Removing and installing cylinder head (B48 and B46 engine) (Cooper S and John Cooper Works)

Special tools required:

11 8 580
11 4 471
11 4 472
2 364 711
00 9 120

IMPORTANT: When replacing the cylinder head:
In all vehicles, the Digital Motor Electronics (DME) must possibly be reprogrammed/recoded after the replacement of the cylinder head.
Read out I level of the vehicle and proceed accordingly.
It is mandatory to observe PuMA measure 62634754.
For further information, see the appropriate BMW parts catalogue.

IMPORTANT: When replacing the cylinder head, there may be damage to the valve train due to a lack of motor oil.
Ensure that you follow the REPAIR NOTES FOR CYLINDER HEAD OR ENGINE REPLACEMENT .

IMPORTANT: There must be no coolant, water or motor oil in any of the threaded holes in the engine block.
Fit new cylinder head bolts.
Do not wash off screw coating.
Joining torque and angle of rotation must be observed without fail (risk of damage! ).

NOTE: When replacing cylinder head:
The complete valve timing and the Valvetronic servomotor are already pre-assembled.

Preliminary work needed:

Removal:

Unlock coolant line (1) and detach.

Unclip the coolant line (1) from the holder.

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Release bearing journal (1).

Remove guide rail (2).

Remove screw (3).

Remove holder (4).

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Unscrew the screws (1).

Remove guide rail (2).

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Fix intake camshaft with an open-end wrench (1).

Release screw (2).

Remove the camshaft sensor wheel (3).

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Disassemble the roller tappet (1) from the high pressure pump bracket (3).

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Unscrew the screws (1).

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Use special tool 11 8 580 to slacken the cylinder head bolts.

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Release the cylinder head bolts in the sequence 10 to 1.

Remove cylinder head.

Remove the cylinder head gasket.

Fig 1: Cylinder Head Bolts Loosening Sequence

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Installation:

NOTE: The oil ducts must be sealed before cleaning 11 4 471 11 4 472.

Close oil duct at front using special tool (B) from tool set 2 364 711.

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IMPORTANT: Do not use any metal-cutting tools (e.g. emery cloth) for cleaning the sealing surface!

Remove coarse residues on sealing surfaces with special tool 11 4 471 from cylinder head and crankcase.

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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 (e.g. emery cloth).
There must be no coolant, water or motor oil in the pocket holes.
Risk of cracking and corrosion!

Clean all blind holes.

Replace CYLINDER HEAD GASKET .

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Check lining sleeves (1) for damage and correct installation position.

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IMPORTANT: There must be no coolant, water and motor oil in any of the threaded holes in the engine block.
Fit new cylinder head bolts.
Do not wash off screw coating.

Lightly oil screw head support.

Joining torque and angle of rotation must be observed without fail (risk of damage! ).

Fit the cylinder head and secure with new bolts, tightening in the sequence 1 to 10.

Tightening torque: 11 12 1AZ .

Fig 2: Cylinder Head Bolts Tightening Sequence

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Secure cylinder head bolts (1) with special tool 00 9 120 and 11 8 580.

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Install and tighten down screws (1).

Tightening torque: 11 12 2AZ .

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Mount the roller tappet (1) on the high pressure pump bracket (3).

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Fix intake camshaft with an open-end wrench (1).

Position the camshaft sensor wheel (3).

Tighten down screw (2).

Tightening torque 11 31 7AZ .

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Parts : Replace bearing journals (1).

Position holder (4) on cylinder head.

Tighten screw (3).

Install guide rail (2).

Tighten bearing journal (1).

Tightening torque 11 31 3AZ .

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Install guide rail (2).

Tighten the screws.

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Connect coolant line (1) and clip in.

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Required reworking:

Install RIGHT ENGINE MOUNT .
Install INTAKE AND EXHAUST CAMSHAFT ADJUSTER .
Install EXHAUST TURBOCHARGER .
Install INTAKE PLENUM .
Install FAN COWL .
Add COOLANT .
Check engine for leak tightness

When replacing the cylinder head, the I level must possibly be coded and programmed.

Connect diagnosis system and follow the diagnosis instructions.
Service functions
Drive
Engine electronics
Reset VANOS adaptation values
Code and program I level if necessary