Replacing the exhaust camshaft adjuster on the left

Position special tool 2 249 117 (1) on the camshafts of cylinder bank 2.
Secure the camshafts using special tool 2 249 117 (1).
Hand-tighten the special tool 2 249 117 (1) with 2 screws (2) of the cylinder head cover until it lies against the cylinder head.

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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.

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Release the timing chain on the special tool 2 249 162 (1) by turning the hexagon bolt (2).
The special tool 2 249 162 (1) remains in the cylinder head.
Loosen screw (1).
Loosen screw (2).
Remove the slide rail (3) of the cylinder bank 2.

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Release VANOS central valve (1).
Make sure that the exhaust camshaft adjuster and the intake adjuster must not be removed from the camshafts.

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Release VANOS central valve (1) and remove.
Feed out VANOS adjuster (2) and remove.

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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 adjuster (2).
Parts : VANOS unit
Guide in the VANOS adjuster (2) and position it.
The VANOS adjuster (2) must lie flat on the camshaft.
Tighten VANOS central valve (1) hand-tight.

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Tighten VANOS central valves (1) hand-tight.

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

TIGHTENING TORQUES SPECIFICATION

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

Tighten down screw (1).

TIGHTENING TORQUES SPECIFICATION

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

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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.

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Position the special tool 2 249 162 on the cylinder head and hand-tighten the screws (1).
Exchange the screw (2) on the special tool 2 249 162 with an (M8x15) hexagon screw.
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 come in contact with other components, otherwise the torque value is 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 0 493 882 (11 9 190) (1) 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 0 493 882 (11 9 190) (1) 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).
Hand-tighten the special tool 0 496 366 (11 8 570) (2) with a screw (3) of the belt pulley on the vibration absorber.
Remove the special tool 0 496 366 (11 8 570) (1).

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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 come in contact with other components, otherwise the torque value is 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 secured with a screw (2) of the belt pulley on to the vibration absorber.
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	Joining torque	30 Nm
	Joining torque	50 Nm

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Position the 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) (1) 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 display of angle of rotation on the special tool 0 490 504 (00 9 120) to zero (arrow).

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

TIGHTENING TORQUES SPECIFICATION

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

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Position the special tool 0 490 504 (00 9 120) (1) on the VANOS intake 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 display of angle of rotation on the special tool 0 490 504 (00 9 120) to zero (arrow).

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

TIGHTENING TORQUES SPECIFICATION

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

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Check camshaft positions of cylinder bank 2.
The cams (1) must be in the position shown.

The increment wheels (2) must form a line to the exhaust camshaft bearing cap and to 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.

Make sure that the ground surfaces (2) of the camshafts point up.
Make sure that the rounded surfaces (1) point downwards to the cylinder head.
Check and evaluate the timing once again.

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

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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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Crank the engine on the central bolt twice in a clockwise direction until the installation position (1) of the vibration absorber aligns with the marks of the engine block.

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Position special tool 0 496 366 (11 8 570) (3) on the vibration absorber.
Position the special tool 0 493 882 (11 9 190) (1) in the special tool 0 496 366 (11 8 570) (3).
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.
Rotate the engine on the central bolt in direction of engine rotation until the special tool aligns 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.

Timings are correct.

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.

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

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