11 12 100 Removing and installing/sealing cylinder head (N18)

Special tools required:

IMPORTANT: Fit new cylinder head bolts.
Do not wash off bolt coating.
There must not be any coolant, water or oil present in the pocket holes (risk of corrosion and cracking ).

Necessary preliminary tasks:

Remove EXHAUST SYSTEM .
Drain COOLANT .
Drain ENGINE OIL .
Remove intake PLENUM .
Detach all coolant hoses from engine.
Remove oil dipstick GUIDE TUBE .
Remove CYLINDER HEAD COVER .
Remove BOTH SOLENOID VALVES .
Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTER .

NOTE: Remove and install cylinder head in installed state.

Suspend engine with engine crane (1) from lifting eye (2).

Fig 1: Identifying Engine Crane And Lifting Eye

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NOTE: Remove and install cylinder head in installed state.
Move front panel into WORKING POSITION .

Release upper ALTERNATOR SCREWS , do not remove alternator.

Remove right ENGINE MOUNT .

Secure special tool 11 9 630 with standard bolts (1 and 2).

Fig 2: Securing Special Tool (11 9 630) With Standard Bolts

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Release screws (1).

IMPORTANT: If the timing chain is stowed in the gear case, the crankshaft must no longer be rotated.
The timing chain may jam on the crankshaft gear.

Fig 3: Identifying Screws

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Installation note:

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

Release screw (1).

Fig 4: Identifying Screw

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Release cylinder head bolts with special tool 11 2 250 .

Release cylinder head bolts from outside inwards (10 to 1).

NOTE: Remove washers with a magnet.
Illustration shows camshafts removed.

Fig 5: Cylinder Head Bolts Tightening Sequence

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Use special tool 11 4 471 to remove coarse gasket remnants from sealing surfaces on cylinder head and on crankcase.

Fig 6: Removing Coarse Residues On Sealing Surfaces Using Special Tool (11 4 471)

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Remove fine gasket remnants with special tool 11 4 472 .

There must not be any coolant, water or oil present in the pocket holes (risk of corrosion and cracking ).

Clean all blind holes with suitable tools.

Replace CYLINDER HEAD GASKET .

Fig 7: Removing Fine Residues On Sealing Surfaces Using Special Tool (11 4 472)

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IMPORTANT: Fit new cylinder head bolts.
Do not wash off bolt coating.
Attach washers to cylinder head bolts.
Washers can drop into the engine (risk of damage! ).

Secure cylinder head bolts from inside outwards (1 to 10).

Tightening torque: 11 12 2AZ .

Fig 8: Cylinder Head Bolts Tightening Sequence

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Secure screws (1).

Tightening torque: 11 12 1AZ .

Fig 9: Identifying Screws

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Tighten bolt (1).

Tightening torque: 11 12 3AZ .

Fig 10: Identifying Screw

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Assemble engine.