11 12 100 Removing And Installing Cylinder Head (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS .

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 .
Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic . Jointing torque and angle of rotation must be observed without fail (risk of damage) .

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 gearcase, 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 Module At Junction

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The lowest screw can only be released when the timing chain module is pressed forward slightly.

IMPORTANT: Secure the lowest screw with a gripper against falling down.

Release screws (1).

Tightening torque. See 11 12 3AZ in CYLINDER HEAD WITH COVER .

Fig 2: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe different bolt heads.

Release M9 cylinder head bolts (1) with special tool 11 4 420.

Tightening torque. See 11 12 2AZ in CYLINDER HEAD WITH COVER .

Fig 3: Identifying M9 Cylinder Head Bolts With 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.

Tightening torque. See 11 12 1AZ in CYLINDER HEAD WITH COVER .

IMPORTANT: All cylinder head bolts must be replaced.
Risk of damage!
Joining torque and angle of rotation must be observed without fail.

Fig 4: Identifying M10 Cylinder Head Bolts With 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 Shims And Magnet

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 0 320 with existing cylinder head cover bolts (1).

Tightening torque. See 11 12 4AZ in CYLINDER HEAD WITH COVER .

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 Cylinder Head Cover Bolts With Special Tool 11 0 320