11 65 020 Removing and installing/replacing exhaust turbocharger (N55)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 BMW 740i, 2015 BMW 740Li xDrive, 2015 BMW 740Li, 2014 BMW 740i, and 2014 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: The module consists of exhaust turbo charger and exhaust manifold.

The weight of the turbocharger is approx. 15 kg.

Necessary preliminary tasks:

Remove FAN COWL with electric fan.
Drain COOLANT .
Remove front right WHEEL ARCH PANEL .
Remove COOLANT THERMOSTAT .
Remove COOLANT PUMP .
Remove CHARGE AIR COOLER .
Remove the CATALYTIC CONVERTER .
Remove right ENGINE SUPPORT ARM .
Remove right ENGINE MOUNT .

Slacken nut (1).

Release screw (2).

Remove heat shield (3) by lifting upwards.

Fig 1: Identifying Heat Shield, Screw And Nut

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Undo sheet metal nut (1).

Remove heat shield (2) by maneuvering upwards.

Installation note:

Check retaining clamps (3) are properly seated.

Fig 2: Identifying Heat Shield, Retaining Clamps And Sheet Metal Nut

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Release screws (1).

Tightening torque 11 53 4AZ .

Fig 3: Identifying Exhaust Turbocharger Screws

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Release screw (1).

Tightening torque 11 53 10AZ .

If necessary, use appropriate tool to loosen coolant return line (3) and coolant flow line (2) at connection point.

Installation note:

Replace sealing rings.

Fig 4: Identifying Exhaust Turbocharger Coolant Return Line, Coolant Flow Line And Screw

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Release screw (1).

Loosen screws (3) but do not remove.

NOTE: Holder (2) can only be removed if turbocharger module has been removed.

Fig 5: Identifying Turbocharger Module Holder And Screws

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Release screw (1).

Tightening torque 11 42 6AZ .

If necessary, use appropriate tool to loosen oil return lines at point of connection (2).

Installation note:

Replace sealing ring.

Fig 6: Identifying Oil Return Lines Connection And Screw

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Release screw (1).

Tightening torque 11 42 7AZ .

If necessary, use appropriate tool to loosen oil return lines (2).

Installation note:

Replace sealing ring.

Fig 7: Removing Oil Return Line

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Release screw (1).

Tightening torque: 11 42 4AZ .

If necessary, use appropriate tool to loosen coolant return lines at point of connection (2).

Installation note:

Replace sealing ring.

Fig 8: Identifying Coolant Return Lines Connection And Screws

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Loosen plug connection (1) at blow-off valve.

Release screw (2).

Tightening torque 11 65 4AZ .

If necessary, use appropriate tool to loosen oil feeder lines at point of connection (3).

Installation note:

Replace sealing ring.

Fig 9: Identifying Blow Off Valve Plug Connection, Screw And Connection Point

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Disconnect vacuum hose (1) from vacuum line.

Fig 10: Identifying Vacuum Hose

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Disconnect vacuum hose (1) from cylinder head cover.

Fig 11: Identifying Cylinder Head Cover Vacuum Hose

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Remove heat shield (1).

Tightening torque: 11 65 2AZ

Loosen all flange nuts (2) along the line.

Remove module by maneuvering downwards on gearbox side.

NOTE: Overall weight of module is approximately 15 kg .

Fig 12: Identifying Heat Shield And Flange Nuts

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Remove both brackets from gearbox.

Tightening torque: 24 00 01AZ

Tightening torque: 24 00 02AZ

Fig 13: Identifying Exhaust Turbocharger Brackets

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NOTE: Oil supply line (2) can only be replaced after removal of the turbocharger.

Release screw (1).

If necessary, use appropriate tool to loosen oil feeder lines at point of connection (2).

Fig 14: Identifying Turbocharger Oil Supply Line And Screw

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Installation note:

Replace all sealing rings (1).

Fig 15: Identifying Exhaust Turbocharger Sealing Rings

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Installation note:

Replace all graphite seals (1).

Position turbocharger on cylinder head and hold in place with two bolts.

Fig 16: Identifying Exhaust Turbocharger Graphite Seals

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Insert bolt (1) but do not tighten at this point.

Fig 17: Identifying Turbocharger Module Holder And Screws

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IMPORTANT: The module consists of exhaust gas turbo loader and exhaust gas manifold and must be installed stress-free.

Torque and torque sequence must be observed without fail.

Tightening torque: 11 65 1AZ .

Join all flange nuts in sequence 1 to 15 to 8 Nm.
Tighten all flange nuts to a torque of 13 Nm in sequence (1 to 15).

Fig 18: Turbocharger Flange Nuts Tightening Sequence

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Installation note:

Flange nuts 1 to 5 are accessible from above.

Flange nuts 6 to 15 are accessible from below.

Secure screws (3).

Tightening torque: 11 65 9AZ .

Tighten bolt (1).

Tightening torque 11 65 8AZ .

Fig 19: Identifying Turbocharger Module Holder And Screws

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Assemble engine.

Observe BMW Diagnostics System instruction.

Carry out BMW leak test for intake system.