18 40 040 Removing and installing/replacing the exhaust manifold (N18)

Special tools required: 

• 17 2 051

Necessary preliminary tasks: 

• Drain COOLANT .
• Remove COOLANT EXPANSION TANK .
• Remove the CATALYTIC CONVERTER .

Release the clamp and detach the charge air duct (1).

Release clamps (2) and pull off gaiter (3).

Remove intake pipe (4).

Installation note: 

Install gaiter (3) and charge-air duct (1) dry and free from grease.

Connecting branch on exhaust turbocharger must be dry and free from grease.

Fig 1: Identifying Charge-Air Duct, Intake Pipe, Gaiter And Clamps

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Release the spring strap using special tool 17 2 051 and pull off the coolant hose (1).

Fig 2: Releasing Spring Strap Using Special Tool (17 2 051)

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Release screws and detach lines (1).

Installation note: 

Replace gaskets.

Tightening torque 11 65 9AZ .

Fig 3: Identifying Lines And Screws

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Pull off hose (1).

Unlock connector (2) and remove.

Release screw (3).

Release spring strap with special tool 17 2 051 . Pull off line (4) and remove.

Fig 4: Releasing Spring Strap Using Special Tool 17 2 051

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Release screw (1) and detach line (2).

Installation note: 

Replace gaskets.

Tightening torque: 11 65 4AZ .

Release screw (3) and detach line (4).

Installation note: 

Replace sealing ring.

Tightening torque 11 65 5AZ .

Fig 5: Identifying Line And Screws

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Installation note: 

When fitting engine oil pipe and banjo bolt, install thermal protection (1).

Wrap thermal protection around engine oil pipe.

Check banjo bolt (2) and engine oil pipe for blockage. Replace blocked banjo bolt and engine oil pipe.

Fig 6: Installing Thermal Protection

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Installation note: 

Make sure that thermal protection clamp (1) engages correctly.

Fig 7: Identifying Thermal Protection Clamp

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Release screw (1).

Tightening torque 11 65 3AZ .

Release screw (2) and remove holder (3).

Tightening torque 11 65 6AZ .

Fig 8: Identifying Holder And Screws

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Release nuts and remove exhaust manifold (1).

Installation note: 

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

Fig 9: Locating Exhaust Manifold Nuts

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Release nuts and remove exhaust turbocharger (1) from exhaust manifold (2).

Observe important information during removal or replacement of the EXHAUST TURBOCHARGER !

Installation note: 

• Replace gasket and nuts.
• Clean sealing surfaces.
• Apply a thin coat of copper paste to thread.
• Tightening torque 11 65 1AZ .

Fig 10: Identifying Turbocharger, Exhaust Manifold, And Nuts

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Special tools required: 

• 17 2 051

Necessary preliminary tasks: 

• Drain COOLANT .
• Remove COOLANT EXPANSION TANK .
• Remove the CATALYTIC CONVERTER .

Release the clamp and detach the charge air duct (1).

Release clamps (2) and pull off gaiter (3).

Remove intake pipe (4).

Installation note: 

Install gaiter (3) and charge-air duct (1) dry and free from grease.

Connecting branch on exhaust turbocharger must be dry and free from grease.

Fig 1: Identifying Charge-Air Duct, Intake Pipe, Gaiter And Clamps

Courtesy of BMW OF NORTH AMERICA, INC.

Release the spring strap using special tool 17 2 051 and pull off the coolant hose (1).

Fig 2: Releasing Spring Strap Using Special Tool (17 2 051)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws and detach lines (1).

Installation note: 

Replace gaskets.

Tightening torque 11 65 9AZ .

Fig 3: Identifying Lines And Screws

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Pull off hose (1).

Unlock connector (2) and remove.

Release screw (3).

Release spring strap with special tool 17 2 051 . Pull off line (4) and remove.

Fig 4: Releasing Spring Strap Using Special Tool 17 2 051

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Release screw (1) and detach line (2).

Installation note: 

Replace gaskets.

Tightening torque: 11 65 4AZ .

Release screw (3) and detach line (4).

Installation note: 

Replace sealing ring.

Tightening torque 11 65 5AZ .

Fig 5: Identifying Line And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

When fitting engine oil pipe and banjo bolt, install thermal protection (1).

Wrap thermal protection around engine oil pipe.

Check banjo bolt (2) and engine oil pipe for blockage. Replace blocked banjo bolt and engine oil pipe.

Fig 6: Installing Thermal Protection

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Installation note: 

Make sure that thermal protection clamp (1) engages correctly.

Fig 7: Identifying Thermal Protection Clamp

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Release screw (1).

Tightening torque 11 65 3AZ .

Release screw (2) and remove holder (3).

Tightening torque 11 65 6AZ .

Fig 8: Identifying Holder And Screws

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Release nuts and remove exhaust manifold (1).

Installation note: 

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

Fig 9: Locating Exhaust Manifold Nuts

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Release nuts and remove exhaust turbocharger (1) from exhaust manifold (2).

Observe important information during removal or replacement of the EXHAUST TURBOCHARGER !

Installation note: 

• Replace gasket and nuts.
• Clean sealing surfaces.
• Apply a thin coat of copper paste to thread.
• Tightening torque 11 65 1AZ .

Fig 10: Identifying Turbocharger, Exhaust Manifold, And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.