Checking camshaft timing

Have the special tool 2 358 122 ready.

Number	Description
1	Basic carrier
2	Basic carrier screws on cylinder head
3	Gauge to fix exhaust camshaft
4	Gauge to fix intake camshaft
5	Screw gauge on basic carrier

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Have the special tool 2 288380 ready.

Number	Description
1	Locating stud

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Have the special tool 0 493 380 (11 6 480) ready.

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If applicable, remove the cover (1).

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NOTE:
RISK OF DAMAGE
Damage to the engine.
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged.
- Only rotate the engine manually in the correct direction of rotation: a) clockwise when looking at the damper, or b) counterclockwise when looking at the chain drive, b) applies only if the timing chain is installed in the rear.
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Turn the engine with the special tool 0 493 380 (11 6 480) to the TDC firing position of cylinder (1).
Guide out and remove sealing cap (1).

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Make sure that the special tool 2 288 380 is inserted up to the dimension (X) into the dowel hole.
Dimension (X) = 55 mm

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Check whether the correct dimension has been reached
The special tool 2 288 380 is incorrectly positioned.

The TDC firing position (1) of the 1st cylinder is not achieved.

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Check whether the correct dimension has been reached
The special tool 2 288 380 is correctly positioned.

The engine is in the TDC firing position (1) of the 1st cylinder.

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Check
Check whether the marks (1) on the intake and exhaust camshafts can be read from above.

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Result

» Marks (1) cannot be read from the top.

Measure
- Turn the camshafts to the correct position or re-adjust the valve timing.
Check
Check whether the center of the three flattened areas (1) on both camshafts points upwards. The special tool 2 358 122 can also be mounted if the camshafts are twisted by 180° (central flattened area points downwards).

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Result

» The center of the three flattened areas (1) does not point upwards.

Measure
- Turn the camshafts to the correct position so that the center of the three flattened areas (1) on both camshafts points upwards.
The cam on the exhaust camshaft on the first cylinder points obliquely inwards to the right.

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The cam on the intake camshaft on the first cylinder points obliquely to the left.

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Secure the basic carrier (1) of the special tool 2 358 122 with the screws (2) on the cylinder head.
Position gauge (3) with the recess on the exhaust camshaft and fix with the screws (5) on the basic carrier (1).
Position gauge (4) with the recess on the intake camshaft and fix with the screws (5) on the basic carrier (1).
NOTE: If the special tool 2 358 122 cannot be mounted, the valve timing must be readjusted.

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