11 21 500 Replacing crankshaft (N14)

Special tools required:

00 9 120
11 4 471
11 4 472
11 6 251
11 6 252
23 1 240

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.
Remove 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 Oil Deflector And Screws

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

Fig 2: Driving Out Cover Plates With Cross-Chisel

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Release screws (28 to 11).

Release screws (10 to 1).

Fig 3: Identifying Screws 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: Releasing Crankcase Lower Half

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Remove both radial shaft seals (1).

Fig 5: Identifying Radial Shaft 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: Identifying 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 Guide Sleeves

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

Installation:

Follow manufacturer's instructions (Loctite).

Fig 9: Identifying Sealing Bead Applying Area (1 Of 2)

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

Installation:

Follow manufacturer's instructions (Loctite).

Fig 10: Identifying Sealing Bead Applying Area (2 Of 2)

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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 (1)

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Lubricate all bearings from 1 to 5 with engine oil.

Install crankcase lower half.

Fig 12: Identifying Crankshaft Bearings Position

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Tighten bolts (1 to 10).

Tightening torque 11 11 1AZ

Tighten bolts (11 to 28).

Tightening torque 11 11 2AZ

Fig 13: Identifying 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: Identifying 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 Cover Sleeve

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

Fig 16: Installing Cover Sleeves With Special Tool

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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.

Refer to TECHNICAL DATA .

Fig 17: Attaching Special Tool (11 6 252)

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Replace radial shaft seal at front. See REPLACING FRONT CRANKSHAFT RADIAL SEAL .

Replace radial shaft seal at rear. See REPLACING CRANKSHAFT RADIAL SEAL .

Assemble engine.