BMW X5: Replacing All Main Crankshaft Bearing Shells(N52K)

Special tools required:

• 00 2 590 PLASTIGAGE (5)
• 11 4 251
• 11 4 252
• 11 4 470

IMPORTANT: Aluminium-magnesium materials.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

• Remove crankshaft.

Checking position of oil spray nozzles:

Insert special tool 11 4 251 in screw connection of main bearing.

NOTE: Special tool 11 4 252 must be pre-installed at the seventh main bearing.

Check position of oil spray nozzle (2) according to position (1) on special tool 11 4 251.

If necessary, adjust and secure oil spray nozzle (2).

Tightening torque: 11 11 5AZ.

Fig. 101: Oil Spray Nozzle, Special Tools (11 4 251) And (11 4 252)

Remove bearing shells (2) and guide bearing shell (3).

NOTE: Guide bearing shell (3) is a thrust bearing.

Observe bearing classification.

Fig. 102: Bearing Shells

Installation:

Bearing shell (1) with lubricant groove must be fitted in crankcase.

Bearing shell (2) without lubricant groove must be fitted in bedplate.

Fig. 103: Bearing Shells

IMPORTANT: It is not possible to remachine the crankshaft.

Surface (1) for marking.

Seven-digit part number (2).

Bearing classification (3) on bedplate (see table: values of 1/2/3).

Fig. 104: Bearing Classification On Bedplate

Bearing classification (1) on crankcase (see table: values of A/B/C).

Installation:

When all the letters and number code have been determined, the color of the bearing shells must be allocated (see table).

IMPORTANT: Excessively small bearing play will result in engine damage.

Possible color combinations (see table).

Fig. 105: Bearing Classification On Crankcase

BEARING SHELL COLOR COMBINATIONS SPECIFICATION

Install bearing shells (2) and guide bearing shell (3).

Installation:

Clean all sealing surfaces.

IMPORTANT: Do not use any metal-cutting tools.

Clean sealing faces with special tool 11 4 470 only.

Determine bearing play with special tool 00 2 590.

Installation:

All measuring points must be clean and free from oil and grease. If necessary, clean all measuring points.

Fig. 106: Bearing Shells

Use the existing screws to determine the bearing play.

Set up bedplate with bearing shells.

Remove bedplate.

Read off bearing play at width of flattened plastic thread and measurement scale.

Installation:

Remove plastic thread.

Apply a light coat of oil to bearing shells and crankshaft.

Fig. 107: Reading Bearing Play At Width Of Flattened Plastic Thread And Measurement Scale

Install bedplate Replacing crankshaft (N52K). Assemble engine.

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