11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N12)
Special tools required
- 00 9 120
- 11 9 340
- 11 9 540
- 11 9 590
| IMPORTANT | Always release both central bolts to adjust the timing. The timing is not determined at firing TDC of cylinder no. 1. Modified procedure for timing adjustment. All pistons are in the 90° position. Check locking of adjustment units. |
Necessary preliminary tasks
- Remove cylinder head cover.
- Check timing.
Rotate crankshaft at central bolt.
Slide in special tool 11 9 590 in direction of arrow and block crankshaft.
Release screws (1).
Remove slide rail (2).
Scheme 468
| 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. |
Release chain tensioner (1) (have a cleaning cloth ready).
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Release bearing pin (1) on guide rail.
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Installation
Replace sealing ring.
Scheme 469
Release central bolts of inlet adjustment unit (1) and exhaust adjustment unit (2).
Detach inlet adjustment unit from inlet camshaft.
Detach exhaust adjustment unit from exhaust camshaft.
| IMPORTANT | Danger of mixing up adjustment units . Mixing up the adjustment units will result in engine damage. |
The inlet and exhaust adjustment units are different.
VANOS is marked with IN for the inlet camshaft.
VANOS is marked with EX for the exhaust camshaft.
Scheme 470
Place adjustment units of exhaust camshaft marked EX on timing chain.
Position adjustment unit on exhaust camshaft and secure with central bolt (3).
The installation position of the adjustment units can be freely selected.
Scheme 471
Place adjustment units of inlet camshaft marked IN on timing chain.
Position adjustment unit on inlet camshaft and secure with central bolt (1).
The installation position of the adjustment units can be freely selected.
Install slide rail (2).
Insert screws (1).
Screw special tool 11 9 340 into cylinder head.
Pretension timing chain with special tool to 0.4 Nm .
Secure central bolt (1) with special tool 00 9 120 .
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Secure central bolt (1) with special tool 00 9 120 .
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Fit chain tensioner.
Check timing.
Assemble engine.