11 24 571 Replacing all connecting rod bearing shells (N52K)

Special tools required: 

• 00 2 590
• 00 9 120

Necessary preliminary tasks: 

• Remove Oil Sump 

Possible classifications per connecting rod at top and bottom:

• r: Red
• b: Blue

Only one color may be fitted per big end bearing cap and connecting rod.

In direction of arrow from (1 to 2) crank pin (1 to 6).

Example: 

Possible classification: rbbrrb

1. Cylinder Classification Red / Red
2. Cylinder Classification Blue / Blue
3. Cylinder Classification Blue / Blue
4. Cylinder Classification Red / Red
5. Cylinder Classification Red / Red
6. Cylinder Classification Blue / Blue

Fig 1: Big End Bearing Cap Mark

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Release conrod bolts (1).

Remove connecting rod bearing cap (2).

Fig 2: Connecting Rod Bearing Cap And Conrod Bolts

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Gently release connecting rod from crankshaft.

Remove connecting rod bearing shells (1 and 2).

Install new conrod bearing shells.

Installation: 

Pay attention to guide lugs during installation.

Fig 3: Connecting Rod Bearing Shells And Connecting Rod

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In each case insert only one color of connecting rod bearing shell (1 and 2) for each connecting rod.

Check conrod bearing clearance.

Piston in BDC position.

To determine the connecting rod bearing play, make sure that the bearing points are clean and free from oil and grease.

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

Fit conrod bearing cap so that pairing letters match up.

Fig 4: Locating Bearing Cap

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Use the old conrod bolts to check conrod clearance.

Tighten down conrod bolts with special tool 00 9 120.

For tightening torque refer to 11 24 1AZ in 11 24 CONNECTING RODS AND BEARINGS .

Fig 5: Special Tool (00 9 120)

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Unscrew conrod bearing cover. Read off conrod bearing play at width of flattened plastic thread on measurement scale.

Conrod Bearing Clearance .

• Remove Plastigage
• Coat crankshaft and connecting rod bearing shells with oil
• Install new conrod bolts and tighten down with special tool 00 9 120.

For tightening torque refer to 11 24 1AZ in 11 24 CONNECTING RODS AND BEARINGS .

Fig 6: Checking Bearing Play

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Assemble engine.