1112100 Removing and installing/sealing cylinder head (N51)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

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 ENGINE OIL .
Remove both exhaust manifolds See 1840060 REMOVING AND INSTALLING/REPLACING REAR EXHAUST MANIFOLD (N51) or 1840050 REMOVING AND INSTALLING/REPLACING FRONT EXHAUST MANIFOLD (N51) .
Remove intake PLENUM .
Detach coolant hoses from cylinder head.
Remove CYLINDER HEAD COVER .
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).

Release screws (1).

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

Do not allow timing chain to drop down.

Installation:

Only during assembly is the timing chain lifted out with a hook.

Fig 1: Identifying Timing Chain Module With Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten screws (2).

Remove eccentric shaft sensor (1) towards front.

Fig 2: Removing Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Remove magnet wheel (2) towards front.

IMPORTANT: Magnet wheel (2) is extremely magnetic.

Fig 3: Removing Magnet Wheel

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: After removing, pack magnet wheel (1) away immediately in a plastic bag (2) for safety reasons.
Magnet wheel must be protected against metal chips.

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 min stop screw between 1st and 2nd cylinders.

Tightening torque: 11 37 6AZ .

Fig 5: Turning Eccentric Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: 11 12 3AZ .

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

IMPORTANT: Secure screw (2) with a gripper against falling out and remove.

Installation:

Replace aluminum screws.

Fig 6: Identifying Screws On Chain Module

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Different screw heads

M 10 screw (1) is released with special tool 11 8 580 SOCKET WRENCH .

M 9 screw (2) is released with special tool 11 4 420 .

NOTE: Graphic shows camshaft removed.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1 and 3) with special tool 11 4 420 .

Tightening torque: 11 12 2AZ

Release screws (2) with special tool 11 8 580 SOCKET WRENCH from outside inwards.

Tightening torque: 11 12 1AZ

IMPORTANT: All screws must be replaced.
Jointing torque and angle of rotation must be observed without fail (risk of damage).

Fig 8: Identifying Cylinder Head Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque: 11 12 4AZ .

IMPORTANT: Weight of cylinder head with add-on parts is approx. 40 kg.
Remove and install cylinder head with two persons.
Do not set cylinder head down on sealing surface, risk of damage to engine valves.

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