11 21 500 Replacing crankshaft (N54)

Special tools required:

IMPORTANT: Aluminium screws/bolts must be replaced each time they are released .
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium 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
Remove OIL PUMP
Remove TRIANGULAR DRIVE for oil pump
Remove TIMING CHAIN MODULE
Remove CYLINDER HEAD .
Remove FLYWHEEL
Remove all PISTONS

Release screws (1).

Tightening torque 11 13 5AZ .

Installation note:

Replace aluminium screws.

Remove oil deflector (2).

Fig 1: Identifying Oil Deflector And Screws

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Release screws (1).

Tightening torque 11 11 2AZ .

Unfasten screws (2).

Tightening torque 11 11 3AZ .

Installation note:

Replace aluminium screws.

Fig 2: Identifying Aluminium Screws

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Release screws (1).

Tightening torque 11 11 4AZ .

Unfasten screws (2).

Tightening torque 11 11 2AZ .

Installation note:

Replace aluminium screws.

Fig 3: Crankcase Bolts Tightening/Loosening Sequence

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

Tightening torque 11 11 1AZ .

Release screws (1).

Tightening torque 11 11 3AZ .

Installation note:

Replace aluminium screws.

Fig 4: Identifying Aluminium Screws

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Remove crankshaft lower section in upward direction.

Remove both crankshaft seals (1).

NOTE: Illustration shows N46 engine.

Fig 5: Identifying Crankshaft Radial 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: Identifying Bearing Shells

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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.

Fig 7: Identifying Guide Sleeves

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NOTE: Illustration shows N46 engine.

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:

Fig 8: Crankcase Bolts Tightening/Loosening Sequence

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Replace aluminium screws.

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: Tightening Bolts 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 .

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

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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 Injector, Sealing Compound And Bottle

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

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

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

Illustration shows N40 engine.

Fig 14: Applying Loctite Primer On Crankshaft Seal Grooves

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Assemble engine.