11 36 046 Removing and installing/replacing intake and exhaust adjustment units (N51)

Special tools required: 

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

Necessary preliminary tasks: 

• Remove Cylinder Head Cover 
• Check Timing 

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

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

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 5AZ 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 .

Fig 2: Chain Tensioner And Inlet And Exhaust Adjustment Units

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Detach exhaust adjustment unit (1) from exhaust camshaft.

Detach intake adjustment unit (2) from intake camshaft.

Installation: 

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

Fig 3: Removal Directions, Inlet And Exhaust Adjustment Unit

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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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Fit both adjustment units on camshafts.

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

Insert screws (1).

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

Fig 5: Central Bolts

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

Adjust Valve Timing. 

Fit Chain Tensioner. 

Fig 6: Clamping Rail

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Assemble engine.