11 12 100 Removing and installing cylinder head (N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

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

See ENGINE - SPECIAL TOOLS (N54, N63) .

IMPORTANT: 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 engine
Remove inlet and exhaust adjustment units

Release screws (1).

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

Set down timing chain.

IMPORTANT: If the timing chain is stowed in the gearcase, the crankshaft must no longer be rotated.
This would cause the timing chain on the crankshaft sprocket wheel to jam or jump.

Installation:

The timing chain is lifted out with a hook only during assembly.

Fig 1: Identifying Screws, Timing Chain Module And Junction

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The lowest screw can only be released when the timing chain module is pressed forward slightly.

IMPORTANT: Secure the lowest screw with a gripper against falling down.

Release screws (1).

Tightening torque 11 12 3AZ , see CYLINDER HEAD

Fig 2: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe different bolt heads.

Release M9 cylinder head bolts (1) with special tool 11 4 420 .

Tightening torque 11 12 2AZ , see CYLINDER HEAD

Fig 3: Identifying M9 Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Release M10 cylinder head bolts (1) with special tool 11 8 580 from outside inwards.

Tightening torque 11 12 1AZ , see CYLINDER HEAD

IMPORTANT: All cylinder head bolts must be replaced.
Risk of damage!
Joining torque and angle of rotation must be observed without fail.

Fig 4: Removing M10 Cylinder Head Bolts With Special Tool 11 8 580

Courtesy of BMW OF NORTH AMERICA, INC.

Shims (1) of cylinder head bolts can only be removed with a magnet (2) between cylinder head and bearing strip.

Fig 5: Removing Cylinder Head Bolts Shims With Magnet

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 0 320 with existing cylinder head cover bolts (1).

Tightening torque 11 12 4AZ , see CYLINDER HEAD

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 set cylinder head down on sealing face, risk of damage to valves.

Fig 6: Identifying Special Tool 11 0 320 And Existing Cylinder Head Cover Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Set down cylinder head with inlet and exhaust camshafts on side only, risk of damage to valves (1).

Fig 7: Identifying Valves

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Insert special tool 11 4 430 into bores.

Fig 8: Identifying Special Tool 11 4 430

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

IMPORTANT: Do not use any metal-cutting tools.

Fig 9: Removing Coarse Residues On Sealing Faces With Special Tool 11 4 471 From Cylinder Head And Crankcase

Courtesy of BMW OF NORTH AMERICA, INC.

Remove fine residues on sealing faces 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.

Fig 10: Identifying Special Tool 11 4 472

Courtesy of BMW OF NORTH AMERICA, INC.

Risk of corrosion and cracking!

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

Clean all pocket holes.

Fig 11: Identifying Threaded Hole

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Installation:

Replace cylinder head gasket .

IMPORTANT: Observe sequence for tightening cylinder head bolts without fail.

Installation:

Fit new cylinder head screws.

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

Tightening torque 11 12 1AZ , see CYLINDER HEAD

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

Tightening torque 11 12 2AZ , see CYLINDER HEAD

Fig 12: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Graphic shows inlet and exhaust camshafts removed.

Observe sequence for tightening cylinder head bolts without fail.

IMPORTANT: The 2nd torsion angle relates only to cylinder head bolts 1 to 10.

Installation:

Tightening torque:
All cylinder head bolts 1 to 14 to 30 Nm
1st angle of rotation:
All cylinder head bolts 1 to 14 to 90°
2nd angle of rotation:
Only cylinder head bolts 1 to 10 to 90°
3rd angle of rotation:

All cylinder head bolts 1 to 14 to 45°

Installation:

Replace screws (1).

Tightening torque 11 12 3AZ , see CYLINDER HEAD

IMPORTANT: Secure the lowest screw with a gripper against falling down.

Fig 13: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.