11 31 005 Checking camshaft timing (N20, N26)

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 . See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION or 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .

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: Removing Seal Plug

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

Fig 2: Removing Seal Plug Using Screwdriver

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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: Locating Flywheel Position

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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: Securing Crankshaft With 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: Connecting Special Tool To Cylinder Head

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

Fig 6: Connecting Special Tool To Cylinder Head Using Screw

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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: Locating Cams Of Exhaust Camshaft

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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: Locating Cams Of Intake Camshaft

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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: Identifying 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: Positioning Camshaft Sensor Wheel Of Camshafts

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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) With Half-Round Long-Nose Pliers

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If necessary, adjust VALVE TIMING .

Assemble engine.