11 21 500 Replacing crankshaft (N52)

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Special tools required:

00 2 510
00 9 120
11 4 370
11 4 440
11 9 360

IMPORTANT: Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released.

The end faces of aluminium 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.
Remove Vibration Damper .
Removing Oil Pan.
Remove Oil Pump.
Remove Triangular Drive for oil pump.
Remove Timing Chain Module.
Remove Cylinder Head.
Remove Flywheel.
Remove all Pistons.

Release screws (1).

For tightening torque refer to 11 13 5AZ in 11 13 OIL PAN (N52) .

Installation:

Replace aluminium screws.

Remove oil deflector (2).

Fig 1: Identifying Oil Deflector And Mounting Screws

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Release screws (1).

For tightening torque refer to 11 11 2AZ in 11 11 ENGINE BLOCK (N52) .

Release screws (2).

For tightening torque refer to 11 11 3AZ in 11 11 ENGINE BLOCK (N52) .

Installation:

Replace aluminium screws.

Fig 2: Identifying Engine Screws

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Release screws (1).

For tightening torque refer to 11 11 2AZ in 11 11 ENGINE BLOCK (N52) .

Release screws (2).

For tightening torque refer to 11 11 4AZ in 11 11 ENGINE BLOCK (N52) .

Installation:

Replace aluminium screws.

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

For tightening torque refer to 11 11 1AZ in 11 11 ENGINE BLOCK (N52) .

Fig 3: Crankshaft Bolts Tightening/Loosening Sequence

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Release screws (1).

For tightening torque refer to 11 11 3AZ in 11 11 ENGINE BLOCK (N52) .

Installation:

Replace aluminium screws.

Lift out bedplate.

Fig 4: Identifying Radial Shaft Mounting Screws

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Remove both radial shaft seals (1).

NOTE: Illustrations show N46.

Fig 5: Identifying Radial Shaft Seals

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Remove Main Bearing Shells (2 and 3), replace if necessary.

Remove and install crankshaft (1) in direction of arrow.

IMPORTANT: Remove crankshaft with aid of a second person.

Weight of crankshaft approx. 23 kg.

Fig 6: Identifying Main Bearing Shells And Crankshaft

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Check guide sleeves (1) for damage and correct seating.

Reinstall crankshaft.

Installation:

Lubricate all bearing points with engine oil.

Clean all sealing surfaces.

NOTE: Illustrations show N46.

Fig 7: Identifying Crankshaft Guide Sleeves

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

For tightening torque refer to 11 11 1AZ in 11 11 ENGINE BLOCK (N52) .

Tighten screws (2) from inside outwards.

For tightening torque refer to 11 11 4AZ in 11 11 ENGINE BLOCK (N52) .

Tighten screws (1).

For tightening torque refer to 11 11 2AZ in 11 11 ENGINE BLOCK (N52) .

Installation:

Replace aluminium screws.

Fig 8: Crankshaft Bolts Tightening/Loosening Sequence

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Tighten aluminium screws exclusively with special tool 00 9 120.

IMPORTANT: In the case of aluminium 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 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: Identifying Special Tool (00 2 510) And (11 4 440)

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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 Special Tool (11 9 360) And Crankcase Nozzle

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Installation:

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

Screw on nozzle for injecting sealing compound.

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

Fig 12: Identifying Special Tool (11 4 370)

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Replace radial shaft seal at Front.

Replace radial shaft seal at Rear.

Assemble engine.