11 24 571 Replacing all connecting rod bearings (M52 / S52 / M52TU / M54 / M56)

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 2 590
00 9 120
11 2 110

(piston removed)

IMPORTANT: Note grinding stages on crankshaft.

Install new conrod bearing shells.

Insert one blue (1) and one red (2) bearing shell (irrespective of the color coding on the conrod shaft).

Fig 1: Inserting Bearing Shell

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Install piston . See 11 25 530 Removing And Installing Or Replacing All Pistons (M52 / S52 / M52TU / M54 / M56) .

Check conrod bearing clearance.

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage Type PG 1) to oil-free crankshaft.

Fit bearing caps so that pair numbers match up.

Fig 2: Checking Conrod Bearing Clearance

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IMPORTANT: Do not distort conrods or crankshaft.

Use the old conrod bolts to check conrod clearance.

Tighten down conrod bolts with special tool 00 9 120 or with special tool 11 2 110.

Tightening torque, see 11 24 1AZ in ENGINE - TIGHTENING TORQUES .

Fig 3: Tightening Down Conrod Bolts With Special Tool

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Remove bearing cap and read off bearing play at width of flattened plastic thread with assistance of measurement scale.

Conrod bearing clearance .

Remove plastic thread.
Coat crankshaft and bearing shells with oil.
Install new conrod bolts and tighten down.

Tightening torque, see 11 24 1AZ in ENGINE - TIGHTENING TORQUES .

Fig 4: Removing Plastic Thread

Courtesy of BMW OF NORTH AMERICA, INC.