11 12 101 Replacing Cylinder Head Gasket (N52K)

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Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS (N52K) .

11 4 430
11 4 470

IMPORTANT: Aluminum-magnesium materials. No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. Aluminum screws/bolts must be replaced each time they are released. Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic . Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove cylinder head. See 11 12 100 REMOVING AND INSTALLING CYLINDER HEAD (N52K) .

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 1: Identifying Special Tool (11 4 430)

G04751049

Courtesy of BMW OF NORTH AMERICA, INC.

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 2: Identifying Pocket Holes

G04751050

Courtesy of BMW OF NORTH AMERICA, INC.

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 3: Identifying Rubber Coating On Cylinder Head Gasket

G04751051

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 4: Placing Cylinder Head Gasket

G04751052

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check cylinder head for deviation from flatness. See 11 12 719 RESURFACING CYLINDER HEAD SEALING FACE (N52K) . Check cylinder head for water leaks. See 11 12 729 CHECKING CYLINDER HEAD FOR WATER LEAKS (N52K) .

Assemble engine.