11 21 500 Replacing Crankshaft (S85): Notes

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 9120
00 9130
11 4 370
11 5 311
11 5 312
11 5 313
11 5 331
11 5 332
11 5 333
11 7 231
11 9 360

IMPORTANT: Unscrew all fit bolts first before releasing the crankshaft lower section.
Altered settling behavior at the crankcase!
If the main bearing channel is opened after engine operation, all main bearing shells must be replaced with special repair bearing shells marked with an (R).
There are two different groups of main bearing shells.

Necessary preliminary tasks:

Remove engine .
Mount engine on assembly stand .
Remove flywheel .
Remove oil pan .
Remove engine oil pump .
Remove VANOS high-pressure pump .
Remove left cylinder head or right cylinder head .
Remove all pistons .
Remove vibration damper .
Remove both timing chains .

IMPORTANT: Unscrew all M8 fit bolts (2) first before releasing the crankshaft lower section - risk of damage!

Release all bearing block bolts (1) from inside outwards.

Installation:

Replace fine-mesh strainer (3).

Fig 1: Identifying Bearing Block Bolts And Fine-Mesh Strainer

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Release screws (3).

Unfasten screws (2).

Bolts (1) from inside outwards.

Lift out bedplate.

Fig 2: Identifying Screws And Bolts

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Lever out crankshaft (1) with aid of a second person in direction of arrow.

NOTE: Weight of crankshaft approx. 22 kg.

Fig 3: Levering Out Crankshaft

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IMPORTANT: If the bedplate is opened and closed again, fit special main bearing shells marked with (R) on the bearing backs.

Replace all bearing shells (1 and 2).

Installation:

Replace main bearing shells.

Fig 4: Identifying Bearing Shells

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Remove sealing compound from joint (1).

Carefully clean threads and contact faces in upper and lower sections of crankcase.

Installation:

Replace nozzles (2).

Fig 5: Identifying Nozzles

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Installation:

Apply a light coating of engine oil to bearing shells.

Lay crankshaft (1) with a second person helping in direction of arrow into crankcase.

NOTE: Weight of crankshaft approx. 22 kg.

Fig 6: Laying Crankshaft Into Crankcase

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IMPORTANT: Adhere without fail to the specified sequence of bedplate bolt connections.
Risk of damage to crankshaft.
Leaks at bedplate/crankcase.

NOTE: There are no more dowel sleeves in the crankcase.
Position bedplate on crankcase.

IMPORTANT: Do not use new bolts.
If new bolts are used, observe special tightening/torque specifications.

Position lower section diagonally on bearing blocks (1 and 6) using two fit bolts (1).

Join fit bolts (1) to 8 Nm.

Fig 7: Identifying Fit Bolts

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Insert remaining 10 fit bolts (1) and join to 8 Nm.

Fig 8: Inserting Remaining 10 Fit Bolts

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Insert all M11 bolts (1).

Fig 9: Identifying M11 Bolts

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Fig 10: Crankcase Bolts (M8 And M11) Tightening/Loosening Sequence

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