11 21 500 Replacing crankshaft (N54, N54T)

Special tools required:

IMPORTANT: 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 .
Mount engine on ASSEMBLY STAND .
Remove VIBRATION DAMPER .
Remove oil sump . See 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N54, N54T) or 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N54) ALL-WHEEL DRIVE VEHICLE .
Remove OIL PUMP .
Remove TRIANGULAR DRIVE for oil pump.
Remove TIMING CHAIN MODULE .
Remove CYLINDER HEAD .
Remove FLYWHEEL .
Removing all PISTONS .

Release screws (1).

Tightening torque: 11 13 5AZ .

Installation note:

Replace aluminum screws.

Remove oil deflector (2).

Fig 1: Identifying Oil Deflector Screws

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Release screws (1).

Tightening torque: 11 11 2AZ .

Unfasten screws (2).

Tightening torque: 11 11 3AZ .

Installation note:

Replace aluminum screws.

Fig 2: Identifying Oil Deflector Aluminum Screws

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Release screws (1).

Tightening torque: 11 11 4AZ .

Unfasten screws (2).

Tightening torque: 11 11 2AZ .

Installation note:

Replace aluminum screws.

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

Tightening torque: 11 11 1AZ .

Fig 3: Identifying Crankcase Lower Section Steel Screws

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Release screws (1).

Tightening torque: 11 11 3AZ .

Installation note:

Replace aluminum screws.

Remove crankshaft lower section in upward direction.

Fig 4: Identifying Crankcase Lower Section Screws

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Remove both crankshaft seals (1).

NOTE: Graphic shows N46.

Fig 5: Identifying Crankshaft 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. 25 kilograms.

Fig 6: Removing/Installing Crankshaft

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Check fitting bush (1) for damage and correct seating.

Reinstall crankshaft.

Installation note:

Lubricate all bearing positions with engine oil.

Clean all sealing surfaces.

NOTE: Graphic shows N46.

Fig 7: Identifying Crankshaft Main Bearings Bushes

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

Tightening torque: 11 11 1AZ .

Tighten screws (2) from inside outwards.

Tightening torque: 11 11 2AZ .

Tighten screws (1).

Tightening torque: 11 11 4AZ .

Installation note:

Replace aluminum screws.

Fig 8: Identifying Crankcase Lower Section Steel Screws

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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: Tightening Aluminum Screws Using 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. See ENGINE - TECHNICAL DATA - E92 .

Fig 10: Positioning Special Tool (00 2 510) On Crankshaft

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Installation note:

Always replace nozzles (1).

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

Fig 11: Installing Injector Nozzles Using Special Tool (11 9 360)

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Installation note:

CRANKSHAFT SEAL - replace front.

CRANKSHAFT SEAL - replace rear .

Installation note:

Use PRIMER 1.3 AND LIQUID GASKET 1.4 .

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

Screw on nozzle for injecting liquid gasket.

Fig 12: Identifying Sealing Caps, Injector And Syringe

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

Fig 13: Inserting Liquid Sealing Compound Using Special Tool (11 4 370)

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Stop (seal off) escaping liquid sealing compound with primer 1.3.

(Graphic shows N40).

Fig 14: Applying Liquid Sealing Compound

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Assemble engine.