Cylinders 5-8

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Necessary preliminary work

Remove left CYLINDER HEAD COVER .
Remove FAN COWL with electric fan.
Remove BELT PULLEY for air conditioning system.
Remove left CHAIN TENSIONER .

Mount special tool 11 9 900 at position of chain tensioner.

Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm .

NOTE: Graphic corresponds to cylinders 1-4.

Fig 1: Mounting Special Tool (11 9 900) At Position Of Chain Tensioner

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NOTE: Marking (MP = Mounting Position) is important for installing special tool 11 8 570 .

MP = 150° before cylinder no. 1 firing TDC position.

Fig 2: Locating Mounting Position (MP) Marking

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Position special tool 11 8 570 with dihedron on vibration damper in such a way that it can be secured with bolt (1) at the MP marking.

NOTE: Setting groove on crankcase, see arrow.

Fig 3: Positioning Special Tool (11 8 570) With Dihedron On Vibration Damper

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Crank engine at central bolt.

Secure vibration damper with special tools 11 8 570 and 11 9 190 at 150° before cylinder no. 1 firing TDC position .

Fig 4: Securing Vibration Damper Using Special Tools

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With cylinder no. 1 at 150° before firing TDC position, cams on exhaust camshaft (A) at cylinder no. 5 point at an angle to the left.

Cams on inlet camshaft (E) point at an angle downwards.

NOTE: For purposes of clarity, the graphic shows the inlet and exhaust adjustment units removed.

Fig 5: Identifying Inlet And Exhaust Camshaft

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IMPORTANT: When the engine is shut down, the inlet and exhaust adjustment units are normally locked in their initial position.
The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the camshaft adjuster.
In order to avoid incorrect timing adjustment, it is essential to check the locking of the camshaft adjuster and if necessary perform locking by rotating the camshafts.

Checking locking of intake and exhaust camshaft adjusters in initial setting:

Gripping hexagon head (2) of camshafts with a fork wrench (1), carefully try to rotate camshafts against direction of rotation.

The intake and exhaust camshaft adjusters are locked in the initial setting when the camshafts are non-positively connected to the adjusters.

Fig 6: Rotating Camshafts Using Fork Wrench

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IMPORTANT: If the intake or exhaust camshaft adjusters of the camshafts "cannot" be locked as described, the adjuster is faulty and must be replaced.

Place special tool 11 9 893 on the exhaust camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

Fig 7: Checking Exhaust Camshaft Timing Adjustment Using Special Tool (11 9 893)

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Fit special tool 11 9 893 on intake camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

If necessary, adjust camshaft TIMING on left side.

Fig 8: Checking Intake Camshaft Timing Adjustment Using Special Tool (11 9 893)

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Remove all special tools.

Assemble engine.