11 12 100 Removing and installing cylinder head (N52T)

Special tools required:

IMPORTANT: Aluminum-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
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 EXHAUST SYSTEM .
Drain COOLANT .
Drain off ENGINE OIL .
Remove both exhaust manifolds . See 18 40 050 REMOVING AND INSTALLING/REPLACING FRONT EXHAUST MANIFOLD (N52T) or 18 40 060 REMOVING AND INSTALLING/REPLACING REAR EXHAUST MANIFOLD (N52T)
Remove INTAKE PLENUM .
Detach coolant hoses from cylinder head.
Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .
Remove both SOLENOID VALVES .

IMPORTANT: Fit new cylinder head bolts.
Do not wash off bolt coating.
There must be no fluids or contaminants in any of the threaded holes for the cylinder head bolt connections.
Risk of cracking and corrosion!
Apply a light coat of oil to washer contact areas and threads of new cylinder head bolts.

Release screws (1).

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

Set down timing chain.

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

Fig 1: Identifying Timing Chain Module And Screws

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Installation note:

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

Release bolts (2) for eccentric shaft sensor (1).

Remove eccentric shaft sensor (1) towards front.

Fig 2: Removing Eccentric Shaft Sensor & Bolts

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IMPORTANT: Screw (1) is not magnetic and must be secured against falling down.

Release screw (1).

Remove magnet wheel (2) towards front.

Fig 3: Removing Magnet Wheel

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IMPORTANT: Magnet wheel (1) is highly magnetic and must be protected against metal chips.

After removing, place magnet wheel (1) in a plastic bag (2) with a seal.

Fig 4: Identifying Magnet Wheel And Plastic Bag

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Preload eccentric shaft (1) upwards in direction of arrow.

Remove stop screw between 1st and 2nd cylinders.

Tightening torque: 11 37 5AZ .

Fig 5: Preloading Eccentric Shaft

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NOTE: Bolt (2) can only be released when the timing chain module is pressed forward slightly.

IMPORTANT: Secure bolt (2) with a gripper against falling down.

Fig 6: Identifying Timing Chain Module Bolts

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Release screw (2).

Tightening torque: 11 12 3AZ .

Release screws (1).

Tightening torque: 11 12 4AZ .

Installation note:

Replace aluminum screws.

IMPORTANT: Observe different bolt heads.

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

Release cylinder head bolts (2) M9 with special tool 11 4 420 .

NOTE: Graphic shows intake and exhaust camshafts removed.

Fig 7: Removing Cylinder Head Bolts Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe different M9 screw lengths (1 and 3).

Release cylinder head bolts (1 and 3) M9 with special tool 11 4 420

Tightening torque: 11 12 2AZ .

Release cylinder head bolts (2) M10 with special tool 11 8 580 from outside inwards.

Fig 8: Identifying Cylinder Head Bolts

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Tightening torque: 11 12 1AZ .

IMPORTANT: All cylinder head bolts (1, 2 and 3) must be replaced.
Jointing torque and angle of rotation must be observed without fail.
Risk of damage!

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

Tightening torque: 11 12 5AZ .

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!

Fig 9: Identifying Special Tool (11 0 320)

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Insert 11 4 430 special tool into bore holes.

Fig 10: Inserting Special Tool (11 4 430) Into Bore Holes

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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 11: Identifying Special Tool (11 4 471)

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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.

Fig 12: Identifying Special Tool (11 4 472)

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

Risk of cracking and corrosion!

Clean all threaded holes.

Replace CYLINDER HEAD GASKET .

Fig 13: Identifying Threaded Holes For Cylinder Head Bolt Connections

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

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 .

Fig 14: Cylinder Head Bolts Tightening/Loosening Sequence

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Tightening torque: 11 12 2AZ .

NOTE: Graphic shows intake and exhaust camshafts removed.

Observe sequence for tightening cylinder head bolts without fail.

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

Installation note:

Jointing 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°

Insert bolts (1).

Tightening torque: 11 12 4AZ .

IMPORTANT: Secure bolt (2) with a gripper against falling down.

Insert bolt (2).

Tightening torque: 11 12 3AZ .

Installation note:

Replace aluminum screws.

Fig 15: Identifying Timing Chain Module Bolts

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Assemble engine.