11 12 100 Removing and installing cylinder head (N55)

Special tools required: 

• 11 0 320
• 11 4 420
• 11 4 430
• 11 4 471
• 11 4 472
• 11 8 580

Necessary preliminary tasks: 

• Remove exhaust system. See REMOVING COMPLETE EXHAUST SYSTEM and REMOVING CATALYTIC CONVERTER .
• Drain COOLANT .
• Drain ENGINE OIL .
• Remove ENGINE .
• Mount engine on ASSEMBLY STAND .
• Remove intake PLENUM .
• Remove EXHAUST TURBOCHARGER with integrated exhaust manifold.
• Detach coolant hoses from cylinder head.
• Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Release screws (1).

Unclip timing chain module (2) at separation point (3) and remove towards top.

Set down timing chain.

Fig 1: Identifying Timing Chain Module Screws And Separation Point

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Release screws (1).

Tightening torque 11 12 3AZ .

Release screw (2).

Tightening torque 11 12 3AZ .

Fig 2: Identifying Screws

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Release cylinder head bolts in sequence 14 to 11 with special tool 11 4 420 .

Release cylinder head bolts in sequence 10 to 1 with special tool 11 8 580 .

Fig 3: Cylinder Head Bolts Tightening/Loosening Sequence (N55)

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Secure special tool 11 0 320 with bolts (1).

Tightening torque 11 12 4AZ .

Fig 4: Identifying Special Tool (11 0 320) And Bolts

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Insert 11 4 430 special tool into bore holes.

Fig 5: Inserting Special Tool Into Bore Holes

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Remove coarse residues on sealing surfaces with special tool 11 4 471 from cylinder head and crankcase.

Fig 6: Removing Coarse Residues On Sealing Surfaces

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Remove fine residues on sealing surfaces with special tool 11 4 472 from cylinder head and crankcase.

Fig 7: Removing Fine Residues On Sealing Surfaces

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Clean all blind holes.

Replace CYLINDER HEAD GASKET .

Fit new cylinder head bolts.

Insert cylinder head bolts (1 to 10) with special tool 11 8 580 .

Tightening torque 11 12 1AZ .

Insert cylinder head bolts (11 to 14) with special tool 11 4 420 .

Tightening torque 11 12 2AZ .

Fig 8: Cylinder Head Bolts Tightening/Loosening Sequence (N55)

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Insert bolts (1).

Tightening torque 11 12 3AZ .

Insert bolt (2).

Tightening torque 11 12 3AZ .

Fig 9: Identifying Screws

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Assemble engine.