11 31 505 Adjusting camshaft timing (N12)

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

IMPORTANT: Modified procedure for timing adjustment.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjustment units.
Observe direction of engine rotation (direction of rotation always clockwise when viewed towards timing drive side).
To open the central bolt at the camshaft, grip hexagon on rear of camshaft.
Risk of damage!

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Check TIMING .

IMPORTANT: Danger of mixing up special tool bore.
Balance hole and special tool bore can be mixed up; all pistons must be in the 90° position.
If necessary, determine by means of spark plug bore.

Rotate crankshaft at central bolt.

Slide in special tool 11 9 590 in direction of arrow and block crankshaft.

Fig 1: Identifying Special Tool (11 9 590)

G04796154

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of damage!
To open central bolt, mount special tool 11 9 540 on camshaft.
If the setting gauges cannot be positioned, grip the camshaft with an open-end wrench to release the central bolt.

Fig 2: Mounting Special Tool (11 9 540) On Camshaft

G04796272

Courtesy of BMW OF NORTH AMERICA, INC.

Release special tool 11 9 340.

Fig 3: Identifying Special Tool (11 9 340) Into Cylinder Head

G04796315

Courtesy of BMW OF NORTH AMERICA, INC.

To open central bolts (1 and 2), mount special tool 11 9 540 on camshafts.

Release central bolts (1 and 2).

Tightening torque: 11 36 1AZ .

Fig 4: Identifying Central Bolts

G04796308

Courtesy of BMW OF NORTH AMERICA, INC.

The designations for the inlet camshaft (IN) and exhaust camshaft (EX) point upwards.

Both camshafts (inlet and exhaust) have three machined surfaces to enable special tool 11 9 450 to be mounted.

The fourth surface is not machined and is crescent-shaped - it must point downwards.

Fig 5: Identifying Designations For Inlet Camshaft (IN) And Exhaust Camshaft (EX)

G04796268

Courtesy of BMW OF NORTH AMERICA, INC.

Position of exhaust camshaft (EX) points at an angle to the right in an upper outward direction.

Fig 6: Identifying Exhaust Camshaft

G04796269

Courtesy of BMW OF NORTH AMERICA, INC.

Position of inlet camshaft (E) points at an angle to the left in an upper outward direction.

Fig 7: Identifying Inlet Camshaft

G04796270

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate exhaust camshaft with special tool 32 2 100 in direction of arrow.

Fig 8: Rotating Exhaust Camshaft Using Special Tool (32 2 100)

G04796312

Courtesy of BMW OF NORTH AMERICA, INC.

Pretension camshaft with special tool 32 2 100 .

Attach special tool 11 9 540 (exhaust side) to dihedron and secure with bolt (1).

Fig 9: Attaching Special Tool (11 9 540) To Dihedron

G04796313

Courtesy of BMW OF NORTH AMERICA, INC.

Attach special tool 11 9 540 (inlet side) to dihedron and secure with bolts (1 and 2).

Fig 10: Attaching Special Tool (11 9 540) To Dihedron

G04796272

Courtesy of BMW OF NORTH AMERICA, INC.

Screw special tool 11 9 340 into cylinder head.

Pretension timing chain with special tool 00 9 250 to 0.6 Nm.

Fig 11: Installing Special Tool (11 9 340) Into Cylinder Head

G04796315

Courtesy of BMW OF NORTH AMERICA, INC.

Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.

Tightening torque: 11 36 1AZ .

Fig 12: Securing Central Bolt With Special Tool (00 9 120)

G04796316

Courtesy of BMW OF NORTH AMERICA, INC.

Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.

Tightening torque: 11 36 1AZ .

Fig 13: Securing Central Bolt Using Special Tool (00 9 120)

G04796317

Courtesy of BMW OF NORTH AMERICA, INC.

Remove all special tools.

Assemble engine.