11 12 101 Replacing cylinder head gasket (N51)

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Special tools required:

11 4 430
11 4 470

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 .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminium 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 .

Insert special tool 11 4 430 into bores.

Remove head gasket.

IMPORTANT: Check identification (1) on cylinder head gasket (N51).

Fig 1: Special Tool (11 4 430) And Cylinder Head Gasket Marking

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: Cylinder Head Pocket Holes

G04751050

Courtesy of BMW OF NORTH AMERICA, INC.

Identification (1) of head gasket.

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: Cylinder Head Gasket, Gasket Identification And Rubber Coating

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: Adapter Sleeves And Cylinder Head Gasket

G04751052

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check cylinder head for Deviation From Flatness .

Check cylinder head for Water Leaks .

Assemble engine.