BMW X5 Owners & Service Manuals

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

Special tools required:

IMPORTANT: Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released.

The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.

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

Necessary preliminary tasks:

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.

Crankshaft With Bearing
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.

Crankshaft With Bearing
Fig. 102: Bearing Shells


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

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

Crankshaft With Bearing
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).

Crankshaft With Bearing
Fig. 104: Bearing Classification On Bedplate

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


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.

The color combination Yellow and Red must not be fitted.

Possible color combinations (see table).

Crankshaft With Bearing
Fig. 105: Bearing Classification On Crankcase


Crankshaft With Bearing

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


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.


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

Crankshaft With Bearing
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.


Remove plastic thread.

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

Crankshaft With Bearing
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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