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).

Fig 1: Identifying Crank Pin And Arrow

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Example: 

Possible classification: rbbrrb

Cylinder Classification Red / Red

1:

Cylinder Classification Blue / Blue

2:

Cylinder Classification Blue / Blue

3:

Cylinder Classification Red / Red

4:

Cylinder Classification Red / Red

5:

Cylinder Classification Blue / Blue

6:

Release conrod bolts (1).

Remove connecting rod bearing cap (2).

Fig 2: Identifying 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: Identifying Connecting Rod Bearing Shells

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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: Identifying Connecting Rod Bearing

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Use the old conrod bolts to check conrod clearance.

Tighten down conrod bolts with special tool 00 9 120  .

Tightening torque 11 24 1AZ .

Fig 5: Identifying 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  .

Tightening torque 11 24 1AZ .

Fig 6: Checking Conrod Bearing Play

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Assemble engine.