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Home >> BMW >> 2011 >> 335i 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Repair - E90 (N55) >> Camshaft >> 11 31 505 Adjusting timing of camshaft(s) (N55)

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

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 TDC Firing Position/Intake Camshaft
G09836210Courtesy 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 1st Cylinder In TDC Firing Position/Exhaust Camshaft
G09836211Courtesy 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
G09836212Courtesy 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: Fitting Special Tool 11 4 282 Underneath On Side Of Intake Camshaft
G09836213Courtesy 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: Loosening Central Bolts
G09836214Courtesy 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.
Fig 6: Identifying Chain Tensioner Bolt
G09836215Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Replace sealing ring.

Turn increment wheel (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 Increment Wheel
G09836216Courtesy 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°.

11 9 340 Screw special tool into cylinder head.

Fig 8: Installing 11 9 340 Screw Special Tool Into Cylinder Head
G09836217Courtesy of BMW OF NORTH AMERICA, INC.

Pretension timing chain with special tool 11 9 34000 9 2500, 6 Nm 

Fig 9: Attaching Pretension Timing Chain Using Special Tool 11 9 340 And 00 9 250
G09836218Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque 11 36 1AZ .

Fig 10: Tightening Central Bolts Of Intake Adjuster
G09836219Courtesy 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
G09836220Courtesy 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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