BMW X5 Owners & Service Manuals

BMW X5: Replacing Cylinder Head Gasket (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:

Insert special tool 11 4 430 into bores.

Remove cylinder head seal.

IMPORTANT: Check marking (1) on cylinder head gasket (B25 or B30).

Do not mix them up as this will cause engine damage.

Cylinder Head With Cover
Fig. 42: Special Tool (11 4 430)

Remove remnants of oil and dirt from pocket holes (1).

IMPORTANT: Work on sealing face on engine block and on cylinder head with special tool 11 4 470 only.

Do not use any metal-cutting tools.

Cylinder Head With Cover
Fig. 43: Pocket Holes

IMPORTANT: Rubber coating (2) on cylinder head gasket (3) must not under any circumstances be damaged (electrochemical corrosion).

Cylinder head gasket (3) is a sheet-metal gasket.

Cylinder Head With Cover
Fig. 44: Rubber Coating And Cylinder Head Gasket

Check adapter sleeves (1) for damage and firm seating.

Place cylinder head gasket (2) in direction of arrow on engine block.

Cylinder Head With Cover
Fig. 45: Cylinder Head Gasket And Adapter Sleeves

NOTE: Check cylinder head for deviation from flatness.

Check cylinder head for water leaks.

Assemble engine.

RESURFACING CYLINDER HEAD SEALING FACE (N52K)

Necessary preliminary tasks:

Check evenness of cylinder head sealing faces with a standard straight-edge (1).

NOTE: Max. deviation from level (longitudinal) 0.10 mm

Cylinder Head With Cover
Fig. 46: Standard Straight-Edge On Cylinder Head Sealing Faces

Check evenness of cylinder head sealing faces with a standard straight-edge (1).

NOTE: Max. deviation from level (transversal) 0.05 mm

Cylinder Head With Cover
Fig. 47: Standard Straight-Edge On Cylinder Head Sealing Faces

Check cylinder head for water leaks.

Assemble engine.

CHECKING CYLINDER HEAD FOR WATER LEAKS (N52K)

Special tools required:

IMPORTANT: Pressure-test cylinder head to max. 3 bar.

Heat cylinder head to 60º.

Check for bubble formation in a water bath.

Necessary preliminary tasks:

NOTE: Observe mounting of special tool 11 4 341 on cylinder.

Secure special tool 11 4 341 with bolts 11 4 345 to 25 Nm.

Cylinder Head With Cover
Fig. 48: Cylinder Head

Install special tool 11 4 341 with special tool 11 4 345.

Installation:

Cylinder no. 1 is marked.

Cylinder Head With Cover
Fig. 49: Special Tool (11 4 341)

Fit special tool 11 4 342 with bolts (1). Screw in knurled screw in direction of arrow.

Sealing flange must rest flat.

Cylinder Head With Cover
Fig. 50: Special Tool (11 4 342) With Bolts

Secure special tool 11 4 344 with bolts (1).

NOTE: Compressed air at valve max. 3 bar.

Heat cylinder head to 60º.

Check for bubble formation in a water bath.

Cylinder Head With Cover
Fig. 51: Special Tool (11 4 344) With Bolts

Assemble engine.

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