Replace central bolts

Fig 1: Identifying Central Bolt And Chain Tensioner

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NOTE: Picture in CAD and does not show special tools.

Remove exhaust adjustment unit (1) from exhaust camshaft.

Remove inlet adjustment unit (2) from inlet camshaft.

Installation:

To facilitate removal and installation of the inlet and exhaust adjustment units, turn the sensor gears at the opening downwards.

Fig 2: Removing Inlet/Exhaust Adjustment Unit

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of mixing up the inlet and exhaust adjustment units.

Danger of engine damage!

Inlet and exhaust adjustment units are different.

VANOS is marked with AUS/EX for the exhaust camshaft.

VANOS is marked with EIN/IN for the inlet camshaft.

Sensor gears can be fitted alternatively.

Fig 3: Identifying AUS And EX Marks For Exhaust Camshaft

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Position inlet and exhaust adjustment units on camshafts.

Installation position of inlet and exhaust adjustment units can be freely selected.

Insert central bolts (1).

Tightening torque 11 36 1AZ .

Installation:

Fig 1: Identifying Central Bolt And Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Install special tool 11 4 280 to secure the central bolts on the inlet and exhaust adjustment units and camshafts.

NOTE: Picture in CAD and does not show special tools.

IMPORTANT: Incorrect installation possible!

Press clamping rail (1) by hand against guide rail and make sure timing chain is guided in clamping rail (1).

NOTE: Schematic representation of removed timing chain module.

Fig 2: Locating Clamping Rail

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Assemble engine.