Necessary preliminary tasks

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Remove CYLINDER HEAD .

Insert 11 4 430 special tool into bores.

Remove cylinder head seal.

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

B = gasoline engine
30= displacement (3 liters)

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

Fig 1: Inserting Special Tool (11 4 430) Into Bores

Courtesy of BMW OF NORTH AMERICA, INC.

There must be no fluids or contaminants in any of the threaded holes (1) for the cylinder head bolt connections.

IMPORTANT: Work on sealing surface on engine block and on cylinder head with special tool 11 4 470 only.
Do not use any metal-cutting tools.

Fig 2: Identifying Threaded Holes Of Cylinder Head Connections

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

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: Installing Cylinder Head Gasket On Engine Block

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check cylinder head for DEVIATION FROM FLATNESS .
Check cylinder head for WATER LEAKS .

Assemble engine.