11 12 100 Removing and installing/sealing cylinder head (N14)

Special tools required:

11 2 250
11 4 471
11 4 472
11 9 590
11 9 630

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 COOLANT .
Drain ENGINE OIL .
Remove INTAKE AIR MANIFOLD .
Remove oil dipstick.
Detach coolant hoses from cylinder head.
Remove OIL DIPSTICK GUIDE TUBE .
Remove CYLINDER HEAD COVER .
Remove solenoid valve from VANOS ADJUSTMENT UNIT .
Remove INLET ADJUSTMENT UNIT .

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 Engine Crane And Lifting Eye

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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: Identifying Special Tool (11 9 630) With Standard 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 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 shims with a magnet.
Illustration shows camshafts removed.

Fig 6: Identifying Cylinder Head Bolts Tightening Sequence

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

IMPORTANT: Do not use any metal-cutting tools.

Fig 7: Identifying 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 8: Identifying Special Tool (11 4 472)

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IMPORTANT: Fit new cylinder head screws.
Do not wash off bolt coating.

Attach shims to cylinder head bolts.

Shims can drop into the engine (risk of damage!).

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

Tightening torque 11 12 2AZ .

Fig 9: Identifying Cylinder Head Bolts Tightening Sequence

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Secure bolts (1).

Tightening torque 11 12 1AZ .

Fig 10: Identifying Bolts

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Tighten the screw (1).

Tightening torque 11 12 3AZ .

Fig 11: Identifying Screw

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Assemble engine.