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Home >> Mini >> 2010 >> Cooper S, 2D Hatchback, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1456 (Engine - Repair (N52)) >> Variable Camshaft Timing >> 11 36 046 Removing and installing/replacing inlet and exhaust adjustment units (N52K) >> Replace central bolts

Replace central bolts

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Fig 1: Identifying Central Bolt And Chain Tensioner
G04751200Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Picture in CAD and does not show special tools.

Remove exhaust adjustment unit (1) from exhaust camshaft.

Remove inlet adjustment unit (2) from inlet camshaft.

Installation: 

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

Fig 2: Removing Inlet/Exhaust Adjustment Unit
G04751216Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Risk of mixing up the inlet and exhaust adjustment units.

Danger of engine damage! 

Inlet and exhaust adjustment units are different.

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

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

Sensor gears can be fitted alternatively.

Fig 3: Identifying AUS And EX Marks For Exhaust Camshaft
G04751217Courtesy of BMW OF NORTH AMERICA, INC.

Position inlet and exhaust adjustment units on camshafts.

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

Insert central bolts (1).

Tightening torque 11 36 1AZ .

Installation: 



Fig 1: Identifying Central Bolt And Chain Tensioner
G04751200Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Install special tool 11 4 280 to secure the central bolts on the inlet and exhaust adjustment units and camshafts.
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.
Fig 2: Locating Clamping Rail
G04751219Courtesy of BMW OF NORTH AMERICA, INC.

Adjust 11 31 505 Adjusting timing of camshaft(s) (N52K)  .

Fit 11 31 090 Installing and removing/replacing chain tensioner piston (N52K)  .

Assemble engine.

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