11 36 046 Removing And Installing/Replacing Inlet And Exhaust Adjustment Units (N51)

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Special tools required:

For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .

11 4 280
11 4 281
11 4 28
11 4 283

Necessary preliminary tasks:

Remove cylinder head cover . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N51) .
Check timing . See 11 31 005 CHECKING CAMSHAFT TIMING .

IMPORTANT: To release central bolts on adjustment units and camshafts. Fit special tool 11 4 280. See Fig 1.

Fit special tool 11 4 283 with screws (1).

Fit special tool 11 4 281 on special tool 11 4 283. See Fig 1.

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

Fig 1: Identifying Central Bolts On Adjustment Units And Camshafts

G04751157

Courtesy of BMW OF NORTH AMERICA, INC.

Release chain tensioner (2).

Tightening torque. See 11 31 5AZ in 11 31 CAMSHAFT .

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

Tightening torque. See 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL .

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

Fig 2: Identifying Chain Tensioner And Central Bolt

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: Identifying Inlet/Exhaust Adjustment Unit

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. See 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL .

Fig 5: Identifying Screws

G04751200

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

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 . See 11 31 505 ADJUSTING CAMSHAFT TIMING (N51) .

Fit chain tensioner . See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N51) .

Fig 6: Securing Timing Chain Guided In Clamping Rail

G04751219

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.