11 12 100 Removing and installing cylinder head (N52K)

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

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 .
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 1840060 REMOVING AND INSTALLING/REPLACING REAR EXHAUST MANIFOLD (N52K) or 1840050 REMOVING AND INSTALLING/REPLACING FRONT EXHAUST MANIFOLD (N52K)
Remove INTAKE PLENUM
Detach coolant hoses from cylinder head
Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS

IMPORTANT: Fit new cylinder head screws.
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 corrosion and cracking!
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 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: Identifying Timing Chain Module With Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove eccentric shaft sensor (1) towards front.

Fig 2: Removing Eccentric Shaft Sensor Mounting Bolts

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: Removing Magnet Wheel And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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 In Plastic Bag

Courtesy of BMW OF NORTH AMERICA, INC.

Pre-tension eccentric shaft (1) upwards in direction of arrow.

Remove stop screw between 1st and 2nd cylinders.

Tightening torque 11 37 5AZ .

Fig 5: Identifying Pre-Tension Eccentric Shaft With Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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 .

Release screws (1).

Tightening torque 11 12 4AZ .

Installation:

Replace aluminum screws.

Fig 6: Identifying Timing Chain Module Bolt And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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: Picture shows intake and exhaust camshafts removed.

Fig 7: Identifying Cylinder Head Bolts And Special Tool (11 8 580)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT:

Observe different M9 bolt lengths (1 and 3).

Undo cylinder head bolts (1 and 3) M9 using 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

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Insert 11 4 430 special tool into bores.

Fig 10: Identifying Special Tool (11 4 430)

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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 Using Special Tool 11 4 471

Courtesy of BMW OF NORTH AMERICA, INC.

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: Removing Fine Residues On Sealing Surfaces Using Special Tool 11 4 472

Courtesy of BMW OF NORTH AMERICA, INC.

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

Risk of corrosion and cracking!

Clean all threaded holes.

Replace CYLINDER HEAD GASKET .

Fig 13: Identifying Cylinder Head Bolt And Threaded Holes

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 .
Tightening torque 11 12 1AZ .
Insert cylinder head bolts (11 to 14) with special tool 11 4 420 .
Tightening torque 11 12 2AZ .

NOTE: Picture shows intake and exhaust camshafts removed.

Fig 14: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

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 .

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

Insert bolt (2).

Tightening torque 11 12 3AZ .

Installation:

Replace aluminum screws.

Fig 15: Identifying Timing Chain Module And Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.