18 40 040 Removing and installing/replacing exhaust manifold (N12)

WARNING: This page is about a different variant/trim than selected.

WARNING: Scalding hazard!
Only perform these tasks after exhaust system has cooled down.

Necessary preliminary tasks:

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

Release screws and remove upper heat shield (1).

Tightening torque 11 65 7AZ

Fig 1: Locating Upper Heat Shield Screws

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Release screws and remove lower heat shield (1).

Tightening torque 11 65 7AZ

Fig 2: Locating Lower Heat Shield Screws

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Unfasten screws.

Tightening torque 18 40 3AZ

Fig 3: Locating Screws

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Release nuts and remove exhaust manifold (1).

Installation:

Replace seal and nuts.
Clean sealing surfaces.
Apply a thin coat of copper paste to thread.
Tightening torque 18 40 1AZ

Fig 4: Locating Exhaust Manifold Nuts
Courtesy of BMW OF NORTH AMERICA, INC.