11 21 500 Replacing crankshaft (N20)

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

Special tools required:

11 4 470
00 9 120
11 6 252
11 4 440
11 6 251
00 2 010

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on ASSEMBLY STAND .
Remove VIBRATION ABSORBER .
Remove OIL SUMP .
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: Identifying Crankshaft Screws

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

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

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

Fig 3: Fitting Crankcase Lower Section

IMPORTANT: Remove crankshaft with aid of a second person.

Weight of crankshaft approx. 21 kg.

Remove crankshaft (1) upward in direction of arrow.

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

Fig 4: Inserting Crankshaft

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

Fig 5: Identifying Oil Spray Nozzle And Screw

Adjust oil spray nozzle (1) using a feeler gauge (2) in parallel to the crankcase.

Fig 6: Adjusting Oil Spray Using Feeler Gauge

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

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: Locating Crankcase Seals Residue

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

Insert crankshaft (1).

Fig 9: Inserting Crankshaft

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: Identifying Crankcase Lower Section Sealing Compound Applying Areas

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

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

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

Join screws (1).

Fig 13: Tightening Crankcase Screws

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

Fig 14: Identifying Crankcase Bolts Coloured Mark

Retighten all screws using special tools 00 9 120 .

Tightening torque 11 11 1AZ .

Installation note:

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

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

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

Tightening torque 11 11 2AZ .

Fig 16: Tightening Crankcase Aluminium Bolts

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: Pressing Crankshaft

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

Determine CRANKSHAFT AXIAL CLEARANCE .

Fig 18: Pressing Crankshaft

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

Illustration: N55.

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

Replace front CRANKSHAFT SEAL .

Replace CRANKSHAFT SEAL (transmission side).

Assemble engine.