11 21 500 Replacing Crankshaft (N52K)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

For the following special tools, refer to MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

00 2 510
00 9 120

For the following special tools, refer to ENGINE- SPECIAL TOOLS (N52K) .

11 4 370
11 4 440
11 4 470
11 9 360

IMPORTANT: Aluminum-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 . See 11 00 050 REMOVING AND INSTALLING ENGINE (N52K) .
Mount engine on assembly stand . See MOUNTING ENGINE ON ASSEMBLY STAND (N52K) .
Remove vibration damper . See 11 23 010 REMOVING AND INSTALLING/REPLACING VIBRATION DAMPER (N52K) .
Remove oil sump . See 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N52K) .
Remove oil pump . See 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (N52K) .
Remove oil pump/vacuum pump chain module . See 11 41 010 REMOVING AND INSTALLING/REPLACING CHAIN MODULE FOR OIL PUMP/VACUUM PUMP (N52K) .
Remove timing chain module . See 11 31 051 REPLACING TIMING CHAIN (N52K) .
Remove cylinder head . See 11 12 100 REMOVING AND INSTALLING CYLINDER HEAD (N52K) .
Remove flywheel . See 11 22 500 REMOVING AND INSTALLING/REPLACING FLYWHEEL (N52K) .
Removing all pistons . See 11 25 530 REMOVING AND INSTALLING/REPLACING ALL PISTONS (N52K) .

Release screws (1).

Tightening torque. See 11 13 6AZ in OIL SUMP .

Installation:

Replace aluminum screws.

Remove oil deflector (2).

NOTE: Graphic shows the screw connection of the oil deflector (2) for vehicles with optional extra SA203 (all-wheel drive).

Fig 1: Identifying Screws And Oil Deflector

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque. See 11 11 2AZ in 11 11 CRANKCASE .

Release screws (2).

Tightening torque. See 11 11 3AZ in 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

Fig 2: Identifying Screws

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Release screws (1).

Tightening torque. See 11 11 3AZ in 11 11 CRANKCASE .

Release screws (2).

Tightening torque. See 11 11 2AZ in 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

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

Tightening torque. See 11 11 1AZ in 11 11 CRANKCASE .

Fig 3: Crankcase Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque. See 11 11 3AZ in 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

Lift out bedplate.

Fig 4: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Remove crankshaft (1) in direction of arrow.

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

Remove bearing shells (2) and guide bearing shell (3), replace if necessary. See 11 21 531 REPLACING ALL MAIN CRANKSHAFT BEARING SHELLS (N52K) .

Clean all sealing faces with special tool 11 4 470.

Fig 5: Removing Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

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

Install all bearing shells. See 11 21 531 REPLACING ALL MAIN CRANKSHAFT BEARING SHELLS (N52K) .

Installation:

Lubricate all bearing points with engine oil.

NOTE: Graphic shows N46.

Fig 6: Identifying Adapter Sleeves

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Insert crankshaft (1).

IMPORTANT: Install 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. See 11 11 1AZ in 11 11 CRANKCASE .

Tighten screws (2) from inside outwards.

Tightening torque. See 11 11 2AZ in 11 11 CRANKCASE .

Tighten screws (1).

Tightening torque. See 11 11 4AZ in 11 11 CRANKCASE .

Fig 8: Crankcase Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace aluminum screws.

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: Identifying Special Tool (00 9 120)

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Set up stand with magnetic foot (1) 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. See ENGINE - TECHNICAL DATA (N52K) .

Fig 10: Moving Crankshaft With Special Tools (11 4 440 And 00 2 510)

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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: Identifying Nozzles With Special Tool (11 9 360)

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Installation:

Prepare sealing compound (1) in special tool 11 4 370.

Screw on nozzle (2) for injecting sealing compound.

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

Fig 12: Inserting Sealing Compound With Special Tool (11 4 370)

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Stop (seal off) escaping liquid gasket with primer 1.3. (Picture shows N40).

Fig 13: Sealing Escaping Liquid Gasket With Primer

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Assemble engine.