11 31 070 Checking camshaft timing on left side (S63)

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Special tools required:

IMPORTANT: The timing can only be checked with special tool 2 249 162 .
The timing may be misinterpreted if it is checked without special tool 2 249 162 .

Cylinders 5-8:

Necessary preliminary work:

Remove left CYLINDER HEAD COVER .
Remove BELT PULLEY for air conditioning system
Remove left CHAIN TENSIONER .

Mount special tool 2 249 162 at position of chain tensioner.

Pretension screw (1) to 0.6 Nm .

Fig 1: Mounting Special Tool (2 249 162)

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Pretension special tool 2 249 162 with special tool 00 9 250 or 00 9 460 to 0.6 Nm .

Graphic of cylinders 1-4.

Fig 2: Pretensioning Special Tool (2 249 162) Using Special Tool (00 9 460)

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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 3: Identifying Mounting Position (MP)

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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: Turning Engine Central Bolt And Positioning Special Tool (11 9 190) In Gear Case Cover

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IMPORTANT: When the engine is stopped, the intake and exhaust camshaft adjusters are normally locked in their initial setting.
The situation may arise in some individual cases where this initial setting 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.

Check locking of intake camshaft adjuster in initial setting:

Carefully turn against direction of rotation on hexagon head of camshafts (2) with open-end spanner (1).

The intake camshaft adjusters are locked in the initial setting when the camshafts are firmly connected to the adjusters.

Fig 5: Checking Locking Of Intake Camshaft Adjuster In Initial Setting

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Check locking of exhaust camshaft adjusters in initial setting:

Carefully turn against direction of rotation on hexagon head of camshafts (2) with open-end spanner (1).

The exhaust camshaft adjusters are locked in the initial setting when the camshafts are firmly connected to the adjusters.

Fig 6: Checking Locking Of Exhaust Camshaft Adjusters In Initial Setting

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Installation note:

The ground surface of the intake camshaft points upwards (see Fig 7).

Fig 7: Identifying Intake Camshaft Ground Surface Facing Upward

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Installation note:

The ground surface of the exhaust camshaft points upwards (see Fig 8).

Fig 8: Identifying Exhaust Camshaft Ground Surface Facing Upward

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The position of the exhaust camshaft on cylinder 8 is correct when the cam points downward.

The position of the intake camshaft on cylinder 8 is correct when the cam top points upwards at an angle.

See Fig 9.

Fig 9: Identifying Correct Position Of Intake Camshaft At Cylinder 8

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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.

Fit special tool 2 249 144 on intake camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 2 249 144 rests without a gap on cylinder head.

Screws (1) are not required for checking timing.

Fig 10: Identifying Special Tool (2 249 144) On Intake Camshaft

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Place special tool 2 249 159 on the exhaust camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 2 249 159 rests without a gap on cylinder head.

Screws (1) are not required for checking timing.

If necessary, adjust camshaft TIMING on left side.

Fig 11: Positioning Special Tools On Camshafts

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Remove all special tools.

Assemble engine.