1121500 Replacing crankshaft (N51)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on assembly stand.
Remove VIBRATION DAMPER .
Removing OIL SUMP .
Remove OIL PUMP .
Remove oil pump/vacuum pump CHAIN MODULE .
Remove TIMING CHAIN MODULE .
Remove CYLINDER HEAD .
Remove FLYWHEEL .
Remove all PISTONS .

Release screws (1).

Tightening torque: 11 13 5AZ .

Installation:

Replace aluminum screws.

Remove oil deflector (2).

Fig 1: Identifying Oil Deflector With Screws

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Release screws (1).

Tightening torque: 11 11 2AZ .

Unfasten screws (2).

Tightening torque: 11 11 3AZ .

Installation:

Replace aluminum screws.

Fig 2: Identifying Aluminum Screws

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Release screws (1).

Tightening torque: 11 11 2AZ .

Unfasten screws (2).

Tightening torque: 11 11 4AZ .

Installation:

Replace aluminum screws.

Release steel screws (1 to 14) from outside inwards.

Tightening torque: 11 11 1AZ .

Fig 3: Crankcase Bolts Tightening/Loosening Sequence

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Release screws (1).

Tightening torque 11 11 3AZ .

Installation:

Replace aluminum screws.

Remove crankcase lower section in upward direction.

Fig 4: Identifying Screws

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Remove crankshaft (1) in direction of arrow.

IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 25 kg.

Remove main bearing shells See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS N51/B30 ; CRANKSHAFT AND BEARINGS N51/B30 or CRANKSHAFT AND BEARINGS N51/B30 (2 and 3), replace if necessary.

Fig 5: Removing Crankshaft

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Check adapter sleeves (1) for damage and secure seating; replace if necessary.

Insert all crankshaft main bearing See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS N51/B30 ; CRANKSHAFT AND BEARINGS N51/B30 or CRANKSHAFT AND BEARINGS N51/B30 .

Installation:

Lubricate all bearing points with engine oil.

NOTE: Illustrations show N46.

Fig 6: Identifying Adapter Sleeves

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Insert crankshaft (1).

IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 25 kg.

Fig 7: Identifying Crankshaft

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Tighten steel screws (1 to 14) from inside outwards.

Tightening torque: 11 11 1AZ .

Tighten screws (2) from inside outwards.

Tightening torque: 11 11 4AZ .

Tighten screws (1).

Tightening torque: 11 11 2AZ .

Installation:

Replace aluminum screws.

Fig 8: Crankcase Bolts Tightening/Loosening Sequence

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Tighten aluminum screws exclusively with special tool 00 9 120.

IMPORTANT: In the case of aluminum screws, jointing torque and angle of rotation must be observed without fail.

Fig 9: Tightening Main Bearing Bolts Using Special Tool (00 9 120)

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Set up stand with magnetic base on special tool 11 4 440.

Set up special tool 00 2 510 on stand.

Position special tool 00 2 510 on crankshaft.

Move crankshaft in direction of arrow.

Determine bearing play .

Fig 10: Moving Crankshaft

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Drive in both nozzles (1) with special tool 11 9 360 on left and right into crankcase.

Installation:

Always replace nozzles (1).

Fig 11: Driving Nozzles Into Crankcase Using Special Tool 11 9 360

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Replace radial shaft seal at FRONT .

Replace radial shaft seal at REAR .

Installation:

Use PRIMER 1.3 AND LIQUID GASKET 1.4 .

Prepare liquid gasket (1) in special tool 11 4 370 DEVICE .

Screw on nozzle for injecting liquid gasket.

Fig 12: Identifying Sealing Compound And Bottle Of Injector

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Slowly insert liquid gasket (1) with special tool 11 4 370 in direction of arrow.

Fig 13: Inserting Liquid Gasket Using Special Tool (11 4 370)

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Stop (seal off) escaping liquid gasket with primer 1.3.

(Picture shows N40).

Fig 14: Inserting Brush Into Groove

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Assemble engine.