Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

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 Blue & Red Bearing Shell

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Install piston.

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: Fitting Bearing Caps So That Pair Numbers Match Up

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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 112 110.

Tightening torque. Refer to ENGINE - TIGHTENING TORQUES .

Fig 3: Tightening Down Conrod Bolts

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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. Refer to ENGINE - TIGHTENING TORQUES .

Fig 4: Removing Bearing Cap & Read Off Bearing Play At Width Of Flattened Plastic Thread With Assistance Of Measurement Scale

Courtesy of BMW OF NORTH AMERICA, INC.