11 12 100 Removing and installing cylinder head (N52)

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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 .
Joining 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 REMOVING/INSTALLING FRONT EXHAUST MANIFOLD and REMOVING/INSTALLING REAR EXHAUST MANIFOLD .
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, Separation Point 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: Identifying Eccentric Shaft Sensor And 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: Identifying Magnet Wheel And Screw

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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: Placing Magnet Wheel In 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: Turning 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.

Release bolt (2).

Tightening torque 11 12 3AZ .

Release screws (1).

Tightening torque 11 12 4AZ .

Installation note:

Replace aluminum screws .

Fig 6: Identifying Bolt And Screws

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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: Identifying Special Tools For Cylinder Head Bolts

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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.

Tightening torque 11 12 1AZ .

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

Fig 8: Identifying Cylinder Head Bolts

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

Tightening torque 11 12 5AZ .

IMPORTANT: Remove 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: Securing Special Tool With Existing Cylinder Head Cover Bolts

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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: Removing Coarse Residues On Sealing Surfaces

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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 .

Tightening torque 11 12 2AZ .

NOTE: Graphic shows intake and exhaust camshafts removed.

Fig 14: Cylinder Head Bolts Tightening/Loosening Sequence

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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:

Joining 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 Bolt And Screws

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Assemble engine.