11 21 500 Replacing crankshaft (N55 hybrid)

Special tools required:

WARNING: Compliance with the following points is mandatory before beginning work:

Observe SAFETY INFORMATION for working with electric vehicles.

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 work:

Remove engine
Mount engine on ASSEMBLY STAND .
Remove VIBRATION ABSORBER .
Remove OIL SUMP .
Remove oil pump.
Remove timing CHAIN MODULE .
Remove oil pump/vacuum pump chain module.
Remove CYLINDER HEAD .
Remove FLYWHEEL .
Remove 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 Aluminum Screws

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Release aluminum screws (1).

Installation note:

Replace aluminum screws.

NOTE: Graphic shows N52.

Fig 3: Identifying Crankshaft Screws

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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: Crankcase Bolts Tightening/Loosening Sequence

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

Remove crankshaft (1) upward in direction of arrow.

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

Fig 5: Identifying Crankshaft And Main Bearing Shells

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

Fig 6: Identifying Crankcase 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 Sleeves

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

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

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

JOIN steel bolts (1).

Fig 10: Tightening Crankcase Steel Bolts

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

Fig 11: Identifying Steel Bolts 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 Bolt Using Special Tools (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 Colored Mark

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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 Crankcase Aluminum Bolts

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

Fig 15: Identifying Aluminum Bolts 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

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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: Pressing Crankshaft

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

Determine CRANKSHAFT AXIAL CLEARANCE .

Fig 18: Pressing Crankshaft

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Turn crankshaft (1) via the central bolt with special tool 00 2 010 to determine the COEFFICIENT OF FRICTION .

Fig 19: Turning Crankshaft

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Drive both injector nozzles (1) on left and right on crankcase into the bore hole (see arrow) with special tool 11 9 360 .

Installation note:

Replace injector nozzles (1).

Fig 20: Locating Injector Nozzles

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

Fig 21: Installing Injector Nozzles

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Drive injector nozzle (1) all the way in.

Fig 22: Identifying Injector Nozzle

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Installation note:

Use PRIMER 1.3 AND LIQUID SEALING COMPOUND 1.4 .

Prepare liquid sealing compound (2) in special tool 11 4 370 .

Screw on nozzle (1) for injecting sealing compound.

Fig 23: Identifying Liquid Sealing Compound And Nozzle

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Slowly and evenly insert liquid sealing compound (1) via the injector nozzle with special tool 11 4 370 in direction of arrow.

Graphic N42.

Fig 24: Inserting Liquid Gasket Using Special Tool (11 4 370)

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Replace crankshaft seal at front.

Replace CRANKSHAFT RADIAL SEAL (transmission side).

Assemble engine.