BMW X5: Replacing Cylinder Head Gasket (N52K)

Special tools required:

• 11 4 430
• 11 4 470

IMPORTANT: Aluminium-magnesium materials.

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:

• Remove cylinder head.

Insert special tool 11 4 430 into bores.

Remove cylinder head seal.

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

• B = petrol/gasoline engine
• 30= displacement (3 liters)

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

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.

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.

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.

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:

• Remove cylinder head.
• Remove exhaust camshaft.
• Remove intermediate lever on inlet side.

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

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

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

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:

• 11 4 341
• 11 4 342
• 11 4 344
• 11 4 345

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

Check for bubble formation in a water bath.

Necessary preliminary tasks:

• Remove cylinder head
• Disassemble cylinder head

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.

Fig. 48: Cylinder Head

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

Installation:

Cylinder no. 1 is marked.

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.

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.

Check for bubble formation in a water bath.

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

Assemble engine.

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