11 21 500 Replacing crankshaft (N55)

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

IMPORTANT: Aluminum screws/bolts are permitted with and without color coding (blue).
Aluminum screws/bolts must be replaced each time they are released .
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
Remove OIL SUMP
Remove OIL PUMP
Remove timing CHAIN MODULE
Remove oil pump/vacuum pump CHAIN MODULE
Remove CYLINDER HEAD .
Remove FLYWHEEL
Removing all PISTONS

Release screws (1).

Tightening torque: 11 13 5AZ .

Installation note:

Replace aluminum screws.

Remove oil deflector with integrated intake snorkel.

Fig 1: Removing Oil Deflector With Integrated Intake Snorkel

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Release aluminum screws (1).

Release aluminum screws (2).

Installation note:

Replace aluminum screws.

Fig 2: Identifying Crankshaft Aluminum Screws

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Release aluminum screws (1).

Installation note:

Replace aluminum screws.

NOTE: Graphic shows N52.

Fig 3: Identifying Bedplate Screw

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Release screws (1).

Unfasten screws (2).

Installation note:

Replace aluminum screws.

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

Remove crankcase lower section upwards.

Fig 4: Crankshaft Bolts Tightening/Loosening Sequence (N55)

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

Remove crankshaft (1) upward in direction of arrow.

Remove BEARING SHELLS (2) and guide bearing shell (3), replace if necessary.

Fig 5: Removing Bearing Shells And Guide Bearing Shell

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Clean all sealing surfaces (1) with special tool 11 4 470 .

Fig 6: Identifying Sealing Surfaces

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Check fitting sleeves for damage and secure seating; replace if necessary.

Install all BEARING SHELLS .

Installation note:

Oil all bearing points adequately with engine oil.

Fig 7: Identifying Bearing Shells

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IMPORTANT: Insert crankshaft with aid of a second person.
Weight of crankshaft approx. 25 kilograms.

Insert crankshaft (1).

Fit crankcase lower section (watch fitting bushes).

Fig 8: Identifying Crankshaft

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Fig 9: Crankshaft Bolts Tightening/Loosening Sequence (N55)

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Follow tightening/torque sequence for the steel bolts (1 to 14).

JOIN steel bolts (1).

Fig 10: Tightening Steel Bolts

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Mark across all steel bolts (1) with a colored mark.

Fig 11: Identifying Steel Bolts With Colored Mark

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Tighten all steel bolts with a special tool 00 9 120 .

Tightening torque: 11 11 1AZ .

Installation note:

All steel bolts must be positioned the same with respect to the colored mark after being fastened (see Fig 9).

Fig 12: Tightening Steel Bolts Using Special Tool 00 9 120

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Installation note:

Aluminum bolts (1) and (2) can have a blue colored mark.

Aluminum screws/bolts are not magnetic .

Fig 13: Identifying Aluminum Bolts

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

JOIN all aluminum bolts (1) from inside toward the outside.

Tightening torque: 11 11 2AZ .

Fig 14: Tightening Aluminum Bolts From Inside Toward Outside

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Mark across all aluminum bolts (1) with a colored mark.

Fig 15: Identifying Aluminum Bolts With Colored Mark

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Tighten all aluminum bolts (1) only with special tool 00 9 120 .

Tightening torque: 11 11 3AZ .

Tightening torque: 11 11 4AZ .

Installation note:

All aluminum bolts must be equally positioned with respect to the colored mark after being fastened.

Fig 16: Tightening Aluminum Bolts With Special Tool 00 9 120

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Fit special tool 11 6 252 with magnetic foot on special tool 11 4 440 .

Clamp special tool 11 6 251 on special tool 11 6 252 .

Position special tool 11 6 251 with button on the flat side of the crankshaft.

Press crankshaft (1) in direction of arrow up to stop.

Set dial gauge with knurled screw (2) on zero.

Fig 17: Fitting Special Tool 11 6 252 With Magnetic Foot On 11 4 440

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Press crankshaft (1) in direction of arrow from right to left up to stop.

Determine CRANKSHAFT AXIAL CLEARANCE. See 1121 CRANKSHAFT AND BEARINGS (N55) .

Fig 18: Pressing Crankshaft In Direction Of Arrow

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Turn crankshaft (1) via the central bolt with special tool 00 2 010 to determine the COEFFICIENT OF FRICTION. See 1121 CRANKSHAFT AND BEARINGS (N55) .

Fig 19: Turning Crankshaft Central Bolt Using Special Tool 00 2 010