Blocking engine in TDC firing position

Guide out and remove sealing cap (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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With the special tool 0 493 380 (11 6 480) , turn the engine in arrow direction to the TDC firing position of cylinder 1 .
Make sure the right special tool 2 288 380 is resting correctly on the lock support up to dimension (X).
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 cylinder 1 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 TDC firing position (1) of cylinder 1.

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Keep the set of special tools 2 456 372 ready:

Number	Description
1	Basic carrier
2	Setting gauge for adjusting the intake camshaft
3	Setting gauge for adjusting the exhaust camshaft
4	Basic carrier screws on cylinder head
5	Screw gauge on basic carrier

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Overview of the test gauge from the set of special tools 2 358 122 :

Number	Description
1	Test gauges for fixing in place the intake camshaft
2	Test gauges for fixing in place the exhaust camshaft

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Rotate the intake camshaft (E) and the exhaust camshaft (A) so that the marks (1) are legible from above.

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Make sure the cam (1) on the exhaust camshaft on cylinder 1 is pointing slightly to the inside right at an angle.

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Make sure the cam (1) on the intake camshaft on cylinder 1 is pointing leftwards at an angle.

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Make sure the flattened areas (1) on the intake camshaft and the exhaust camshaft are pointing upwards at an angle.

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Position the basic carrier (1) from the set of special tools 2 456 372 on the cylinder head.

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Tighten the screws (1) from special tool set 2 456 372 on the basic carrier (2).

TIGHTENING TORQUE SPECIFICATIONS

Basic carrier to cylinder head
M6	Tightening torque	8 Nm

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Position the test gauge (1) from the set of special tools 2 358 122 between the intake camshaft and the basic carrier from the set of special tools 2 456 372 .
Position the test gauge (2) from the set of special tools 2 358 122 between the exhaust camshaft and the basic carrier from the set of special tools 2 456 372 .
Tighten the screws (arrows).

TIGHTENING TORQUE SPECIFICATIONS

Test gauge to basic carrier
M6	Tightening torque	8 Nm

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