11 31 070 Checking camshaft timing on left side (N63O1)

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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) And Pretensioning Screw

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

Illustration of cylinders 1-4.

Fig 2: Pretensioning Special Tool (2 249 162)

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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 MP Marking

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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 To 150° Crankshaft Position Before TDC Firing Position Of Cylinder 1

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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 adjuster in initial setting:

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

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

Fig 5: Turning Hexagon Head Of Intake Camshafts

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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: Turning Hexagon Head Of Exhaust Camshafts

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Installation note:

Fit special tool 2 249 117 when the ground surface of the intake camshaft faces up (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 must face up (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 And Exhaust 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: Checking Timing Adjustment - 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: Checking Timing Adjustment - Exhaust Camshaft

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Remove all special tools.

Assemble engine.