11 21 500 Replacing crankshaft (N12)

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

WARNING: Rotating components (danger or injury!).
It is absolutely essential to follow the procedure described below and the instructions on handling the special tools.

IMPORTANT: 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 timing chain.
Remove CYLINDER HEAD .
Remove FLYWHEEL .

Release screws (1).

Tightening torque: 11 13 5AZ .

Remove oil deflector (2).

Remove all PISTONS .

Fig 1: Identifying Screws And Oil Deflector

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Drive out cover plates (1) with a cross-chisel (2).

Fig 2: Removing Cover Plates Using Cross-Chisel

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Release screws (26 to 11).

Release screws (10 to 1).

Fig 3: Crankcase Bolts Tightening Sequence

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Release crankcase lower half in direction of arrow with a regular screwdriver (2) and an open-end wrench (1) at press-off lug.

Fig 4: Removing Crankcase Lower Half Using Screwdriver

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Remove both radial shaft seals (1).

Fig 5: Identifying Crankshaft Radial Seals

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Remove crankshaft (1).

IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 19 kg.

Remove MAIN BEARING SHELLS , replace if necessary.

Fig 6: Identifying Crankshaft

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IMPORTANT: Do not clean sealing faces with a metal-cutting tool.

Clean sealing faces with special tools 11 4 471 and 11 4 472.

Fig 7: Cleaning Sealing Faces Using Special Tools (11 4 471) And (11 4 472)

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

Fig 8: Identifying Adapter Sleeves

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Apply sealing bead (1) to crankcase lower half (see picture) with Loctite 5970 sealing compound.

Installation:

Follow manufacturer's instructions (Loctite).

Fig 9: Identifying Sealing Bead On Crankcase Lower Section

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Apply sealing bead (1) to crankcase upper half (see picture) with Loctite 5970 sealing compound.

Apply a light coating of engine oil to bearings.

Fig 10: Identifying Sealing Bead On Crankcase Upper Section

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Insert crankshaft (1).

IMPORTANT: Rotating component (danger of injury!)
Insert crankshaft with aid of a second person.
Weight of crankshaft approx. 19 kg.

Fig 11: Identifying Crankshaft

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Lubricate all bearings from 1 to 5 with engine oil.

Install crankcase lower half.

Fig 12: Identifying Bearings For Lubrication

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Tighten bolts (1 to 10).

Tightening torque: 11 11 1AZ .

Tighten bolts (11 to 26).

Tightening torque: 11 11 2AZ .

Fig 13: Crankcase Bolts Tightening Sequence

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Tighten bolts exclusively with special tool 00 9 120 .

IMPORTANT: Jointing torque and angle of rotation must be observed without fail.

Fig 14: Tightening Bolts Using Special Tool (00 9 120)

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To prevent oil leakage, apply a thin coating of Loctite 273 to cover sleeve (1) in area (2).

Fig 15: Identifying Loctite 273 Coating Area On Contact Sleeve

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Drive cover sleeves firmly home with special tool 23 1 240.

Fig 16: Identifying Cover Sleeves Firmly Home With Special Tool 23 1 240

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Determine crankshaft axial clearance.

Attach special tool 11 6 252 with magnet.

Set special tool 11 6 251 to zero.

Press crankshaft in direction of rotation up to stop.

Fig 17: Identifying Oil Deflector With Screws

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Replace radial shaft seal at FRONT .

Replace radial shaft seal at REAR .

Assemble engine.