11 12 100 Removing and installing cylinder head (N52K)

WARNING: This page is about a different variant/trim than selected.

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 aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
The end faces of aluminum 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, see EXHAUST SYSTEM COMPLETE .
Drain coolant, see 17 00 005 DRAINING AND ADDING COOLANT IN RADIATOR (N52K) (X5) or 17 00 005 DRAINING AND ADDING COOLANT (N52K) (X3) .
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.

Installation:

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

Fig 1: Timing Chain Module, Junction And Screws

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

Remove eccentric shaft sensor (1) towards front.

Fig 2: Removing Eccentric Shaft Sensor

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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 filings/borings.

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

Fig 4: 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.

Tightening torque: 11 37 5AZ, see 11 37 VARIABLE VALVE GEAR .

Fig 5: 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 screw (2).

Tightening torque: 11 12 3AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

Release screws (1).

Tightening torque: 11 12 4AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

Installation:

Replace aluminum screws.

Fig 6: Bolt

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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: Special Tools (11 8 580) And (11 4 420)

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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 .

Tightening torque: 11 12 2AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

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

Tightening torque: 11 12 1AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

Fig 8: Cylinder Head Bolts

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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, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD 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 rest cylinder head on sealing surface. Risk of damage to valves!

Fig 9: Special Tool (11 0 320)

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Insert special tool 11 4 430 into bores.

Fig 10: 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: 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: Special Tool (11 4 472)

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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 .

Tightening torque: 11 12 1AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

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

Tightening torque: 11 12 2AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

NOTE: Picture shows inlet and exhaust camshafts removed.

Fig 13: Cylinder Head Bolts Tightening/Loosening Sequence

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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).

Tightening torque: 11 12 4AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

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

Insert bolt (2).

Tightening torque: 11 12 3AZ, see 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER .

Installation:

Replace aluminum screws.

Fig 14: Bolt

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Assemble engine.