11 31 505 Adjusting camshaft timing (N12)

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

Special tools required:

00 9 120
00 9 250
11 9 340
11 9 450
11 9 540
11 9 590
32 2 100

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.
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)

G05515476

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: Identifying Inlet Camshaft Securing Bolts And Special Tool (11 9 540)

G05515594

Courtesy of BMW OF NORTH AMERICA, INC.

Release chain tensioner (have a cleaning cloth ready).

Tightening torque 11 31 4AZ

Fig 3: Identifying Chain Tensioner

G05515625

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

G05515630

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 Camshafts Identification (IN And EX)

G05515590

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 Position

G05515591

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 Position

G05515592

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 With Special Tool (32 2 100)

G05515634

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: Identifying Special Tools (11 9 540 And 32 2 100) And Bolt

G05515635

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: Identifying Inlet Camshaft Securing Bolts And Special Tool (11 9 540)

G05515594

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: Identifying Special Tool (11 9 340)

G05515637

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: Identifying Central Bolt And Special Tool (00 9 120)

G05515638

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: Identifying Central Bolt And Special Tool (00 9 120)

G05515639

Courtesy of BMW OF NORTH AMERICA, INC.

Remove all special tools.

Assemble engine.