11 36 046 Removing and installing/replacing inlet and exhaust adjustment units (N54)
Special tools required
- 11 0 300
- 11 4 280
- 11 4 281
- 11 4 283
See ENGINE - SPECIAL TOOLS (N54, N63) .
| IMPORTANT | To open central bolts, release at inlet and exhaust adjustment units with special tool 11 4 280 only. |
Necessary preliminary tasks
- Remove «cylinder head cover»(ref-351443-S18466352952009122100000) .
Remove fastener (1) in direction of arrow.
Slide in special tool 11 0 300 in direction of arrow.
Rotate flywheel (1) at central bolt until firing TDC position at cylinder no. 1 is reached.
| IMPORTANT | The TDC bore can be mixed up in automatic transmissions. |
With cylinder no. 1 in firing TDC position, inlet camshaft (1) at cylinder no. 6 points downwards at an angle to the left.
With cylinder no. 1 in firing TDC position, exhaust camshaft (2) at cylinder no. 6 points downwards at an angle to the right.
Installation
If the timing is checked while the engine is installed, this is only possible with a mirror.
Fit special tool 11 4 283 with screws (1).
Fit special tool 11 4 281 on special tool 11 4 283 .
Release central bolt of exhaust adjustment unit (1).
Release central bolt of inlet adjustment unit (2).
Tightening torque 11 36 1AZ , see 11 36 VARIABLE CAMSHAFT CONTROL
Release chain tensioner
Detach exhaust adjustment unit (1) from exhaust camshaft.
Detach inlet adjustment unit (2) from inlet camshaft.
Installation
To facilitate removal and installation of the inlet and exhaust adjustment units, turn the sensor gears at the opening downwards.
Scheme 406
| IMPORTANT | Risk of mixing up the inlet and exhaust adjustment units . Mixing up the inlet and exhaust adjustment units will cause damage to the engine. |
The inlet and exhaust adjustment units are different.
VANOS is marked with AUS and EX for the exhaust camshaft.
VANOS is marked with EIN and IN for the inlet camshaft.
Sensor gears can be fitted alternatively.
Scheme 407
Position inlet and exhaust adjustment units on camshafts.
Installation position of inlet and exhaust adjustment units can be freely selected.
Installation
Replace screws (1 and 2).
Insert screws (1 and 2).
Adjust valve timing .
Fit chain tensioner .
| IMPORTANT | Incorrect installation possible. |
Make sure that timing chain is guided in tensioning rail (1).
Note. Schematic representation on removed chain drive.
Scheme 408
Remove all special tools.
Assemble engine.
Calibration for vacuum pressure measurement
Seal stop cock (2) in direction of arrow.
Release lock nut on controller (1).
Carry out pressure adjustment in accordance with BMW diagnosis instruction.
Secure controller (1) hand-tight against turning.
Open stop cock (2) again.
Scheme 409
Release lock nut on controller (1).
Press setting with measurement.
- Determine ambient pressure
- Seal stop cock (2) in direction of arrow
- Set controller (1) to 200 ± 10 mbar below ambient pressure (e.g. 980 - 200 = 780 mbar).
Open stop cock (2) again.
Wastegate valve closes.
Initial position (1) of wastegate linkage with preset vacuum pressure.
Wastegate valve virtually closed.
Scheme 410
Checking turnability at wastegate valve.
- Wastegate valve can be turned with minimal force. Adjustment at wastegate valve is OK.
- Wastegate valve has play and can be turned without resistance, wastegate valve open too far. Carry out adjustment at wastegate valve, shorten linkage.
- Wastegate valve cannot be turned, wastegate valve closed.
Carry out adjustment at wastegate valve, lengthen linkage.
Scheme 411
Adjustment at linkage
To lengthen linkage, turn turnbuckle (1) max. 180° in counterclockwise direction.
To shorten linkage, turn turnbuckle (1) max. 180° in clockwise direction.
Engage turnbuckle (1) on adjusting lever in direction of arrow.
| IMPORTANT | Check ease of movement between turnbuckle (1) and pin of adjusting lever (ensure rectangularity). |
Check turnability at wastegate valve again.
Scheme 412
Secure lock nut (1); to do so, secure turnbuckle against turning with a suitable tool.
Tightening torque 11 65 10AZ , see SUPERCHARGER
Mount locking clip (2).
Assemble engine.
Observe diagnosis instructions.
Execute test module for boost pressure control.