11 36 046 Removing and installing/replacing inlet and exhaust adjustment units (N52)

Special tools required:

Necessary preliminary tasks:

IMPORTANT: To open central bolts on adjustment units and camshafts.

Fit special tool 11 4 280.

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 Tool (11 4 281), (11 4 282), (11 4 283) And Screws

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Release chain tensioner (2).

For tightening torque refer to 11 31 5AZ in 11 31 CAMSHAFT (N52) .

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

For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL (N52) .

Fig 2: Identifying Engine Central Bolt And Chain Tensioner

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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 Engine Inlet And Exhaust Adjustment Unit

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IMPORTANT:

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 Inlet And Exhaust Camshaft Mark

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Fit both adjustment units on camshafts.

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

Insert screws (1).

For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL (N52) .

Fig 5: Identifying Central Screw And Chain Tensioner

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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.

Fig 6: Identifying Clamping Rail

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Assemble engine.