11 21 531 Replacing crankshaft main bearing shells W10

Special Tools Required: 

• 00 2 590
• 00 9 120

Necessary Preliminary Tasks: 

• Remove engine. Refer to 11 00 050 REMOVING AND INSTALLING ENGINE .
• Remove gearbox. Refer to REMOVAL & INSTALLATION - AUTOMATIC TRANSMISSION .
• Remove cylinder head. Refer to 11 12 100 REMOVING AND INSTALLING/SEALING CYLINDER HEAD W10 .
• Remove timing chain. Refer to 11 31 051 REPLACING TIMING CHAIN .
• Remove oil sump. Refer to 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP .
• Remove crankshaft radial seal. Refer to 11 14 151 REPLACING CRANKSHAFT RADIAL SEAL .

Release screws (1).

Remove oil intake pipe (2).

Installation: 

Replace O-ring (3).

Apply petroleum jelly to O-ring (3)

Fig 1: Removing Oil Intake Pipe

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Undo crankcase bolts along the lines (2) shown, working from the outside towards the inside.

Undo crankcase bolts along the lines (1) shown, working from the outside towards the inside.

Detach bottom section of crankcase.

Fig 2: Removing Crankcase Bolts

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Remove crankcase (1) by lifting up in direction indicated by arrow.

Installation: 

Clean sealing surfaces.

Check fitted sleeves for damage and replace if necessary.

Fig 3: Removing Crankcase

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Installation: 

Install main bearing shell with lubrication groove (1) in top section of crankcase.

Install main bearing shell without lubrication groove (2) in bottom section of crankcase.

Fig 4: Identifying Types Of Main Bearing Shells

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Checking Main Bearing Clearance: 

To check crankshaft bearing clearance, use old main bearing screws.

There must be no oil in the blind holes (risk of cracking).

Do not twist crankshaft.

Place special tool 00 2 590 (Plastigage model PG 1) on oil-free crankshaft.

Fig 5: Locating Blind Holes

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1. Tighten down all bolts in crankcase to jointing torque.
2. Tighten down all bolts in crankcase with special tool 00 9 120 to torsion angle.

Installation: 

Tightening torque, refer to 11 11 2AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Fig 6: Tightening Bolts Of Crankcase With Special Tool 00 9 120

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Remove crankcase.

Read off main bearing clearance with measuring scale.

Main bearing play.

• Remove plastic thread.
• Lubricate bearing shells and bearing shells.

Installation: 

Always replace main bearing bolts.

Do not wash off bolt coating.

There must be no oil in the blind holes (risk of cracking).

Fig 7: Reading Off Main Bearing Clearance With Measuring Scale

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Install bearing shells with lubrication groove (1) in top section of crankcase.

Installation: 

Main bearing shell (2) is a thrust bearing and is mounted in the center of the upper section of the crankcase.

See Fig 8.

Fig 8: Installing Main Bearing Shell

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Installation: 

Apply bead of sealing compound (1).

Apply Loctite liquid sealant 518 thinly and evenly to sealing surfaces.

See Fig 9.

Fig 9: Applying Bead Of Sealing Compound

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Install crankshaft.

Mount bottom section of crankcase.

Fit screws 1 to 10.

Tightening torque: 11 11 1AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Fit screws 11 to 20.

Tightening torque: 11 11 2AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Fig 10: Installing Crankshaft Bolts

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Checking Axial Clearance: 

Push onto crankshaft (1) in direction of arrow with plastic hammer at rear and front in order to center guide bearing.

Axial clearance: refer to ENGINE - TECHNICAL DATA - COOPER (1.6L) R50/W10 .

Fig 11: Checking Axial Clearance

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Assemble engine.