Install both left VANOS adjusters (cylinder head installation cylinder bank 2)

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Installing the special tool to secure the camshafts of cylinder bank 2

Check

Position the special tool 2 249 117 (1) on the camshafts of cylinder bank 2.
Check if the camshafts can be fastened with the special tool 2 249 117 (1) .
Check if the special tool 2 249 117 can be brought in contact with the cylinder head using the two screws of the cylinder head cover (2) .

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Result

» The camshafts can be fastened.

Measure

Loosen screws (2) .

Remove the special tool 2 249 117 (1) .

Continue the repair in the next step.

Result

» The camshafts cannot be fastened.

Measure

Adjust the timings of cylinder bank 2.

The installation position of the VANOS adjusters must be observed in every case.
IN is the intake adjuster (1) .

EX is the exhaust camshaft adjuster (2) .

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Replacement: Replace VANOS adjusters.
Parts: VANOS adjusters
Thread VANOS adjusters (1) in and position.

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Replacement: Replace VANOS central valves.
Parts: VANOS central valves
Position VANOS central valves (1) .
Tighten VANOS central valves (1) hand-tight.

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Installing the slide rail of cylinder bank 2 (removal/installation/replacement of the VANOS adjuster)

Position the slide rail of cylinder bank 2 (3) .

Tighten down screw (2) .

TIGHTENING TORQUES SPECIFICATION

Flat-head screw to the slide rail
Flat-head screw M6x67	Tightening torque	10 Nm

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Tighten down screw (1) .

TIGHTENING TORQUES SPECIFICATION

Collar screw to the slide rail
Collar screw M6x48	Tightening torque	10 Nm

Preloading the timing chain of cylinder bank 2

NOTE: RISK OF DAMAGE
Damage to timing chain or timing chain drive.
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive.

Always turn the engine with the chain tensioner or the special tool.

Position the special tool 2 249 162 on the cylinder head and apply the screws (1) hand-tight.
Exchange the screw (2) on the special tool 2 249 162 with an (M8x15) hexagon screw.

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Pretension special tool 2 249 162 using special tool 0 496 778 (00 9 460) at 0.6 Nm.

The flexible shaft on the special tool 0 496 778 (00 9 460) must not touch any other components, as the torque value will be falsified.

TIGHTENING TORQUES SPECIFICATION

Preload timing chain
	tightening torque	0.6 Nm

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Make straight marks on the VANOS central valves (1) and the VANOS adjusters (2) in the area of the hexagon head.
The angle must be 60°.

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Release the VANOS central valves (1) in the area of the hexagon head in a counterclockwise direction until the upper mark of the VANOS central valve matches with the lower mark.
The rotational angle is 60°.

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Turn the engine counter-clockwise by 90° at central bolt.
Make sure that the special tools (1) 0 493 882 (11 9 190) and 0 496 366 (11 8 570) (2) do not collide with other components .
Remove the special tool 0 496 366 (11 8 570) (2) .

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Position the special tool (1) 0 493 882 (11 9 190) in the recess on the engine block .
Turn the engine on the central bolt clockwise until the special tool 0 493 882 (11 9 190) (1) lies against special tool 0 496 366 (11 8 570) (2) .
Tighten special tool 0 496 366 (11 8 570) (2) hand-tight to the vibration absorber with a screw of the belt pulley (3) .
Remove the special tool (1) 0 493 882 (11 9 190) .

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Checking the preload of the timing chain for cylinder bank 2

Check the preload on the special tool 2 249 162 with the special tool 0 496 778 (00 9 460) with 0.6 Nm.
The flexible shaft on the special tool 0 496 778 (00 9 460) must not touch any other components, as the torque value will be falsified.

TIGHTENING TORQUES SPECIFICATION

Preload timing chain
	tightening torque	0.6 Nm

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Tighten VANOS central valves (1) .

TIGHTENING TORQUES SPECIFICATION

VANOS central valve initial torque
VANOS central valve	Joining torque	5 Nm

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Turn engine on the central bolt until the special tool is aligned with the struts on the engine block.
The special tool 0 496 366 (11 8 570) (3) must be fastened to the vibration absorber with a screw from the belt pulley (2) .
Slide the crankshaft in the installation position with the special tool 0 493 882 (11 9 190) (1) on the bars and fix it.

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Tighten VANOS central valves (1) .

TIGHTENING TORQUES SPECIFICATION

VANOS central valve second tightening
VANOS central valve	Snug torque 1	30 Nm
	Snug torque 2	50 Nm

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Position special tool 0 490 504 (00 9 120) (1) on the VANOS exhaust central valve.
The magnetic foot of the special tool 0 490 504 (00 9 120) must be attached to a magnetic component in the engine compartment.
The flexible element of the special tool 0 490 504 (00 9 120) (1) may not collide with other components .

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Set the angle of rotation on the special tool 0 490 504 (00 9 120) to zero.

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Tighten VANOS central intake valve until the needle on the special tool 0 490 504 (00 9 120) is at 30°.

TIGHTENING TORQUES SPECIFICATION

VANOS central valve third tightening
VANOS central valve	Angle of rotation	30°

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Position special tool 0 490 504 (00 9 120) (1) on the VANOS central intake valve.
The magnetic foot of the special tool 0 490 504 (00 9 120) must be attached to a magnetic component in the engine compartment.
The flexible element of the special tool 0 490 504 (00 9 120) (1) may not collide with other components .

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Set the angle of rotation on the special tool 0 490 504 (00 9 120) to zero.

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Tighten VANOS central intake valve until the needle on the special tool 0 490 504 (00 9 120) is at 30°.

TIGHTENING TORQUES SPECIFICATION

VANOS central valve third tightening
VANOS central valve	Angle of rotation	30°

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Turn the engine clockwise at the central bolt by 2 crankshaft revolutions until the installation position (MP) (1) of the vibration absorber (1) aligns with the bridges of the engine block.

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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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NOTE: Description is for right component only. The procedure on the left side is identical.

NOTE: To provide a better overview: Schematic diagram with partially hidden components.
Ensure that the ground surfaces of camshafts (1) point up.

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Make sure that the rounded surfaces (1) point downwards to the cylinder head.
Check and evaluate the timing once again.

Remove the special tools to disconnect the crankshaft

Remove special tool 0 493 882 (11 9 190) (1) .
Release the screw (2) of the belt pulley.
Remove special tool 0 496 366 (11 8 570) (3) .

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Removing special tool for fixing camshafts in position on bank 2

Loosen screws (2) .
Remove the special tool 2 249 117 (1) .

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Turn the engine clockwise at the central bolt by 2 crankshaft revolutions until the installation position (MP) (1) of the vibration absorber (1) aligns with the bridges of the engine block.

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Fixing the engine in the installation position on cylinder 1 (set valve timings)

Position special tool 0 496 366 (11 8 570) (3) on the vibration absorber.
Position special tool 0 493 882 (11 9 190) (1) in special tool 0 496 366 (11 8 570) .
The special tool 0 493 882 (11 9 190) (1) must not be inserted very far as it may collide with other components while turning the crankshaft.
Position reversible ratchet.
Rotate engine on the central bolt until the special tool lines up with the engine block marks.

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Hand-tighten the special tool 0 496 366 (11 8 570) (3) with a screw (2) of the belt pulley on the vibration absorber.
Slide the crankshaft in the installation position with the special tool 0 493 882 (11 9 190) (1) at the marks and fix it.

Check

Position special tool 2 249 117 (1) on the camshafts of cylinder bank 2.
Check whether the camshafts can be fixed with the special tool 2 249 117 (1) .
Check if the special tool 2 249 117 can be brought in contact with the cylinder head using the two screws of the cylinder head cover (2) .

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Result

» The camshafts can be fastened.

Measure

Loosen screws (2) .

Remove the special tool 2 249 117 (1) .

Continue the repair in the next step.

Result

» The camshafts cannot be fastened.

Measure

Adjust the timings of cylinder bank 2.