11 21 531 Replacing all crankshaft main bearing shells (N63 hybrid drive)

Special tools required: 

• 00 2 590
• 00 9 120
• 11 6 251
• 11 6 252

Necessary preliminary tasks:

• Remove CRANKSHAFT 

Fig 1: Orientation Of Main Bearing Caps

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The letters denote the bearing shell classification for the relevant bearing position from 1 to 5 (main bearing cap).

The first letter on the left applies to the first bearing position at the front on the timing chain drive.

Color assignment on crankshaft 1 to 5

Fig 2: Identifying Bearing Shell Classification

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Installation note: 

Install main bearing shells (1) with lubrication groove in crankcase.

Install main bearing shells (2) without lubrication groove in the main bearing caps.

Fig 3: Identifying Main Bearing Shells

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Fig 4: Identifying Main Bearing Cap Surface

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Turn back thread support bushing into main bearing cap.

Fig 5: Turning Thread Support Bushing

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Checking main bearing clearance:

To check crankshaft bearing play, use the existing main bearing bolts.

Do not twist crankshaft.

Place special tool 00 2 590 (Plastigage model PG 1) onto the oil-free crankshaft (see arrow in illustration).

Fig 6: Checking Main Bearing Clearance

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Tighten down all collar bolts (M11) of main bearing caps in sequence 1 to 10 to jointing torque.

Tightening torque 11 11 1AZ .

Fig 7: Crankshaft Bolts (M11) Tightening/Loosening Sequence

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Tighten down all collar bolts (M11) of main bearing caps with special tool 00 9 120 with angle of rotation.

Fig 8: Securing Collar Bolt Using Special Tool (00 9 120)

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Remove main bearing cap.

Read off main bearing clearance at width of flattened plastic thread with assistance of measurement scale.

Main bearing clearance. See CRANKSHAFT AND BEARINGS .

• Remove plastic thread
• Apply a coat of oil to new bearing shells and crankshaft
  Fig 9: Measuring Main Bearing Clearance

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Install CRANKSHAFT .

Carefully strike back and front of crankshaft with a plastic hammer to center guide bearing (do not damage crankshaft).

Secure special tool 11 6 252 with magnetic foot on crankcase.

Position special tool 11 6 251 .

Tightening specifications for main bearing:

Check SIDE CLEARANCE .

Check guide bearing shell, crankshaft and crankcase if necessary.

Fig 10: Checking Crankshaft Axial Play Using Special Tool

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Assemble engine.