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

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Necessary preliminary tasks:

Remove acoustic cover . See 11 00 REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N52) .
Remove complete exhaust system .
Remove right engine support arm . See 22 11 100 REPLACING RIGHT ENGINE SUPPORT ARM (N52/N52K/N53) .

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

Remove CONTROL SENSORS from cylinders 1 to 3.

Remove monitor sensor from cylinders 1 to 3. See 78 EMISSION CONTROL, OXYGEN SENSOR

Unscrew nuts.

Remove exhaust manifold (1).

Fig 1: Locating Exhaust Manifold Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Clean sealing faces and replace seals.

Replace nuts.

Tightening torque 18 40 1AZ , see EXHAUST SYSTEM - TIGHTENING TORQUES .