11 21 500 Replacing crankshaft (N52K)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

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.
The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove engine
Mount engine on assembly stand, see Mounting engine on assembly stand (N52K) .
Remove VIBRATION DAMPER
Remove oil sump
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: 11 13 6AZ, see 11 13 OIL PAN .

Installation:

Replace aluminum screws.

Remove oil deflector (2).

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

Fig 1: Oil Deflector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: 11 11 2AZ, see 11 11 CRANKCASE .

Release screws (2).

Tightening torque: 11 11 3AZ, see 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

Fig 2: Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: 11 11 4AZ, see 11 11 CRANKCASE .

Release screws (2).

Tightening torque: 11 11 2AZ, see 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

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

Tightening torque: 11 11 1AZ, see 11 11 CRANKCASE .

Fig 3: Crankcase Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: 11 11 3AZ, see 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

Lift out bedplate.

Fig 4: Bedplate 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: Bearing Shells

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: Picture shows N46.

Fig 6: Adapter Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Insert crankshaft (1).

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

Fig 7: Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque: 11 11 1AZ, see 11 11 CRANKCASE .

Tighten screws (2) from inside outwards.

Tightening torque: 11 11 2AZ, see 11 11 CRANKCASE .

Tighten screws (1).

Tightening torque: 11 11 4AZ, see 11 11 CRANKCASE .

Installation:

Replace aluminum screws.

Fig 8: Crankcase Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

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: 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 .

Fig 10: Moving Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation:

Always replace nozzles (1).

Fig 11: Nozzles With Special Tool (11 9 360)

Courtesy of BMW OF NORTH AMERICA, INC.

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)

Courtesy of BMW OF NORTH AMERICA, INC.

Replace crankshaft radial seal at front, see 11 14 005 Replacing front crankshaft radial seal (N52K) .

Replace crankshaft radial seal (transmission side), see 11 14 151 Replacing crankshaft radial seal (transmission side) (N52K) .

Assemble engine.