11 36 046 Removing and installing/replacing intake and exhaust adjustment units (N52K)

11 4 280
11 4 281
11 4 282
11 4 283

Necessary preliminary tasks:

Remove Cylinder Head Cover
Check Timing

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

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

Fit special tool 11 4 281 on special tool 11 4 283.

IMPORTANT: Fit special tool 11 4 282 underneath on side of intake camshaft.

Fig 1: Screws, Special Tool (11 4 281), (11 4 282) And (11 4 283)

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Release chain tensioner (2).

For tightening torque refer to 11 31 6AZ in 11 31 CAMSHAFT .

Release central bolts on intake and exhaust adjustment units (1).

For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL VANOS .

Installation:

Replace central bolts.

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

Fig 2: Chain Tensioner And Inlet And Exhaust Adjustment Units

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Remove exhaust adjustment unit (1) from exhaust camshaft.

Remove intake adjustment unit (2) from intake camshaft.

Installation:

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

Fig 3: Removal Directions, Inlet And Exhaust Adjustment Unit

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

Danger of engine damage!

Intake and exhaust adjustment units are different.

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

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

Sensor gears can be fitted alternatively.

Fig 4: VANOS Marks

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Position intake and exhaust adjustment units on camshafts.

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

Insert central bolts (1).

For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL VANOS .

Installation:

Replace central bolts.

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

Fig 5: Central Bolts

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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.

Adjust Valve Timing.

Fit Chain Tensioner.

Fig 6: Clamping Rail

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Assemble engine.