Removal & Installation

(piston removed)

IMPORTANT: Note grinding stages on crankshaft.

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

Fig 1: Replacing Connecting Rod Bearings

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Check conrod bearing clearance. See ENGINE - TECHNICAL DATA - 525I & 530I .

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.

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

Fig 4: Reading Off Bearing Play At Width Of Flattened Plastic Thread

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