:
RISK OF DAMAGE
Improper routing of cables and wiring harnesses.
Trapped, crushed or damaged cables may cause short circuits and malfunctions.
- Route all cables without abrasions, do not trap and crush.
Connect connectors (2) and lock.
The connector (2) must engage audibly.
Insert and position the wiring harness section (4) for the sensor system (1).
Secure clamps (3).
Connect and lock coolant line (1).
Make sure that the coolant line (1) engages audibly.

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Connect connectors (1) and lock.
The connector (1) must engage audibly.

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Replace the sealing rings (1) at the oil feed line (2) for the exhaust turbocharger using the special tool 0 496 714 (00 9 030).
Parts: Sealing ring

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Feed in and install the oil feed line (2) for the exhaust turbocharger.

Tighten down screw (1).

TIGHTEN TORQUES SPECIFICATION

Oil feed line for exhaust turbocharger to crankcase
M6x12 Replace sealing ring.	Tightening torque	8 Nm

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Tighten screw (1) on the coolant return line (2).

TIGHTEN TORQUES SPECIFICATION

Coolant return line holder to crankcase
M6X12	Tightening torque	8 Nm

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Connect and lock the coolant return line (1) to the coolant pump (2) for the exhaust turbocharger.
The coolant return line (1) must engage audibly.

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Connect and lock the coolant return line (1) for the exhaust turbocharger.
Make sure that the coolant return line (1) engages audibly.
Feed in and install the heat shield (2).

Replace screws (1).

Parts: Screws

Tighten down screws (1).

TIGHTEN TORQUES SPECIFICATION

Heat shield to cylinder head
M8X12 Replace screws.	Tightening torque	19 Nm

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Feed in and install the heat shield (3).

Replace screws (1).

Parts: Screws

Tighten down screws (1).

TIGHTEN TORQUES SPECIFICATION

Heat shield to cylinder head
M8X12 Replace screws.	Tightening torque	19 Nm

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Replace the screw (2).

Parts: Screw

Tighten down screw (2).

TIGHTEN TORQUES SPECIFICATION

Heat shield to trim strip
M6X16 Replace screw.	Tightening torque	8 Nm

Unscrew the bolts (1) of the special tool 2 459 012.
Feed out the special tool 2 459 012 at the cylinder head and remove.

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Replace the sealing rings (1) on the coolant feed line (2) for the exhaust turbocharger using the special tool 0 496 714 (00 9030).
Parts: Sealing ring

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Feed in and install the coolant feed line for the exhaust turbocharger (3).

Tighten down screw (1).

TIGHTEN TORQUES SPECIFICATION

Coolant feed line to crankcase
M6X12	Tightening torque	8 Nm

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Tighten down screw (2).

TIGHTEN TORQUES SPECIFICATION

Coolant feed line to crankcase
M6X12	Tightening torque	8 Nm

Replace screws (1) and (2).
Parts: Screws
Feed in and install support (3).

Tighten down screws (2).

TIGHTEN TORQUES SPECIFICATION

Exhaust turbocharger support to crankcase
M8x20 Replace screws.	Tightening torque	19 Nm

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Tighten down screws (1).

TIGHTEN TORQUES SPECIFICATION

Exhaust turbocharger to support
M8x25 Replace screw.	Tightening torque	19 Nm

Follow-up work

Adjust the CAMSHAFTS with the special tool.
Install the INTAKE ADJUSTER .
Install the intake adjuster VANOS CENTRAL VALVE .
Install exhaust CAMSHAFT ADJUSTER .
Install the exhaust camshaft adjuster VANOS CENTRAL VALVE .
Pre-tension the TIMING CHAIN with the special tool.
Tighten the exhaust camshaft adjuster VANOS CENTRAL VALVE .
Tighten the intake adjuster VANOS CENTRAL VALVE .
Disassemble all SPECIAL TOOLS .
Install CHAIN TENSIONER .
Check the CAMSHAFT TIMINGS .
Install the COOLANT LINE between the cylinder head and the coolant pump.
Install the INTAKE PLENUM .
Install the tank VENT VALVE .
Install control unit BRACKET .
Install the integrated POWER SUPPLY MODULE (PDM).
Install the DME CONTROL UNIT .
Install cylinder head COVER .
Install both ACTUATORS .
PREPARE the injectors for installation.
Install the high-pressure cylinders 4 to 6 RAIL with injectors.
Install cylinders 1 to 3 RAIL with injectors.
Install HIGH PRESSURE PUMP .
Install the HIGH-PRESSURE LINE between the high-pressure pump and the high-pressure rail.
Install FUEL DELIVERY LINE .
Install all SPARK PLUGS .
Install all IGNITION COILS .
Install the exhaust turbocharger OIL RETURN LINE .
Install CATALYTIC CONVERTER .
Install EXHAUST SYSTEM .
Install the tunnel connect SUPPORTS .
Install left and right TANK COVER .
Install the oxygen sensor MONITOR .
Install lambda OXYGEN SENSOR .
Install the positive battery cable HOLDER .
Install the exhaust turbocharger heating element engine ventilation line ADAPTER .
Install engine VENTILATION LINE .
Install charge AIR LINE .
Install clean AIR PIPE .
Install intake filter HOUSING .
Install fan COWL .
Install the rear top CROSS CONNECTION .
Install front CROSS CONNECTION .
Install left and right FRONT-END STRUT .
Install the left and right hood gasket SEAL .
Install the top left and right engine compartment COVER .
Fill the HIGH-TEMPERATURE COOLING SYSTEM with the vacuum fill equipment.
Fill the LOW-TEMPERATURE COOLING SYSTEM with the vacuum fill equipment.
Disconnect all battery GROUND LEADS
Vent the HIGH-TEMPERATURE COOLANT SYSTEM .
Vent the LOW-TEMPERATURE COOLING SYSTEM .
Check engine OIL LEVEL .
Check the HIGH-TEMPERATURE COOLING SYSTEM for water tightness.
Check LOW-TEMPERATURE COOLING SYSTEM for water tightness.
Install the underneath second end PANEL .
Install right sealing FRAME .
Install rear ACOUSTIC COVER .
Install the upper part COWL .
Install left and right shock tower TENSION STRUT .
Install windshield panel COVER .
Install left and right WIPER ARM .
Install the rear right engine compartment COVER .
Install the rear left engine compartment COVER .
Install the front hood rear SEAL .
Install ACOUSTIC COVER .
Install the front bottom right wheel arch COVER .
Install the left steering assembly COVER .
Install the center UNDERBODY PROTECTION .
Install rear UNDERBODY PROTECTION .
Install the front UNDERBODY PROTECTION .
Take hood out of the SERVICE POSITION .