11 21 500 Replacing crankshaft (N52K)

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

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 .
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
Remove OIL PUMP
Remove oil pump/vacuum pump CHAIN MODULE
Remove timing CHAIN MODULE
Remove CYLINDER HEAD
Remove FLYWHEEL
Removing all PISTONS

Release screws (1).

Tightening torque 11 13 6AZ .

Installation:

Replace aluminum screws.

Remove oil deflector (2).

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

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:

Replace aluminum screws.

Fig 2: Identifying Aluminum Screws

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Release screws (1).

Tightening torque 11 11 4AZ .

Unfasten screws (2).

Tightening torque 11 11 2AZ .

Installation:

Replace aluminum screws.

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

Tightening torque 11 11 1AZ .

Fig 3: Crankcase Bolts Tightening/Loosening Sequence

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Release screws (1).

Tightening torque 11 11 3AZ .

Installation:

Replace aluminum screws.

Lift out bedplate.

Fig 4: Identifying Crankshaft Screws

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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.

Clean all sealing faces with special tool 11 4 470.

Fig 5: Checking Bearing Play

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Check adapter sleeves (1) for damage and secure seating; replace if necessary.

Install all BEARING SHELLS .

Installation:

Lubricate all bearing points with engine oil.

NOTE: Graphic shows N46.

Fig 6: Identifying Adapter Sleeves

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Insert crankshaft (1).

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

Fig 7: Identifying Crankshaft

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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:

Replace aluminum screws.

Fig 8: Crankcase Bolts Tightening/Loosening Sequence

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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 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 . See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS N52K/B30 ; CRANKSHAFT AND BEARINGS N52K/B25 ; CRANKSHAFT AND BEARINGS N52K/B30 or CRANKSHAFT AND BEARINGS N52K/B25 .

Fig 10: Moving Crankshaft Using Special Tool (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: Driving Nozzles In Crankcase Using Special Tool (11 9 360)

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Replace CRANKSHAFT RADIAL SEAL at front.

Replace CRANKSHAFT RADIAL SEAL (transmission side).

Installation:

Use PRIMER 1.3 AND LIQUID GASKET 1.4 .

Prepare liquid gasket (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 gasket (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 gasket with primer 1.3.

(Picture shows N40).

Fig 14: Coating Housing Partition On Engine Block Using Brush Moistened With Loctite Primer

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Assemble engine.