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

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

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. See EXHAUST SYSTEM, COMPLETE .
Drain coolant. See DRAINING AND ADDING 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 ADJUSTMENT UNIT .

Secure crankshaft with special tool 11 9 590.

Fig 1: Identifying Special Tools (11 9 590)

Courtesy of BMW OF NORTH AMERICA, INC.

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. See ENGINE AND GEARBOX MOUNTS .

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

Fig 3: Identifying Special Tool (11 9 630) With Standard Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Fig 5: Identifying Screw

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Release cylinder head bolts with special tool 11 2 250.

Fig 6: Identifying Special Tool (11 2 250)

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

NOTE: Remove shims with a magnet.

Illustration shows camshafts removed.

Fig 7: Removal Sequence Of Cylinder Head Bolts

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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 8: Identifying Special Tool (11 4 471)

Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Special Tool (11 4 472)

Courtesy of BMW OF NORTH AMERICA, INC.

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

NOTE: Illustration shows camshafts removed.

Fig 10: Removal Sequence Of Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Secure bolts (1).

Tightening torque 11 12 1AZ

Fig 11: Identifying Bolts

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Tighten the screw (1).

Tightening torque 11 12 3AZ

Fig 12: Identifying Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.