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Home >> BMW >> 2014 >> M6 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 94 (Camshafts, Rocker Arms, Intake/Exhaust Valves, Variable Camshaft Timing Control System (VANOS) - Repair) >> Camshafts >> 11 31 505 Adjusting timing of camshaft(s) (N55)

11 31 505 Adjusting timing of camshaft(s) (N55)

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

Special tools required: 

IMPORTANT: For the positioning of the special tool 11 4 281 on the mounting flats of the intake camshaft, a collision with the cylinder throttle return spring 1 can occur.
Rework special tool 11 4 281 on the basis of the following DESCRIPTION .

Necessary preliminary tasks: 

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

Fig 1: Identifying Position Of Intake Camshaft With Cylinder 1 At TDC
G10056763Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Identifying Position Of Exhaust Camshaft With Cylinder 1 At TDC
G10056764Courtesy of BMW OF NORTH AMERICA, INC.

Part numbers (2) on intake and exhaust camshafts (1) point upwards.

Fig 3: Identifying Part Numbers On Intake And Exhaust Camshafts
G10056765Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 4 285 with bolts (1) to cylinder head.

NOTE: Fit special tool 11 4 282 underneath on side of intake camshaft.

Mount reworked special tool 11 4 281 on the intake camshaft.

Mount special tool 11 4 281 on the exhaust camshaft.

Fig 4: Mounting Special Tools
G10056766Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Only use special tool 11 4 280 to loosen central bolts (1 and 2) of Vanos unit.

Release central bolts (1 and 2).

Fig 5: Identifying Central Bolts
G10056767Courtesy of BMW OF NORTH AMERICA, INC.

Release CHAIN TENSIONER  (1).

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.

Fig 6: Identifying Chain Tensioner
G10056768Courtesy of BMW OF NORTH AMERICA, INC.

Turn sensor gears (2) in direction of arrow until retaining pins (1) on special tool 11 4 290 match up.

11 4 290 Slide on special tool in direction of arrow.

Fig 7: Turning Sensor Gears Until Retaining Pins On Special Tool Match Up
G10056769Courtesy of BMW OF NORTH AMERICA, INC.

Use bolts to fasten special tool 11 4 290 .

Installation note: 

Replace both central bolts.

Screw in both central bolts.

Release both central bolts 90°.

Screw special tool 11 9 340 into cylinder head.

Fig 8: Fastening Special Tools
G10056770Courtesy of BMW OF NORTH AMERICA, INC.

Pretension timing chain with special tool 11 9 340 00 9 250 0, 6 Nm 

Fig 9: Pretensioning Timing Chain
G10056771Courtesy of BMW OF NORTH AMERICA, INC.

Use special tool 00 9 120 to tighten central bolts of intake camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 10: Tightening Central Bolts Of Intake Camshaft Adjuster Using Special Tool 00 9 120
G10056772Courtesy of BMW OF NORTH AMERICA, INC.

Use special tool 00 9 120 to tighten central bolts of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Tightening Central Bolts Of Exhaust Camshaft Adjuster Using Special Tool 00 9 120
G10056773Courtesy 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.

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