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: Suspending Engine With Engine Crane From 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 .

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

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

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 Crankshaft Gear 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 Crankshaft Gear Screws

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Tighten bolt (1).

Tightening torque: 11 12 3AZ .

Fig 10: Identifying Bolt

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Assemble engine.