11 12 100 Removing and installing cylinder head (N52)

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2008 BMW Z4, 2007 BMW Z4, 2007 BMW 530xi, 2007 BMW 530i, and 2007 BMW 525xi. 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

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.

The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.

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
Remove Intake Air Manifold
Detach coolant hoses from cylinder head
Remove Inlet And Exhaust Adjustment Unit

IMPORTANT: Fit new cylinder head screws.

Do not wash off bolt coating.

There must be no coolant, water or engine oil in the pocket holes.

Risk of corrosion and cracking!

Release screws (1).

Unclip timing chain module (2) at junction (3) 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.

Fig 1: Identifying Engine Timing Chain Module, Junction And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Release screws (2).

Remove eccentric shaft sensor (1) towards front.

Fig 2: Identifying Eccentric Shaft Sensor And Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release screw (1).

Remove magnet wheel (2) towards front.

Fig 3: Identifying Magnet Wheel And Screw

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

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

Remove stop screw between 1st and 2nd cylinders.

For tightening torque refer to 11 37 6AZ in 11 37 VARIABLE VALVE GEAR (N52) .

Fig 5: Identifying Eccentric Shaft Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Release bolt (2).

For tightening torque refer to 11 12 3AZ .

Release screws (1).

For tightening torque refer to 11 12 4AZ .

Installation:

Replace aluminium screws.

Fig 6: Identifying Engine Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe different bolt heads.

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

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

NOTE: Picture shows inlet and exhaust camshafts removed.

Fig 7: Identifying Special Tool (11 4 420) And (11 8 580)

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

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

For tightening torque refer to 11 12 2AZ in 11 12 CYLINDER HEAD WITH COVER .

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

For tightening torque refer to 11 12 1AZ in 11 12 CYLINDER HEAD WITH COVER .

Fig 8: Identifying Engine Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

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).

For tightening torque refer to 11 12 5AZ in 11 12 CYLINDER HEAD WITH COVER .

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 9: Identifying Special Tool (11 0 320) And Cylinder Head Cover Bolts

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Insert special tool 11 4 430 into bores.

Fig 10: 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 11: Identifying Special Tool (11 4 471)

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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.

Risk of corrosion and cracking!

Clean all pocket holes.

Replace Cylinder Head Gasket.

Fig 12: Identifying Special Tool (11 4 472)

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fit new cylinder head screws.

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

For tightening torque refer to 11 12 1AZ in 11 12 CYLINDER HEAD WITH COVER .

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

For tightening torque refer to 11 12 2AZ in 11 12 CYLINDER HEAD WITH COVER .

Fig 13: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Picture 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:

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).

For tightening torque refer to 11 12 3AZ in 11 12 CYLINDER HEAD WITH COVER .

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

Insert bolt (2).

For tightening torque refer to 11 12 3AZ in 11 12 CYLINDER HEAD WITH COVER .

Installation:

Replace aluminium screws.

Fig 14: Identifying Engine Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.