11 21 500 Replacing crankshaft (N20, N26)

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Special tools required:

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on ASSEMBLY STAND .
Remove VIBRATION ABSORBER .
Remove oil sump . See 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N20, N26) or 11 13 000 REMOVING AND FITTING, SEALING OR REPLACING THE OIL SUMP (N20 ALL-WHEEL DRIVE VEHICLE) .
Remove OIL PUMP .
Remove timing CHAIN MODULE .
Remove CHAIN MODULE for oil pump.
Remove CYLINDER HEAD .
Remove FLYWHEEL .
Remove all PISTONS .

Release all screws (1).

Fig 1: Crankshaft Screws

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Undo screws (10 to 1) from the outside to the inside.

Fig 2: Crankcase Lower Section Bolts Tightening/Loosening Sequence (N20)

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Remove the crankcase lower section (1) in the direction of the arrow towards the top.

Fig 3: Removing Crankcase Lower Section

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IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 21 kg.

Fig 4: Installing Bearing Shells And Guide Bearing Shell

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Remove crankshaft (1) upward in direction of arrow.

Remove and replace (if applicable) BEARING SHELLS and guide bearing shells.

IMPORTANT: If the screw (1) is undone, the oil spray nozzle (2) must be readjusted.

Fig 5: Oil Spray Nozzle And Screw

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Installation note:

Setting the oil nozzle to the crankcase.

Place feeler gauge (2) between oil nozzle (1) and crankcase.

Fig 6: Placing Feeler Gauge Between Oil Nozzle And Crankcase

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Adjust feeler gauge to 0.40 mm.

Bring oil nozzle into contact with the feeler gauge by pressing lightly.

Tighten bolt (1).

Tightening torque: 11 11 3AZ .

Fig 7: Adjusting Feeler Gauge To Bolt

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Clean all sealing surfaces (1) with special tool 11 4 470 .

Insert all CRANKSHAFT MAIN BEARINGS .

Installation note:

Remove residue of seals from the crankcase (2).

Check fitting bushes (1) for damage and replace if applicable.

Oil all bearing points adequately with engine oil.

Fig 8: Residue Of Seals From Crankcase

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IMPORTANT: Insert crankshaft with aid of a second person.
Weight of crankshaft approx. 21 kg.

Insert crankshaft (1).

Fig 9: Installing Bearing Shells And Guide Bearing Shell

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Installation note:

Check durability of sealing compound, do not use sealing compound that has expired.

Maximum processing time of the SEALING COMPOUND 2.2 10 minutes.

Fig 10: Crankcase Lower Section Sealing Compound Applying Areas

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Apply sealing compound in the stated areas with a width of 2.0 to 2.6 mm.

Fit crankcase lower section (watch fitting bushes).

Fig 11: Fitting Crankcase Lower Section

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Fig 12: Crankcase Lower Section Bolts Tightening/Loosening Sequence (N20)

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Please observe the tightening sequence of the screws (1 to 10).

Join screws (1).

Fig 13: Tightening Crankcase Lower Section Screws

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Mark all screws (1) with a crosswise colored mark.

Fig 14: Crankcase Lower Section Screws Colored Mark

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Retighten all screws using special tools 00 9 120 .

Tightening torque: 11 11 1AZ .

Installation note:

After tightening all screws, the colored mark must be aligned in the same way.

Fig 15: Tightening Screws Using Special Tools (00 9 120)

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All screws (1) from the inside to the outside.

Tightening torque: 11 11 2AZ .

Fig 16: Tightening Screws

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Fit special tool 11 6 252 with magnetic foot on special tool 11 4 440.

Clamp special tool 11 6 251 on special tool 11 6 252 .

Position special tool 11 6 251 with button on the flat side of the crankshaft.

Press crankshaft (1) in direction of arrow up to stop.

Set dial gauge with knurled screw (2) on zero.

Fig 17: Setting Dial Gauge With Knurled Screw On Zero

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Press crankshaft (1) in direction of arrow from right to left up to stop.

Determine CRANKSHAFT AXIAL CLEARANCE .

Fig 18: Pressing Crankshaft From Stop

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Turn crankshaft (1) via the central bolt with special tool 00 2 010 to determine the COEFFICIENT OF FRICTION .

Graphic N55.

Fig 19: Turning Crankshaft Central Bolt With Special Tool (00 2 010)

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Replace front CRANKSHAFT SEAL .

Replace CRANKSHAFT SEAL (transmission side).

Assemble engine.