Removing and installing/replacing exhaust turbocharger, left, cylinders 5-8 (S63T2) (X6 M)

Special tools required: 

• 2 249 171

Necessary preliminary work: 

• Remove CATALYTIC CONVERTERS 5 to 8.
• Remove PRESSURE ACCUMULATOR .
• Remove CLEANING AIR PIPE .

Release clamps (1).

Detach coolant hoses (2) from exhaust turbochargers.

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Unlock, pull off and put the crankcase ventilation line (1) to one side.

Loosen screws (2).

Feed out heat shield (3).

Detach coolant hoses (2) from exhaust turbochargers.

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Release screw (1) with a suitable tool.

Tightening torque 11 42 6AZ .

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Screw type	Matching socket wrench
Hexagon screw (3)	Standard socket wrench (1)
Multi-tooth screw (4)	Multi-tooth socket wrench (2)

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Release screw (1).

Tightening torque 11 42 5AZ .

Release banjo bolt (3).

Tightening torque 11 42 4AZ .

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Installation note: 

Replace screw (1).

Parts:  Screw

Replace sealing rings (2).

Parts:  Sealing ring

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Release screw of V-band clamp (1).

Open V-band clamp (1).

Remove turbocharger with oil return line in upward direction.

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Unfasten screws (2).

Remove oil return line (1).

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Replace the oil return line (3).

Parts:  Oil return line

Replace gasket (1).

Parts:  Gasket

Replace screws (2).

Parts:  Screws

Position screw (2) in the oil return line.

Slide seal (1) on screw (2).

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Position oil return line (1).

To guarantee correct tightening of screws, a second person is required! 

Tighten screw (2) with electronic torque wrench with turning angle display.

Tightening torque 11 42 8AZ .

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The thermal length compensation (see arrows) on the oil return line (1) must not be mechanically deformed.

Installation note: 

Coat the end of the oil return line with engine oil.

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Installation note: 

If necessary, remove OIL RETURN COVER .

Replace O-rings (1) on oil return cover (2)  .

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Replace gaskets (1).

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Position turbocharger with oil return line on exhaust manifold.

Position V-band clamp (1).

Tightening torque 11 65 1AZ .

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Fit special tool 2 249 171 on left and right cylinder head covers with screws (1 and 2).

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Installation note: 

Both exhaust turbochargers must be adapted to the catalytic converters.

Exhaust turbocharger (2) must be aligned in the vertical axis on the left and right.

Move screw (1) of setting gauge up against exhaust turbocharger (2) by hand.

Adjust exhaust turbocharger (2) parallel to setting gauge.

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Secure V-band clamps.

Graphic of cylinders 1 to 4.

Screw connection of V-band clamp is too loose: 

If you can see a gap between the ends of the Vband clamps, release and then repeat the screw connection.

Tightening torque 11 65 1AZ .

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Screw connection of V-band clamp is too tight: 

If the ends of the V-band clamp are positioned under each other, release and then repeat the screw connection.

Tightening torque 11 65 1AZ .

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Installation note: 

The ends of the V-band clamp must rest parallel to each other.

Tightening torque 11 65 1AZ .

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Assemble engine.

Check vacuum connections.

Observe BMW diagnosis instructions.

1. Complete vehicle
2. Power train
3. Engine electrical system
4. Air supply
5. Charging pressure control