18 40 050 Removing and installing/replacing front exhaust manifold (N52)

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Necessary preliminary work:

Remove REAR EXHAUST MANIFOLD

NOTE: The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove CONTROL SENSOR from cylinders 1 to 3.

Remove MONITORING SENSOR from cylinders 1 to 3.

Slacken nut (1).

Tightening torque 18 20 2AZ .

Replace self-locking nut.

Fig 1: Identifying Front Exhaust Manifold (N52) Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts.

Remove exhaust manifold (1).

Installation note:

Clean sealing faces and replace seals.

Replace nuts.

Tightening torque 18 40 1AZ .

Fig 2: Locating Exhaust Manifold Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check exhaust system for leaks.