18 40 010 Removing and installing/renewing left exhaust manifold (N74)

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WARNING: Scalding hazard!
Only perform these tasks on an engine that has cooled down.

Necessary preliminary tasks:

Remove CLEAN-AIR PIPE, cylinders 7-12
Remove INTERMEDIATE PIPE, cylinders 7-12

Release screws (1).

Tightening torque: see 9AZ in 18 31 EXHAUST SYSTEM

Remove heat shield (2).

Release screw (3).

Tightening torque: see 10AZ in 18 31 EXHAUST SYSTEM

Release holder (4) with check valve and lay to one side.

Fig 1: Identifying Heat Shield, Holder And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts along line (1).

Replace self-locking nuts

Tightening torque: see 8AZ in 18 31 EXHAUST SYSTEM

Feed out exhaust manifold (2) and remove.

Replace seal.

Installation:

Seal beads faces the exhaust manifold.

Reinstall holder (3) for the catalytic converter.

Fig 2: Identifying Exhaust Manifold, Catalytic Converter Holder And Line

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check exhaust system for leaks.