11 12 100 Removing and installing cylinder head (N55)

Special tools required: 

• 11 0 320
• 11 4 420
• 11 4 430
• 11 4 471
• 11 4 472
• 11 8 580

Necessary preliminary tasks: 

• Remove EXHAUST SYSTEM .
• Drain COOLANT .
• Drain ENGINE OIL .
• Remove ENGINE .
• Mount engine on ASSEMBLY STAND .
• Remove intake PLENUM .
• Remove EXHAUST TURBOCHARGER  with integrated exhaust manifold.
• Detach coolant hoses from cylinder head.
• Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Release screws (1).

Unclip timing chain module (2) at separation point (3) and remove towards top.

Set down timing chain.

Fig 1: Identifying Timing Chain Module, Separation Point And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 11 12 3AZ .

Release screw (2).

Tightening torque 11 12 3AZ .

Fig 2: Identifying Timing Chain Module Bolt And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release cylinder head bolts in sequence 14 to 11 with special tool 11 4 420 .

Release cylinder head bolts in sequence 10 to 1 with special tool 11 8 580 .

Fig 3: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 0 320 with bolts (1).

Tightening torque 11 12 4AZ .

Fig 4: Securing Special Tool (11 0 320) With Cylinder Head Using Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Insert 11 4 430 special tool into bore holes.

Fig 5: Inserting Special Tool (11 4 430) Into Bore Holes

Courtesy of BMW OF NORTH AMERICA, INC.

Remove coarse residues on sealing surfaces with special tool 11 4 471 from cylinder head and crankcase.

Fig 6: Removing Cylinder Head Sealing Surfaces Coarse Residues Using Special Tool (11 4 471)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove fine residues on sealing surfaces with special tool 11 4 472 from cylinder head and crankcase.

Clean all blind holes.

Replace CYLINDER HEAD GASKET .

Fig 7: Removing Cylinder Head Sealing Surfaces Fine Residues Using Special Tool (11 4 472)

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 8: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Fit new cylinder head bolts.

Insert cylinder head bolts (1 to 10) with special tool 11 8 580 .

Tightening torque 11 12 1AZ .

Insert cylinder head bolts (11 to 14) with special tool 11 4 420 .

Tightening torque 11 12 2AZ .

Insert bolts (1).

Tightening torque 11 12 3AZ .

Insert bolt (2).

Tightening torque 11 12 3AZ .

Fig 9: Identifying Timing Chain Module Bolt And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.