11 12 100 Removing and Installing Cylinder Head (N54)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 BMW 335xi, 2010 BMW 335i, 2009 BMW 335xi, 2009 BMW 335i, and 2008 BMW 335xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

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

IMPORTANT:

Aluminum screws/bolts must be replaced each time they are released .

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Fit new cylinder head screws.

Do not wash off bolt coating.

There must be no coolant, water or engine oil in the pocket holes.

Risk of corrosion and cracking!

Necessary preliminary tasks:

Remove engine. (See 11 00 050 REMOVING AND INSTALLING ENGINE (N54) )
Remove inlet and exhaust adjustment unit (See 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N54) )

Release screws (1).

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

Set down timing chain.

IMPORTANT:

If the timing chain is stowed in the gear case, the crankshaft must no longer be rotated.

This would cause the timing chain on the crankshaft sprocket wheel to jam or jump.

Installation:

The timing chain is lifted out with a hook only during assembly.

Fig 1: Identifying Timing Chain, Junction & Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque, see 11 12 3AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

NOTE: Screw (2) can only be released when the timing chain module is pressed forward slightly.

IMPORTANT: Secure bolt (2) with a gripper against falling down.

Release bolt (2).

Fig 2: Identifying Timing Chain Module Screw

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe different bolt heads.

Release M9 cylinder head bolts (1) with special tool 11 4 420. (See 11 4 420 TORX SOCKET T50 )

Tightening torque, see 11 12 2AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Fig 3: Identifying Special Tool (11 4 420)

Courtesy of BMW OF NORTH AMERICA, INC.

Release M10 cylinder head bolts (1) with special tool 11 8 580 from outside inwards. (See 11 8 580 WRENCH SOCKET TORX T60 )

Tightening torque, see 11 12 1AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

IMPORTANT:

All cylinder head bolts must be replaced.

Jointing torque and angle of rotation must be observed without fail.

Risk of damage!

Fig 4: Identifying Special Tool (11 8 580)

Courtesy of BMW OF NORTH AMERICA, INC.

Shims (1) of cylinder head bolts can only be removed with a magnet (2) between cylinder head and bearing strip.

Fig 5: Identifying Shim & Magnet

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Secure special tool 11 0 320 with existing cylinder head cover bolts (1). (See 11 0 320 REMOVAL AND INSTALLATION BRACKET )

Tightening torque, see 11 12 4AZ in TORQUE SPECIFICATIONS -- TWIN TURBO

IMPORTANT:

Removing and install cylinder head with a second person helping.

Weight of cylinder head with add-on parts is approx. 40 kg.

Do not set cylinder head down on sealing face, risk of damage to valves.

Fig 6: Identifying Special Tool (11 0 320)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Set down cylinder head with inlet and exhaust camshafts on side only, risk of damage to valves (1).

Fig 7: Identifying Cylinder Head With Inlet & Exhaust Camshafts Valve

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Insert special tool 11 4 430 into bores. (See 11 4 430 SEAL PLUGS (2 X) )

Fig 8: Identifying Special Tool (11 4 430)

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

IMPORTANT: Do not use any metal-cutting tools.

Fig 9: Identifying Special Tool (11 4 471)

Courtesy of BMW OF NORTH AMERICA, INC.

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

IMPORTANT:

Do not use any metal-cutting tools.

There must be no coolant, water or engine oil in the pocket holes.

Risk of corrosion and cracking!

Clean all pocket holes.

Replace cylinder head gasket.

Fig 10: Identifying Special Tool (11 4 472)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe sequence for tightening cylinder head bolts without fail.

Fit new cylinder head screws.

Insert cylinder head bolts (1 to 10) with special tool 11 8 580. (See 11 8 580 WRENCH SOCKET TORX T60 )

Tightening torque, see 11 12 1AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Insert cylinder head bolts (11 to 14) with special tool 11 4 420. (See 11 4 420 TORX SOCKET T50 )

Tightening torque, see 11 12 2AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

NOTE: Picture shows inlet and exhaust camshafts removed.

Fig 11: Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Observe sequence for tightening cylinder head bolts without fail.

IMPORTANT: The 2nd torsion angle relates only to cylinder head bolts 1 to 10.

Installation:

Jointing torque:
All cylinder head bolts 1 to 14 to 30 Nm
1st angle of rotation:
All cylinder head bolts 1 to 14 to 90°
2nd angle of rotation:
Only cylinder head bolts 1 to 10 to 90°
3rd angle of rotation:
All cylinder head bolts 1 to 14 to 45°

Replace screws (1).

Tightening torque, see 11 12 3AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

IMPORTANT: Secure bolt (1) with a gripper against falling down.

Fig 12: Identifying Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.