11 31 005 Checking camshaft timing (N20, N26)

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Special tools required:

Necessary preliminary tasks:

Remove top CLEAN AIR PIPE .
Remove SPARK PLUGS .
Remove CYLINDER HEAD COVER .
Remove underbody protection at front and rear.

Remove seal plug (1).

Rotate crankshaft at central bolt into TDC position.

Slide in special tool 2 219 548 into dowel hole and secure crankshaft.

IMPORTANT: If the flywheel is secured in the correct dowel hole with special tool 2 219 548 , the engine can no longer be moved at the central bolt.

Fig 1: Special Tool (2 219 548) And Seal Plug

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Remove seal plug (1) in direction of arrow using a screwdriver.

Fig 2: Removing Seal Plug

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NOTE: Special tool 2 219 548 can only be fixed to the flywheel (1) in the position specified (see arrow).

Fig 3: Flywheel

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Installation note:

Coat special tool 2 219 548 with oil for simplifying disassembly and installation.

Secure crankshaft with special tool 2 219 548 via the dowel hole.

Fig 4: Special Tool (2 219 548)

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NOTE: Special tool: 2 212 831

Use special tool (1) to attach special tool (4) to the cylinder head.

Fig 5: Attaching Special Tool To Cylinder Head

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Attach special tool (1) to cylinder head using a screw (2).

Fig 6: Attaching Special Tool To Cylinder Head

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Position special tool (3) without recess at mounting flats of the exhaust camshaft.

The cams of the exhaust camshaft point diagonally upwards when in TDC firing position at cylinder 1.

Fig 7: Exhaust Camshaft Points

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Position the special tool (2) with recess at the mounting flats of the intake camshaft.

With 1st cylinder in TDC firing position, cams of intake camshaft (1) point upward at an angle.

Fig 8: Intake Camshaft Points

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Fit gauge for the camshaft sensor wheel (1) to the cylinder head.

Check setting of the camshaft sensor wheels.

Special tool 2 212 830

Fig 9: Camshaft Sensor Wheel

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Position the camshaft sensor wheel of the exhaust camshaft in the direction of the arrow using the pin (1).

Position the camshaft sensor wheel of the intake camshaft in the direction of the arrow using the pin (2).

Installation note:

If the camshaft sensor wheels have been readjusted, the CENTRAL BOLTS must be loosened.

Fig 10: Camshaft Sensor Wheel Retaining Pin

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NOTE: If special tool 2 219 548 cannot be removed due to stiff movement, then it can be removed by turning and pulling with the aid of half-round long-nose pliers (angled) (1).

Fig 11: Removing Special Tool (2 219 548)

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If necessary, adjust VALVE TIMING .

Assemble engine.