11 12 100 Removing and installing/sealing cylinder head (N12)

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

IMPORTANT: Fit new cylinder head screws.

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 EXHAUST MANIFOLD .
Remove intake air MANIFOLD .
Remove OIL DIPSTICK .
Detach coolant hoses from cylinder head.
Remove CYLINDER HEAD COVER .
Remove INLET AND EXHAUST .

Secure crankshaft with special tool 11 9 590 .

Fig 1: Identifying Special Tool (11 9 590)

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NOTE: Remove and install cylinder head in installed state.

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

Fig 2: Identifying Lifting Eye Engine Crane

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NOTE: Remove and install cylinder head in installed state.
Move front panel into ASSEMBLY 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 3: Securing Special Tool (11 9 630) With Bolts

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Release screws (1).

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

Installation:

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

Fig 4: Identifying Screws

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Release screw (1).

Fig 5: Identifying Bolt

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Release cylinder head bolts with special tool 11 2 250.

Fig 6: Removing Cylinder Head Bolts Using Special Tool (11 2 250)

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

NOTE: Remove washers with a magnet.

Graphic shows camshafts removed.

Fig 7: Cylinder Head Bolts Installing 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.

IMPORTANT: Do not use any metal-cutting tools.

Fig 8: 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.

IMPORTANT: Do not use any metal-cutting tools.

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

Clean all pocket holes.

Replace CYLINDER HEAD GASKET .

Fig 9: Removing Fine Residues On Sealing Surfaces Using Special Tool (11 4 472)

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IMPORTANT: Fit new cylinder head screws.
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.

NOTE: Graphic shows camshafts removed.

Fig 10: Cylinder Head Bolts Installing Sequence

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Secure screws (1).

Tightening torque: 11 12 1AZ.

Fig 11: Identifying Screws

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Tighten bolt (1).

Tightening torque: 11 12 3AZ.

Fig 12: Identifying Bolt

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Assemble engine.