1136046 Removing and installing/replacing inlet and exhaust adjustment units (N51)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Check TIMING .

IMPORTANT: To release central bolts on adjustment units and camshafts.
Fit special tool 11 4 280 GAUGE .
Fit special tool 11 4 283 with screws (1).
Fit special tool 11 4 281 on special tool 11 4 283.

IMPORTANT: Special tool 11 4 282 must be fitted underneath on inlet camshaft.

Fig 1: Identifying Special Tools

G04751157

Courtesy of BMW OF NORTH AMERICA, INC.

Release chain tensioner (2).

Tightening torque: 11 31 5AZ .

Release central bolt on inlet/exhaust adjustment units (1).

Tightening torque: 11 36 1AZ .

NOTE: Illustrations in CAD and do not show special tools.

Fig 2: Identifying Central Bolt And Chain Tensioner

G04751200

Courtesy of BMW OF NORTH AMERICA, INC.

Detach exhaust adjustment unit (1) from exhaust camshaft.

Detach inlet adjustment unit (2) from inlet camshaft.

Installation:

To facilitate removal and installation of adjustment units, turn sensor gears at cutout downwards.

Fig 3: Detaching Inlet And Exhaust Adjustment Units

G04751216

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT:

Danger of mixing up adjustment units .
Mixing up the adjustment units will result in engine damage.

The inlet and exhaust adjustment units are different.

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

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

Sensor gears can be fitted alternatively.

Fig 4: Identifying AUS And EX Marks For Exhaust Camshaft

G04751217

Courtesy of BMW OF NORTH AMERICA, INC.

Fit both adjustment units on camshafts.

The installation position of the adjustment units can be freely selected.

Insert screws (1).

Tightening torque: 11 36 1AZ .

IMPORTANT: To secure central bolts on adjustment units and camshafts.
Fit special tool 11 4 280 GAUGE .

NOTE: Illustrations in CAD and do not show special tools.

Fig 5: Identifying Central Bolt And Chain Tensioner

G04751200

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Incorrect installation possible.

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

NOTE: Schematic representation on removed chain drive.

Adjust VALVE TIMING .

Fit CHAIN TENSIONER .

Fig 6: Locating Chain Drive

G04751219

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.