Disassembling and assembling cylinder head, right

WARNING: Hot surfaces .
Risk of burning!

Perform all work only on components that have cooled down.

WARNING: Vehicle may slip off the vehicle hoist if the vehicle hoist is handled incorrectly .
Danger! Immobilization period-threatening injuries!

Observe safety instructions on raising the vehicle using a vehicle hoist.
For additional information see: RAISING THE VEHICLE WITH A VEHICLE LIFT .

WARNING: Working on 12 V electrical system .
Risk of short circuits! Risk of fire!

Make sure that there is no charger connected to the jump start terminal in the engine compartment.
Detach battery ground lead from battery.
For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.

WARNING: Working on fuel system .
Risk of fire! Danger of explosion!

When working on the fuel system, make sure the workstation has sufficient ventilation, e.g., by means of extraction.
Tightly seal off open lines and connections; collect any leakage fuel directly at the point of exit.
No fire, sparks, open flames or smoking.

NOTE: RISK OF DAMAGE
Careless handling of tools and sharp-edged components .
Scratches, surface damage .

Protect working area.
Handle tools and components carefully.

NOTE: TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

NOTE: TECHNICAL INFORMATION
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!

Preliminary work

Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
Refer to REMOVING LUGGAGE COMPARTMENT FLOOR COVERING .
Refer to REMOVING THE LOADING EDGE TRIM .
Refer to PARTIALLY REMOVING THE LUGGAGE COMPARTMENT WHEEL ARCH TRIM PANEL ON THE LEFT AND RIGHT .
Refer to REMOVING THE COVER FOR THE WATER CHANNEL LEFT AND RIGHT .
Refer to REMOVING THE TAIL LIGHT ON THE LEFT AND RIGHT SIDE PANEL .
Refer to REMOVING THE REAR DIFFUSER .
Refer to REMOVING REAR BUMPER TRIM .
Refer to REMOVING BOTH EXHAUST COVERS .
Refer to REMOVING REAR BUMPER PANEL .
Refer to REMOVING TANK COVER ON LEFT AND RIGHT .
Refer to REMOVING CENTER STIFFENING PLATE .
Refer to REMOVING EXHAUST SYSTEM .
Refer to REMOVING THE RETAINING BRIDGE .
Refer to REMOVING THE RETAINING BRIDGE IN VEHICLES WITH A GASOLINE PARTICULATE FILTER .
Refer to PARTIALLY REMOVING THE LEFT LAMBDA OXYGEN SENSOR .
Refer to PARTIALLY REMOVING THE LAMBDA OXYGEN SENSOR .
Refer to REMOVING THE LEFT OXYGEN SENSOR MONITOR .
Refer to REMOVING THE RIGHT OXYGEN SENSOR MONITOR .
Refer to REMOVING UPPER HEAT SHIELD .
Refer to REMOVING THE LEFT HEAT SHIELD .
Refer to REMOVING RIGHT HEAT SHIELD .
Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
Refer to REMOVING LEFT AND RIGHT WIPER ARM .
Refer to REMOVING WINDSHIELD PANEL COVER .
Refer to REMOVING TRAILING LINK AT SPRING BOLT .
Refer to REMOVING THE COWL UPPER PART IN THE CENTER .
Refer to LIFTING THE HEAT SHIELD .
Refer to REMOVING THE CATALYTIC CONVERTER FOR CYLINDERS 1 TO 4 .
Refer to REMOVING THE CATALYTIC CONVERTER FOR CYLINDERS 5 TO 8 .
Refer to REMOVING THE CENTER ENGINE COMPARTMENT COVER .
Refer to REMOVING BOTH FRONT-END STRUTS .
Refer to REMOVING UPPER CROSS CONNECTION .
Refer to REMOVING THE REAR TOP CROSS CONNECTION .
Refer to REMOVING FAN COWL .
Refer to REMOVING DRIVE BELT .
Refer to RELEASING LEFT CHARGE AIR LINE PARTIALLY .
Refer to PARTIALLY RELEASING THE RIGHT CHARGE AIR LINE .
Refer to REMOVING THE FRONT BOTTOM SIDE COVER .
Refer to REMOVING THE RIGHT HAND FRONT BOTTOM SIDE COVER .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
Refer to DRAINING COOLANT .
Refer to DRAINING THE COOLANT FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
Refer to REMOVING THE COOLANT EXPANSION TANK FOR THE LOW-TEMPERATURE COOLANT CIRCUIT (CHARGE AIR COOLER) .
Refer to REMOVING BOTH CHARGE AIR COOLERS .
Refer to REMOVING THE CLEAN AIR PIPE OF CYLINDER BANK 1 .
Refer to REMOVING THE CLEAN AIR PIPE OF CYLINDER BANK 2 .
Refer to REMOVING THE IGNITION COILS OF CYLINDERS 1 AND 5 .
Refer to REMOVING IGNITION COIL OF CYLINDER BANK 1 .
Refer to REMOVING FUEL DELIVERY LINE .
Refer to REMOVING RIGHT HIGH-PRESSURE PUMP .
Refer to REMOVING RIGHT RAIL .
Refer to REMOVING THE INJECTORS FOR CYLINDERS 1 TO 4 .
Refer to REMOVING THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 1 TO 4 .
Refer to REMOVING THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 5 TO 8 .
Refer to REMOVING FRONT HEAT SHIELD .
Refer to PARTIALLY RELEASING THE GUIDE TUBE FOR THE OIL DIPSTICK .
Refer to REMOVING VANOS SOLENOID ACTUATOR, EXHAUST OF CYLINDER BANK 1 .
Refer to REMOVING THE VANOS SOLENOID ACTUATOR INTAKE OF CYLINDER BANK 1 .
Refer to REMOVING RIGHT CYLINDER HEAD COVER .
Refer to REMOVING THE SEALING CAP ON THE CYLINDER HEAD OF THE CYLINDER BANK 1 .
Refer to MOVING THE CRANKSHAFT TO THE INSTALLATION POSITION TO ADJUST THE TIMINGS .
Refer to CHECKING THE VANOS ADJUSTER OF CYLINDER BANK 1 .
Refer to RELIEVING THE CHAIN TENSIONER AT CYLINDER BANK 1 FOR CHECKING OR SETTING THE VALVE TIMINGS .
Refer to REMOVING HYDRAULIC CHAIN TENSIONER OF CYLINDER BANK 1 .
Refer to PRELOADING THE TIMING CHAIN OF CYLINDER BANK 1 .
Refer to FIXING THE ENGINE IN THE INSTALLATION POSITION ON CYLINDER 1 (SET VALVE TIMINGS) .
Refer to REMOVING BOTH RIGHT VANOS ADJUSTERS .
Refer to REMOVING SPECIAL TOOL FOR FIXING CAMSHAFTS ON BANK 1 .
Refer to REMOVING THE SPECIAL TOOL TO PRETENSION THE TIMING CHAIN AT CYLINDER BANK 1 .
Refer to REMOVING RIGHT CYLINDER HEAD .

Removing the stud bolts on the right cylinder head (cylinder head removed)

Loosen nuts (1).
Guide out and remove the sliding frame (2).
Guide out and remove the right exhaust manifold (3).

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Remove the (1) exhaust manifold seal.

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Remove the (1) stud bolts.

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Removing the engine venting connector of cylinder bank 1

Release venting connector (1).

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Removing the spark plugs of cylinder bank 1 (cylinder head removed)

CAUTION: Swirling dirt particles caused by compressed air .
Injury hazard!

Collect dirt particles, e.g. when blowing out, use cloth to do so.
Wear safety goggles.

NOTE: TECHNICAL INFORMATION
Clean spark plug slot with compressed air .
The spark plug shaft must be cleaned using compressed air after having removed the ignition coils and before removing the spark plugs. After having removed the spark plugs, once again check the sealing surface for contamination and (if necessary) clean using a moist cloth or clean using compressed air.
Deposits that are not removed according to instructions may enter the combustion chamber and lead to uncontrolled combustion. Remaining deposits on the spark plug sealing surfaces may lead to leaks and the spark plugs may come loose during engine operation.
Spark plug threads must not be greased or oiled. Insufficiently tightened spark plugs may cause leaks and the sparks plugs may come loose during engine operation.

NOTE: TECHNICAL INFORMATION
Exclusively swiveling extensions may be used for the reversible ratchet. Rigid mounting tool and variable plug connections with rigid option may not be used; there is a risk that the insulator breaks.

Unscrew the spark plugs with the special tool 0 495 560 (12 1 220) and an extension with joint.
Unscrew spark plugs (1) with special tool 0 495 560 (12 1 220) and extension with joint.

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Removing the engine mounting bracket of cylinder bank 1

Loosen screws (2).
Remove the engine mounting bracket (1).

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Attaching cylinder head of bank 1 to assembly jig, and removing and installing valves

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

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

Removing the right intake plenum (cylinder head removed)

Loosen screws (1).
Loosen screws (2).
Guide out right intake plenum.

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Removing right Valvetronic servomotor (cylinder head removed)

Loosen screws (3).
Turn Valvetronic servomotor eccentric shaft (2) counterclockwise to loosen and remove the Valvetronic servomotor (1).

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Installing the cylinder head of cylinder bank 1 on the assembly jig

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

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

Get the set of special tools 0 495 187 (00 2 300) ready.

Number	Description
1	Assembly jig
2	Flange
3	Crank
4	cover panel
5	shelf
6	Rear shaped part
7	Collecting vessel
8	Front shaped part
9	Front wheel
10	Rear wheel with stop
11	Rubber mat

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Get the set of special tools 0 494 362 (11 9 000) ready.

Number	Description
1	Device
2	Rod
3	Adapter
4	Lug
5	Quick tensioning device
6	Aluminum frame insert
7	Shaped part
8	Plastic shaped part
9	lever
10	hook
11	Valve spring cage
12	Valve spring cage
13	Valve spring cage
14	Valve spring cage
15	Valve spring cage
16	Valve spring cage
17	Valve spring cage

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Position flange (1) on the assembly jig (2).

Tighten screws (arrows).

TIGHTENING TORQUE SPECIFICATIONS

Flange to assembly jig
M14X30	Tightening torque	135 Nm

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Slide the device (1) in arrow direction onto the flange (2) and install.
Make sure that the lock (3) engages audibly.

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Loosen screw (1).
Feed out rod (2) in arrow direction and set aside.

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Keep the screws from the set of special tools 0 496 408 (11 8 080) ready.
The washer of the cylinder head bolt (1) must be used.

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Apply the cylinder head (1) hand-tight on the special tool 0 494 362 (11 9 000) in the attachment point area using the screws from the set of special tools 0 496 408 (11 8 080) .

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Removing the exhaust camshaft of cylinder bank 1

Remove the roller tappet (1) from high pressure pump bracket (2).

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Mark the guide bearing shells of the exhaust camshaft as shown in the graphic from (A1) to (A4).

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Gradually release the screws of the guide bearing in the sequence (10) to (1) in half turns .
Feed the guide bearing shell of the exhaust camshaft out and remove it.
Feed out and remove the exhaust camshaft.

Fig 1: Guide Bearing Screws Loosening Sequence

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Remove the roller cam follower of the exhaust side of cylinder bank 1

Detach and remove the roller cam followers (1) on the exhaust side from hydraulic valve clearance compensating elements (arrows).
Place all roller cam followers in order in special tool 0 495 105 (11 4 480) .

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Removing hydraulic valve clearance compensating elements on exhaust side of bank 1

Pull all exhaust hydraulic valve clearance compensating elements of the exhaust side (1) up and off.
Place all hydraulic valve clearance compensating elements in proper order on the special tool 0 495 105 (11 4 480) .

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Remove torsion springs

Precondition

If the Valvetronic servomotor is installed, the eccentric shaft must be released via the Valvetronic servomotor .

CAUTION: Spring preload .
Injury hazard!

The use of the specified special tool (tool) is mandatory.
Carry out the described steps properly.

NOTE: The description is provided only at one component. The procedure is the same for all other components.

The modified locking rods 2 411 031 must be installed on the special tool 2 249 160 .

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Position special tool 2 249 160 at a downward angle on the torsion spring panel (2).
The lug (1) should be positively locked with the torsion spring panel (2).

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The guide pins (2) in the special tool 2 249 160 should be positively locked with the recesses in the torsion spring panel (1).

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Press lever (1) on the special tool 2 249 160 in the direction of arrow until the latch mechanisms (2) lock.

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Release bolt on the plate of the torsion spring in the area (1).
Guide out special tool 2 249 160 (2) with the torsion spring and the panel of the torsion spring.

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Connect separate components of the special tool 2 249 160 (3) to (2) and secure with the locking pin (1).
The locking pin (1) should audibly engage .
Clamp special tool 2 249 160 in a standard vice at area (2).

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Use the lever (1) to push special tool 2 249 160 forward to pretension the torsion springs (3).
Pull lever (2) down to release the retaining pins (5) from the anti-twist locks (4).
Carefully release tension on the lever (1) on the special tool 2 249 160 .
Remove the torsion spring with the lock plate (3) and place it in the special tool 0 495 105 (11 4 480) in an ordered position.
Repeat steps for all torsion springs.
Twist camshaft if necessary.

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Removing the sliding block of cylinder bank 1

Position the special tool 2 249 166 on the intake camshaft (1) in the area of the sliding block (2) to be disassembled.

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Preload the sliding block (3) with the special tool 2 249 166 (2) in direction of arrow.
Loosen screw (1).
Remove the gate (3) and place it arranged in order into 0 495 105 (11 4 480) .
Repeat the step for all the gates.

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Removing the intake camshaft of cylinder bank 1

Mark guide bearing shells of the intake camshaft as shown in the graphic from (E1) to (E5).
Slacken the screws of the guide bearings with position numbers (1) and (4) in multiple steps by one half turn at a time.
Remove guide bearing shells.
Remove intake camshaft.

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Remove the intermediate lever of the intake side

Feed out the intermediate lever (1) upward from the roller cam follower (2) and the cam (3) of the eccentric shaft.
Repeat the step for all intermediate levers (1).

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Removing the roller cam follower of the intake camshaft

NOTE: The description is provided only at one component. The procedure is the same for all other components.

Release and remove the roller cam follower (2) on the intake side from the hydraulic valve clearance compensating element.
Place all roller cam followers in order in special tool 0 495 105 (11 4 480) .
Remove all hydraulic valve clearance compensating elements (1) to the top.
Place all hydraulic valve clearance compensating elements into the special tool 0 495 105 (11 4 480) along with the roller cam followers in order.

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Removing the eccentric shaft of cylinder bank 1

NOTE: RISK OF DAMAGE
Contaminant or foreign body .
Contamination can result in malfunctions, loss of function or leaks .

Adhere to the utmost cleanliness.
Protect components from contamination e.g. by covering.
Close off line connections with seal plugs.

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Release all the screws in the marked areas (1).
Twist the eccentric shaft (2) counterclockwise.
Label the bearing brackets as shown in the graphic.
Orderly set down bearing brackets (E1) to (E5) in the special tool 0 495 105 (11 4 480) .
Guide out the eccentric shaft (2) toward the top and remove it.

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Setting up cylinder head of bank 1 on special tool 119000

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

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

Prepare plastic shaped parts (1) with the shaped parts (2) and aluminum frame insert (3).

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Quick clamping devices (1) on special tool 0 494 362 (11 9 000) (2) must be unlocked.
Insert aluminum frame insert (2).

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Position cylinder head on special tool 0 494 362 (11 9 000) .
The valves in area (2) must be aligned with the plastic elements (1).

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Cylinder head (1) on special tool 0 494 362 (11 9 000) must be hand-tightened in the area of the attachment points with screws from the set of special tools 0 496 408 (11 8 080) .

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Lock quick clamping device (1) on special tool 0 494 362 (11 9 000) (2) in arrow direction.

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Select the correct valve spring cage from the set of special tools 0 494 362 (11 9 000) .

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Complete special tool 0 494 362 (11 9 000) .
Select suitable position on the lever of the valve spring cage (1) and secure hand-tight with the screws.
Hook with damper (2) can be fixed on special tool 0 494 362 (11 9 000) for easier disassembly of the valve shims.

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Remove valves

Position valve spring cage (1) on the valve head.
Push special tool 0 494 362 (11 9 000) down on the lever (3) and attach on the hook (4).
Remove valve shims (2) with magnet.
Detach hook (4).
Relieve lever (3).

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Remove valve spring cup (1).
Remove valve spring (3) and place it arranged in order in the special tool 0 495 105 (11 4 480) .
Observe color coding and direction of installation and mark and identify where required .
When replacing the valves, the cylinder head must be detached from the cylinder head 0 494 362 (11 9 000) .
Repeat step for all valves.

Replacing the valve stem seals

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NOTE: RISK OF DAMAGE
Contaminant or foreign body .
Contamination can result in malfunctions, loss of function or leaks .

Adhere to the utmost cleanliness.
Protect components from contamination e.g. by covering.
Close off line connections with seal plugs.

NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.

Disassemble the valve stem seal (1) in arrow direction with the special tool 0 490 796 (11 1 480) .

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Remove oil and dirt from the contact surface (1).

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During installation of the valve stem seal, use the special tool 0 490 797 (11 1 960) .

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Insert and install special tool 0 490 797 (11 1 960) on the valve (1).

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Insert and install valve stem seal (1) on the special tool 0 490 797 (11 1 960) .

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Guide the special tool 0 490 797 (11 1 960) out and remove.

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Press the valve stem seal (1) with the special tool 0 493 249 (11 6 380) onto the cylinder head until the stop.

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Make sure the valve stem seal (1) is properly positioned on the cylinder head (2).

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Installing valves

When replacing the valves, the cylinder head must be fastened on the special tool 0 494 362 (11 9 000) .
Observe the color coding and direction of installation .
Position the valve spring (3).
Position the valve spring cup (1).

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Position valve spring cage (1) on the valve head.
Push special tool 0 494 362 (11 9 000) down on the lever (3) and attach on the hook (4).
Insert the valve shims (2) with a magnet or screwdriver.
Detach hook (4).
Relieve lever (3).
Repeat step for all valves.

Checking the valves for tightness

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WARNING: Working on fuel system .
Risk of fire! Danger of explosion!

When working on the fuel system, make sure the workstation has sufficient ventilation, e.g., by means of extraction.
Tightly seal off open lines and connections; collect any leakage fuel directly at the point of exit.
No fire, sparks, open flames or smoking.

WARNING: Contact with hazardous fluids .
Hazardous to health!

Note and follow safety instructions on containers.
Conduct all work in appropriate personal protective equipment only.

Coat all intake valves with fuel in area (1) on the cylinder head.

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Coat all exhaust valves with fuel in area (1) on the cylinder head.

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Check

Does fuel escape from valves (1) and (2) on the cylinder head?

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Result

» No fuel escapes from the valves or valve seats.

Measure

Continue the repair with the next step.

Result

» Fuel escapes from the valves or valve seats.

Measure

Clean valves, countersink and replace if necessary.

Installing the eccentric shaft of cylinder bank 1

Coat the bearing positions of the eccentric shaft with motor oil.
Insert the eccentric shaft (2) from below and install.
Pay attention to the installation locations of the guide bearing shells (E1) to (E5).
Position bearing brackets as shown in the illustration.

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NOTE:
RISK OF DAMAGE
Contaminant or foreign body .
Contamination can result in malfunctions, loss of function or leaks .
- Adhere to the utmost cleanliness.
- Protect components from contamination e.g. by covering.
- Close off line connections with seal plugs
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Tighten all screws in the marked areas (1).

TIGHTENING TORQUE SPECIFICATIONS

Eccentric shaft bearing brackets
Screw M6	Tightening torque	10 Nm

Releasing tension on special tool 119000

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

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

Release quick clamp device (1) from the special tool 0 494 362 (11 9 000) (2) in the direction of the arrow.
Remove aluminum frame insert (2).

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Installing the roller cam follower of the intake camshaft

NOTE: The description is provided only at one component. The procedure is the same for all other components.

If a new hydraulic valve clearance compensating element has not been installed, install in the same position .
Install all hydraulic valve clearance compensating elements (1) downward.
If the roller cam followers are not being replaced, install the roller cam followers in the same position .
Install the roller cam follower (2).

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Checking the intermediate lever classification

NOTE: TECHNICAL INFORMATION
All intermediate levers are classified.
Only one classification may be used per engine.
All intermediate levers must be reinstalled in the same positions in an engine which has already been in use.

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Checking the intermediate lever classification (arrows).

Installing intermediate lever on intake side

Position intermediate lever (1) so that it contacts roller cam follower (2) and cam of eccentric shaft (3).
Repeat the step for all intermediate levers (1).

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Install intake camshaft of bank 1

Plastic rings (1) are maintenance free and do not need to be replaced.
Check plastic rings for damage, replace if necessary.

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NOTE: TECHNICAL INFORMATION
The rocker arms may slip slightly when the camshaft is positioned. Make sure rocker arms are correctly positioned on the hydraulic valve clearance compensating elements and on valves.

Position intake camshaft.
When screwing the camshafts, make sure the valves have free movement .
Position guide bearing shells according to marks (E1) to (E5).
Join the screws of the guide bearings with position numbers (1) and (4) in multiple steps by one half turn at a time until flush.

Tighten the screws (1).

TIGHTENING TORQUE SPECIFICATIONS

Intake/exhaust camshaft
M6	Snug torque	10 Nm
M6	Tightening torque	10.5 Nm

Tighten down screws (4).

TIGHTENING TORQUE SPECIFICATIONS

Intake/exhaust camshaft
M6	Snug torque	10 Nm
M6	Tightening torque	10.5 Nm

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All intermediate levers (3) must rest correctly on the idler pulley (1) and on the camshaft (4).
All intermediate levers (3) must rest correctly on the idler pulley (2) and on the eccentric shaft (5).

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Install sliding blocks of bank 1

Position the special tool 2 249 166 on the intake camshaft (1) in the sliding block (2) area.
Remove the oil and dirt from the sliding block (3).
Position the sliding block (3) and abut with the screw (1).
Preload the sliding block (3) with the special tool 2 249 166 (2) in direction of arrow.

Tighten down screw (1).

TIGHTENING TORQUE SPECIFICATIONS

Sliding block on cylinder head
Screw M7x35 10.9	Tightening torque	23 Nm

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Relieve the special tool 2 249 166 (1) and feed it out of the camshaft (2) and place aside.
Repeat the step for all the gates.

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Installing torsion springs

CAUTION: Spring preload .
Injury hazard!

The use of the specified special tool (tool) is mandatory.
Carry out the described steps properly.

NOTE: The description is provided only at one component. The procedure is the same for all other components.

Position the torsion springs (3) on the special tool 2 249 160 .
The lug in area (1) must be positively locked with the torsion spring panel (3).

The guide pins (2) in the special tool 2 249 160 must be positively locked with the recesses in the torsion spring panel (3).

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Connect individual parts of the special tool 2 249 160 (3) to (2) and secure with the locking pin (1).
The locking pin (1) should audibly engage .
Clamp special tool 2 249 160 in a standard vice at area (2).

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Use the lever (1) to push special tool 2 249 160 forward to pretension the torsion springs (3).
The retaining pins (5) should be secured to the detent (4) on both sides.
Do not operate the release lever (2).

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Feed in the special tool 2 249 160 with the torsion spring.
Position torsion springs in the intermediate levers on the cylinder head.
The ends of the torsion springs (1) must be located in the recesses of the intermediate lever (2).

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Tighten screw at area (1) on the torsion spring panel.

TIGHTENING TORQUE SPECIFICATIONS

Torsion spring on cylinder head
M6x20 screw	tightening torque	8.8 Nm

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The special tool 2 249 160 (2) must be pre-tensioned.
Press lever (1) on the special tool 2 249 160 in the direction of the arrow until the detents (2) release.

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Press the lever (1) on the special tool 2 249 160 forward to keep the torsion springs (3) tensioned.
Pull lever (2) down to release the retaining pins (5) from the anti-twist locks (4).
Carefully release tension on the lever (1) on the special tool 2 249 160 .
Remove the special tool 0 495 105 (11 4 480) .
Repeat steps for all torsion springs.
Twist camshaft if necessary.

Installing hydraulic valve clearance compensating elements on exhaust side of cylinder bank 1

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Install all exhaust hydraulic valve clearance compensating elements of the exhaust side (1) downward.

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Installing roller cam follower of the exhaust side of bank 1

Position roller cam followers (1) on exhaust side on the hydraulic valve clearance compensating elements.

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Install exhaust camshaft of the bank 1

Plastic rings (1) are maintenance free and do not need to be replaced.
Check plastic rings for damage, replace if necessary.

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Maneuver and install the exhaust camshaft.
Maneuver the guide bearing shells of the exhaust camshafts (A1) to (A4) and install them.

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NOTE: To provide a better overview: Schematic diagram with partially hidden components.
Ensure that the ground surfaces of camshafts (2) point up.
Make sure that the rounded surfaces (1) point downwards to the cylinder head.

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Check the camshaft positions of bank 1.
The cams (1) must be in the position shown.

Increment wheels (2) must form a straight line to the exhaust camshaft bearing cap and the intake camshaft bearing cap.

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Gradually bring the screws of the guide bearing in position in the sequence (1) to (10) in half turns.

Turn the screws in the order from (1) to (10) to tighten to the snug torque.

TIGHTENING TORQUE SPECIFICATIONS

Intake/exhaust camshaft
M6	Snug torque	10 Nm
M6	Tightening torque	10.5 Nm

Fig 2: Guide Bearing Screws Tightening Sequence

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Tighten the screws in the sequence (1) to (10) with the tightening torque.

TIGHTENING TORQUE SPECIFICATIONS

Intake/exhaust camshaft
M6	Snug torque	10 Nm
M6	Tightening torque	10.5 Nm

Maneuver the roller tappet (1) in the high-pressure pump bracket (2) and install it.

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Remove the cylinder head of cylinder bank 1 from the assembly jig

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

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

Release the screws 0 496 408 (11 8 080) at the special tool 0 494 362 (11 9 000) in the area of the attachment points.
Remove the cylinder head (1).

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Install Valvetronic servomotor, right (cylinder head removed)

NOTE: TECHNICAL INFORMATION
The work must be performed with vehicle care to prevent component damage.

If necessary, lever the radial shaft seal (1) out of the cylinder head using a standard tool.

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Replace radial shaft seal (1) at front.
Parts: Radial shaft seal
Grease the gearing on the worm drive in area (2) using lubricating grease.
Parts: lubricating grease
CONSUMABLE SPECIFICATIONS

Lubricating grease Longtime PD-1 400 g, Cartridge 83192160340

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Screw in the Valvetronic servomotor (1) evenly with the shaft (2) over the gearing of worm drive up to the stop.
Secure screws (3).

TIGHTENING TORQUE SPECIFICATIONS

Valvetronic servomotor on cylinder head
M6x16-8.8	Tightening torque	9.6 Nm

Installing right intake plenum (cylinder head removed)

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Replace the seal (4).
Parts: Seal

Only during replacement of the intake plenum:

Loosen screws (1).

Unlock pressure sensor (2) on the retaining tab (3).

Remove pressure sensor (2).

Position pressure sensor (2).

Retaining tab (3) must audibly lock in.

Tighten down screws (1).

TIGHTENING TORQUE SPECIFICATIONS

Pressure sensor
screw	Tightening torque	3 Nm

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Position the left intake plenum.

Tighten down screws (1).

TIGHTENING TORQUE SPECIFICATIONS

Intake plenum
M6 screw	Tightening torque	10 Nm

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Tighten down screws (2).

TIGHTENING TORQUE SPECIFICATIONS

Intake plenum
M8 screw	Tightening torque	21.4 Nm

Install engine mounting bracket of bank 1

Position engine mounting bracket (1).
Tighten screws (2).

TIGHTENING TORQUE SPECIFICATIONS

Engine suspension element
M8x22 screw	Tightening torque	20 Nm

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Installing the spark plugs of bank 1 (cylinder head removed)

NOTE: The description is provided only at one component. The procedure is the same for all other components.

Insert spark plug (1) into special tool 0496 065 (12 1 230).
NOTE: TECHNICAL INFORMATION
Do not drop spark plug into spark plug shaft! This can lead to a reduction of the electrode gap and can thus impair smooth running of the engine, especially in idle position.

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Make sure the spark plug does not fall into the spark plug shaft.
First screw spark plugs into the engine using special tool 0 496 065 (12 1 230) and tighten manually.
NOTE: TECHNICAL INFORMATION
Exclusively swiveling extensions may be used for the reversible ratchet. Rigid mounting tool and variable plug connections with rigid option may not be used; there is a risk that the insulator breaks.
Tighten spark plugs (1) with a torque wrench, special tool 0 496 065 (12 1 230) and extension with joint.

TIGHTENING TORQUE SPECIFICATIONS

Spark plugs
M12x1.25	Tightening torque	23 Nm

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Installing venting connector of bank 1

Replace the venting connector (1).
Parts: Venting connector
Tighten the venting connector (1).

TIGHTENING TORQUE SPECIFICATIONS

Venting connector/special tool to cylinder head
M8x1 Replace the venting connector.	Tightening torque	15 Nm

Installing stud bolts on the right cylinder head

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Precondition

Cylinder head is removed.

Clean sealing surfaces (1).

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Replace the stud bolt (1).
Parts: Stud bolts

Tighten the stud bolts (1) and check for correct fit.

TIGHTENING TORQUE SPECIFICATIONS

Stud bolt on cylinder head
M8x50 Replace the stud bolt.	tightening torque	20 Nm

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Replace the exhaust manifold seal (1).
Parts: Exhaust manifold seal
Position the exhaust manifold seal (1).

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The installation position of the seal (1) must be adhered to .
The seal (1) must be installed with the side of the bead (2) (seal depth) towards the exhaust manifold (3).

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Insert and position the exhaust manifold (3) at left.
Position the sliding rail (2).
Tighten nuts (1).

TIGHTENING TORQUE SPECIFICATIONS

Exhaust manifold to cylinder head
M8 Replace nuts.	tightening torque	15 Nm

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Follow-up work

Refer to INSTALLING THE RIGHT CYLINDER HEAD .
Refer to INSTALLING BOTH RIGHT VANOS ADJUSTERS .
Refer to REMOVING THE SPECIAL TOOL TO PRETENSION THE TIMING CHAIN AT CYLINDER BANK 1 .
Refer to INSTALLING THE HYDRAULIC CHAIN TENSIONER OF CYLINDER BANK 1 .
Refer to INSTALLING THE SEALING CAP ON THE CYLINDER HEAD OF CYLINDER BANK 1 .
Refer to INSTALLING THE CYLINDER HEAD COVER ON THE RIGHT .
Refer to INSTALLING VANOS SOLENOID ACTUATOR, EXHAUST OF CYLINDER BANK 1 .
Refer to INSTALLING THE VANOS SOLENOID ACTUATOR INTAKE OF CYLINDER BANK 1 .
Refer to INSTALLING RIGHT HIGH PRESSURE PUMP .
Refer to INSTALLING FUEL DELIVERY LINE .
Refer to INSTALLING THE INJECTORS FOR THE CYLINDERS 1 TO 4 .
Refer to INSTALLING THE RIGHT HIGH-PRESSURE RAIL .
Refer to INSTALLING THE IGNITION COILS OF CYLINDERS 1 AND 5 .
Refer to INSTALLING IGNITION COILS OF CYLINDER BANK 1 .
Refer to PARTIALLY INSTALLING THE GUIDE TUBE FOR THE OIL DIPSTICK .
Refer to INSTALLING FRONT HEAT SHIELD .
Refer to INSERTING THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 5 TO 8 .
Refer to INSTALLING THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 1 TO 4 .
Refer to INSTALLING THE CLEAN AIR PIPE OF CYLINDER BANK 2 .
Refer to INSTALLING CLEAN AIR PIPE OF CYLINDER BANK 1 .
Refer to INSTALLING BOTH CHARGE AIR COOLERS .
Refer to CONNECTING THE RIGHT CHARGE AIR LINE TO THE EXHAUST TURBOCHARGER .
Refer to CONNECTING THE LEFT CHARGE AIR LINE TO THE EXHAUST TURBOCHARGER .
Refer to CLOSING THE HIGH-TEMPERATURE COOLANT CIRCUIT .
Refer to INSTALLING THE COOLANT EXPANSION TANK FOR THE LOW-TEMPERATURE COOLANT CIRCUIT (CHARGE AIR COOLER) .
Refer to SEALING OFF COOLANT FOR LOW-TEMPERATURE COOLANT CIRCUIT .
Refer to INSTALLING THE UNDERBODY PROTECTION OF THE STEERING GEAR OR THE FRONT THRUST FIELD .
Refer to INSTALLING FRONT UNDERBODY PROTECTION .
Refer to INSTALLING THE BOTTOM FRONT RIGHT SIDE COVER .
Refer to INSTALLING BOTTOM FRONT COVER FROM THE SIDE .
Refer to INSTALLING DRIVE BELT .
Refer to INSTALLING FAN COWL .
Refer to INSTALLING THE REAR TOP CROSS CONNECTION .
Refer to INSTALLING UPPER CROSS CONNECTION .
Refer to INSTALLING BOTH FRONT-END STRUTS .
Refer to INSTALLING THE CENTER ENGINE COMPARTMENT COVER .
Refer to INSTALLING THE CATALYTIC CONVERTER FOR CYLINDERS 5 TO 8 .
Refer to INSTALLING THE CATALYTIC CONVERTER FOR CYLINDERS 1 TO 4 .
Refer to RELEASING THE HEAT SHIELD .
Refer to INSTALLING THE CENTER COWL UPPER PART .
Refer to INSTALLING TENSION STRUT ON SHOCK TOWER .
Refer to ATTACHING WINDSHIELD PANEL COVER .
Refer to INSTALLING LEFT AND RIGHT WIPER ARM .
Refer to INSTALLING THE REAR RIGHT ENGINE COMPARTMENT COVER .
Refer to INSTALLING THE COVER OF THE ENGINE COMPARTMENT ON THE REAR LEFT .
Refer to INSTALLING RIGHT HEAT SHIELD .
Refer to INSTALLING LEFT HEAT SHIELD .
Refer to INSTALLING HEAT SHIELD, TOP .
Refer to INSTALLING THE RIGHT OXYGEN SENSOR MONITOR .
Refer to INSTALLING THE LEFT OXYGEN SENSOR MONITOR .
Refer to PARTIALLY INSTALLING THE RIGHT LAMBDA OXYGEN SENSOR .
Refer to PARTIALLY INSTALLING THE LEFT LAMBDA OXYGEN SENSOR .
Refer to INSTALLING THE RETAINING BRIDGE IN VEHICLES WITH A GASOLINE PARTICULATE FILTER .
Refer to INSTALLING THE RETAINING BRIDGE .
Refer to INSTALLING EXHAUST SYSTEM .
Refer to INSTALLING CENTER STIFFENING PLATE .
Refer to INSTALLING TANK COVER ON LEFT AND RIGHT .
Refer to INSTALLING REAR BUMPER PANEL .
Refer to INSTALLING THE CONTROL UNIT BRACKET FOR CYLINDERS 5 TO 8 .
Refer to INSTALLING THE COVER OF THE LEFT DME CONTROL UNIT .
Refer to INSTALLING CONTROL UNIT HOLDER FOR CYLINDERS 1 TO 4 .
Refer to INSTALLING THE COVER OF THE RIGHT DME CONTROL UNIT .
Refer to INSTALLING BOTH EXHAUST COVERS .
Refer to INSTALLING THE REAR BUMPER TRIM .
Refer to INSTALLING THE REAR DIFFUSER .
Refer to INSTALLING THE TAIL LIGHT ON THE LEFT AND RIGHT SIDE PANELS .
Refer to INSTALLING COVER FOR WATER CHANNEL ON LEFT AND RIGHT .
Refer to INSTALLING THE LUGGAGE COMPARTMENT WHEEL ARCH TRIM PANEL ON THE LEFT AND RIGHT (PARTIALLY REMOVED) .
Refer to INSTALLING LOADING EDGE TRIM .
Refer to INSTALLING LUGGAGE COMPARTMENT FLOOR COVERING .
Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
Refer to FILLING AND VENTING THE LOW-TEMPERATURE COOLANT CIRCUIT .
Refer to FILLING AND VENTING THE HIGH-TEMPERATURE COOLANT CIRCUIT .