11 31 071 Checking camshaft timing on right side (N63)

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Special tools required:

IMPORTANT: The timing can only be checked with special tool 11 9 900 .
The timing may be misinterpreted if it is checked without special tool 11 9 900 .

Cylinders 1-4:

Necessary preliminary work:

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

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

Preload hexagon socket screw with special tool 00 9 250, see 00 9 460 to 0.6 Nm.

Fig 1: Mounting Special Tool 11 9 900 And Pre-Loading Hex Socket Screw

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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: Identifying 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 And Securing With Bolt

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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 At 150° Before Cylinder No. 1 Firing TDC Position 1

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

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

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

Fig 5: Locating Mark Of Cams On Intake And Exhaust Camshaft

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IMPORTANT: When the engine is shut down, the intake and exhaust camshaft adjusters 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 an open-end spanner (1), carefully try to rotate camshafts against direction of rotation.

Fig 6: Identifying Hexagon Head Of Camshafts

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

NOTE: Illustration corresponds to cylinders 5-8.

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: Placing Special Tool (11 9 893) Onto Exhaust Camshaft

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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 right side.

Fig 8: Fitting Special Tool (11 9 893) Onto Intake Camshaft

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Remove all special tools.

Assemble engine.