Special tools required:
- 11 9 190. See 11 9 190 PLUG MANDREL
- 11 9 461. See 11 9 460 GAUGE
- 11 9 462. See 11 9 460 GAUGE
- 11 9 463. See 11 9 460 GAUGE
Cylinders 7 to 12.
Necessary preliminary tasks:
- Remove intake air manifold. See 11 61 050 Removing and Installing Intake Air Manifold (N73)
- Remove left cylinder head cover. See 11 12 005 Removing and Installing/Sealing Left Cylinder Head Cover (N73)
- Remove all spark plugs. See 12 12 011 REPLACING ALL SPARK PLUGS (N73)
- Remove fan. See 11 52 020 Removing and Installing Or Replacing Fan Clutch (N73)
Crank engine at central bolt in direction of rotation to firing TDC position of 1st cylinder.
Secure vibration damper with special tool 11 9 190 in firing TDC position of 1st cylinder. See 11 9 190 PLUG MANDREL
Cams on inlet and exhaust camshafts at 7th cylinder are inclined upwards.
Release screw (1).
Unclip oil line (3) from retainer (2) and remove.
In individual cases this initial position is not achieved and the camshaft remains rotatable in the VANOS adjustment range.
In order to avoid incorrect timing adjustment, it is necessary to check the locking of the VANOS and if necessary perform locking by rotating the camshafts.
Locking check (inlet):
Engage hexagon head of camshaft at front and rotate inlet camshaft carefully against direction of rotation.
The inlet VANOS is locked in the initial position when the inlet camshaft is non-positively connected to the inlet VANOS.
Locking check (exhaust):
Engage hexagon head of camshaft at front and rotate exhaust camshaft carefully in direction of rotation.
The exhaust VANOS is locked in the initial position when the exhaust camshaft is non-positively connected to the exhaust VANOS.
Special tool 11 9 461 for securing inlet camshaft. See 11 9 460 GAUGE
Special tool 11 9 462 for securing exhaust camshaft. See 11 9 460 GAUGE
Special tool 11 9 463 (holder with screw). See 11 9 460 GAUGE
Fit special tool 11 9 461 on inlet camshaft. See 11 9 460 GAUGE
Insert special tool 11 9 463 in thread of oil line and tighten down by hand with screw (1). See 11 9 460 GAUGE
Place special tool 11 9 462 on exhaust camshaft. See 11 9 460 GAUGE
Insert special tool 11 9 463 in thread of oil line and tighten down by hand with screw (1). See 11 9 460 GAUGE
Remove all special tools.
Assemble engine.