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11 12 100 Removing and installing cylinder head (N55)

Special tools required: 

IMPORTANT: Fit new cylinder head bolts.
Do not wash off bolt coating.
Lightly  oil washer on the contact surfaces (both sides).
There must be no coolant, water or engine oil in the blind holes.
Risk of cracking and corrosion! 

Necessary preliminary tasks 

IMPORTANT: If the timing chain is stowed in the gear case, the crankshaft must no longer be rotated.

Release screws (1).

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

Set down timing chain.

NOTE: Graphic shows N52.
Fig 1: Identifying Timing Chain Module And Separation Point And Screws
G09844312Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Bolt (2) can only be released when the timing chain module is pressed forward slightly.

Release screws (1).

Tightening torque: 11 12 3AZ .

Release screw (2).

Tightening torque: 11 12 3AZ .

Fig 2: Identifying Timing Chain Module Bolt And Screw
G09844313Courtesy of BMW OF NORTH AMERICA, INC.
Fig 3: Cylinder Head Bolts Tightening/Loosening Sequence (N55)
G09844314Courtesy 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 .

NOTE: Picture shows intermediate lever and exhaust camshaft removed.

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

Tightening torque: 11 12 4AZ .

IMPORTANT: Removing and install cylinder head with a second person helping.
Weight of cylinder head with add-on parts is approx. 40 kg.
Do not rest cylinder head on sealing surface. Risk of damage to valves! 
NOTE: Graphic shows N52.
Fig 4: Removing/Installing Cylinder Head
G09844315Courtesy of BMW OF NORTH AMERICA, INC.

Insert 11 4 430 special tool into bore holes.

Fig 5: Inserting (11 4 430) Special Tool Into Bore Holes
G09844316Courtesy of BMW OF NORTH AMERICA, INC.

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

IMPORTANT: Do not use any metal-cutting tools.
Fig 6: Removing Coarse Residue Using Special Tool From Cylinder Head And Crankcase
G09844317Courtesy of BMW OF NORTH AMERICA, INC.

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

IMPORTANT: Do not use any metal-cutting tools.
There must be no coolant, water or engine oil in the pocket holes.
Risk of cracking and corrosion! 

Clean all blind holes.

Replace CYLINDER HEAD GASKET .

Fig 7: Removing Fine Residue Using Special Tool From Cylinder Head And Crankcase
G09844318Courtesy of BMW OF NORTH AMERICA, INC.
Fig 8: Cylinder Head Bolts Tightening/Loosening Sequence (N55)
G09844319Courtesy 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 .

NOTE: Picture shows intermediate lever and exhaust camshaft removed.

Insert bolts (1).

Tightening torque: 11 12 3AZ .

Insert bolt (2).

Tightening torque: 11 12 3AZ .

Fig 9: Identifying Intermediate Lever And Exhaust Camshaft Bolts
G09844320Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

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