11 24 571 Replacing All Connecting Rod Bearings (S85)

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Special tools required:

00 9 120

IMPORTANT: Note grinding stages on crankshaft. See ENGINE - TECHNICAL DATA .

Necessary preliminary tasks:

Remove all pistons .

Install new conrod bearing shells.

Installation:

Install one blue (1) and one red (2) bearing shell in each conrod.

Install all pistons.

Fig 1: Identifying One Blue And One Red Bearing Shell

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NOTE: Check conrod bearing clearance.

Piston in BDC position.

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

Place bearing caps in position, making sure that matching numbers are paired.

Fig 2: Locating Bearing Caps

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IMPORTANT: Do not distort conrods or crankshaft.

Use the old conrod bearing bolts to check conrod clearance.

Tighten down conrod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ. See CONNECTING RODS AND BEARINGS .

Fig 3: Identifying Special Tool 00 9 120

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Remove conrod bearing cap and read off bearing clearance at width of pinched plastic thread on measuring scale.

Conrod bearing clearance: Refer to ENGINE - TECHNICAL DATA .

Remove plastic thread.
Lubricate crankshaft and bearing shells.
Install new conrod bolts and tighten down.

Tightening torque 11 24 1AZ. See CONNECTING RODS AND BEARINGS .

Fig 4: Identifying Plastic Thread (Plastigage)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.