Adjusting the timing at cylinders 5-8

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

Press back the chain tensioner (2) using the tensioning rail.
Lock the piston on the chain tensioner (2) using the special tool 0 491 012 (11 4 120) .
Loosen the screws (1) and remove the chain tensioner (2).

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NOTE: TECHNICAL INFORMATION
Due to more difficult accessibility: Exchange the screw on the special tool with an M8x15 screw.

Adjust special tool 0 496 778 (00 9 460) to 0.6 Nm.
Pretension timing chain with special tool 2 249 162 .

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Loosen screws in the order (4) to (1). Remove the belt pulley.

Fig 1: Belt Pulley Screws Loosening Sequence
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Note the identification MP (= installation position).
The identification MP (= installation position) is important for the installation of the special tool 0 496 366 (11 8 570) .

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Crank the engine further on the central bolt until special tool 0 493 882 (11 9 190) can be positioned in the timing case cover.

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NOTE: Special tools can only be mounted if the ground surfaces point upward (see arrow).

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Position special tool 2 249 144 on the intake camshaft of bank 5-8 in the direction of the arrow and secure with one screw (1) each.

TIGHTENING TORQUES SPECIFICATION

Special tool, gauge to cylinder head
M6x35	Tightening torque	10 Nm

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Position special tool 2 249 159 on the exhaust camshaft and screw to special tool 2 249 144 .

TIGHTENING TORQUES SPECIFICATION

Special tool to special tool, gauges
M6x20	Tightening torque	10 Nm

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Align the intake and exhaust camshafts so that the ground surfaces of the camshaft point upwards.
All special tools 2 249 117 must be mounted for the screw connection.

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Crank the engine backwards by 10° using the central bolt.

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Insert special tool 0 493 882 (11 9 190) at the timing case.
Crank the crankshaft on the central bolt using a reversible ratchet (2) in the direction of engine rotation until it is in contact with special tool 0 493 882 (11 9 190) , see figure.

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Insert the VANOS central valve (1) of the intake side.

TIGHTENING TORQUES SPECIFICATION

1. VANOS central valve of variable camshaft timing control to camshaft
M22x1	1. Joining torque	5 Nm
	2. Joining torque	30 Nm
	3. Joining torque	50 Nm
	4. Angle of rotation	30°

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TIGHTENING TORQUES SPECIFICATION

1. VANOS central valve of variable camshaft timing control to camshaft
M22x1	1. Joining torque	5 Nm
	2. Joining torque	30 Nm
	3. Joining torque	50 Nm
	4. Angle of rotation	30°

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Crank the engine further on the central bolt until special tool 0 493 882 (11 9 190) can be positioned in the timing case cover.
The engine is now in the crankshaft position of 150 degrees before the TDC firing position of cylinder 1.

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Insert the VANOS central valve (1) of the intake side.

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TIGHTENING TORQUES SPECIFICATION

Chain tensioner to cylinder head
M7	Joining torque	13 Nm

Remove special tool 0 491 012 (11 4 120) .

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Position the timing case cover (2).
Secure screws (1).

TIGHTENING TORQUES SPECIFICATION

End cover (oil) to cylinder head
M6x20	Tightening torque	10 Nm

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