11 31 505 Adjusting timing of camshaft(s) (N20, N26)

Special tools required:

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Check TIMING .

With 1st cylinder in TDC firing position, cams of intake camshaft point upwards at an angle.

Position tracing gauge (2) on mounting flats of intake camshaft.

Order number: 2 212 831

Fig 1: Locating Cams Of Intake Camshaft

G09923107

Courtesy of BMW OF NORTH AMERICA, INC.

With 1st cylinder in TDC firing position, cams of exhaust camshaft point upwards at an angle.

Fig 2: Locating Cams Of Exhaust Camshaft

G09923108

Courtesy of BMW OF NORTH AMERICA, INC.

The designation E and A on the intake and exhaust camshaft (1) as well as the part numbers can be read from above.

Fig 3: Identifying Designation On Camshaft

G09845251

Courtesy of BMW OF NORTH AMERICA, INC.

Secure mounting bridge (1) on cylinder head.

Secure tracing gauges (2 and 3) to mounting bridge (1).

Fig 4: Identifying Mounting Bridge And Tracing Gauges

G09923110

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The screw connection (5) is imperative for undoing and securing the central bolt.

Secure tracing gauge (2) with screw (5).

Fig 5: Identifying Tracing Gauge And Screw

G09923111

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The screw connection (7) is imperative for undoing and securing the central bolt.

Screw (6) must be removed for securing the screw (7).

Secure tracing gauge with screw (7).

Fig 6: Identifying Screw Connection

G09923112

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Only use special tool to undo central bolts (2 and 3) of VANOS units.
If it is not possible to fit special tool, mounting flats of relevant camshaft must be counter-held (risk of damage!) .

Undo central bolts (2 and 3).

Fig 7: Identifying Central Bolts

G09923113

Courtesy of BMW OF NORTH AMERICA, INC.

Remove vacuum unit (1) and lay to one side.

Fig 8: Identifying Vacuum Unit And Chain Tensioner

G09923114

Courtesy of BMW OF NORTH AMERICA, INC.

Release CHAIN TENSIONER (2).

Tightening torque 11 31 7AZ .

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Installation note:

Replace sealing ring.

Rotate camshaft sensor wheel until retaining pin (1 and 2) match up with setting gauge.

Fig 9: Positioning Retaining Pin

G09923115

Courtesy of BMW OF NORTH AMERICA, INC.

Secure camshaft sensor wheel.

Pretension timing chain with special tool 11 9 340 00 9 4600, Nm

Fig 10: Installing Timing Chain With Special Tool (11 9 340)

G09845257

Courtesy of BMW OF NORTH AMERICA, INC.

Only use special tool to secure central bolt (1) of intake adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Identifying Intake Adjuster Central Bolt

G09923117

Courtesy of BMW OF NORTH AMERICA, INC.

Only use special tool to secure central bolt (1) of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 12: Identifying Exhaust Camshaft Adjuster Central Bolt

G09923118

Courtesy of BMW OF NORTH AMERICA, INC.

Remove all special tools.

Crank engine on the central bolt twice in the direction of engine rotation and check the TIMING .

Assemble engine.