Removing and Installing/Replacing Inlet and Exhaust VANOS on Right Side (N73)
11 36 048 - Removing and installing/replacing inlet and exhaust VANOS on right side (N73)
Special tools required:
- 11 9 190 11 9 190 Plug Mandrel
- 11 9 460 11 9 460 Gauge
- 11 9 461 11 9 460 Gauge
- 11 9 462 11 9 460 Gauge
- 11 9 463 11 9 460 Gauge
Cylinders 1 to 6.
Necessary preliminary tasks:
- Read fault memory and make a documentary record.
- Remove right cylinder head cover Removing and Installing/Sealing Right Cylinder Head Cover.
- Remove spark plugs Service and Repair.
- Remove vacuum pump Service and Repair.
- Remove right VANOS solenoid valves Removing and Installing/Replacing Both Solenoid Valves on Right Side.
- Remove right timing case cover Removing and Installing Top Right Timing Case Cover (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 11 9 190 Plug Mandrel in firing TDC position of 1st cylinder.
Note:
Special tool bore as (N62).
Note:
With 1st cylinder in firing TDC position, cams of inlet and exhaust camshafts at 1st cylinder point towards each other at an angle.
Important!
Screw (1) must not be replaced by an M8 screw (special screw).
Unscrew bolt (1).
Unclip oil line (3) from retainers (2) and remove.
Important!
The adjustment units are locked in an initial position when the engine is switched off.
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 exhaust 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.
Important!
If the inlet or exhaust adjustment unit of the camshafts "cannot" be locked as described, the adjustment unit is faulty and must be replaced.
Slacken screws of inlet and exhaust VANOS.
Note:
When slackening screws, grip camshafts at hexagon head.
Remove screw from inlet VANOS (1).
Vigorously press back tensioner rail (3) several times to remove oil in chain tensioner.
Feed out and remove inlet VANOS (1).
Remove screw from exhaust VANOS (2).
Feed out and remove exhaust VANOS (2).
Secure timing chain to prevent it from sliding down.
The removal work finishes at this point.
Important!
Danger of mixing up adjustment units.
The inlet and exhaust adjustment units are different.
Mixing up the adjustment units will result in engine damage.
1 - The inlet VANOS (1) is identified with EIN and IN.
2 - The exhaust VANOS (2) is identified with AUS and EX.
Note:
The exhaust VANOS of cylinder bank 1 to 6 also has a metal clip for the vacuum pump drive.
Feed exhaust VANOS (2) into timing chain and fit onto exhaust camshaft.
Installation:
Position of exhaust VANOS (2) in relation to timing chain can be freely selected.
Installation:
Replace screw.
Tighten screw without play and then slacken off again by half a turn.
Feed inlet VANOS (1) into timing chain. Press back tensioning rail (3) then place on inlet camshaft.
Installation:
Position of inlet VANOS (1) can be freely selected.
Remove chain tensioner if tensioning rail (3) cannot be pressed back.
Compress chain tensioner slowly and carefully.
Repeat procedure twice, reinstall chain tensioner and tighten down.
Installation:
Tightening torque for chain tensioner 11 31 8AZ 11 31 Camshaft.
Replace sealing ring.
Installation:
Replace screw.
Tighten screw without play and then slacken off again by half a turn.
Get special tool 11 9 460 11 9 460 Gauge ready for securing camshafts.
Note:
Special tool 11 9 461 11 9 460 Gauge for securing inlet camshaft.
Special tool 11 9 462 11 9 460 Gauge for securing exhaust camshaft.
Special tool 11 9 463 11 9 460 Gauge (holder with screw).
Place special tool 11 9 461 11 9 460 Gauge on inlet camshaft.
Installation:
Place special tool 11 9 461 11 9 460 Gauge flat on cylinder head, align inlet camshaft if necessary.
Fit special tool 11 9 463 11 9 460 Gauge, insert screw (1) in thread for oil line and secure special tool 11 9 461 11 9 460 Gauge in position.
Tighten down special tool 11 9 463 11 9 460 Gauge by hand.
Tighten down screw (1) of inlet adjustment unit.
Installation:
Tightening torque 11 36 16AZ 11 36 Variable Camshaft Control VANOS
When tightening down screw (1), grip inlet camshaft at hexagon head.
Release screw (1), remove special tools 11 9 463 11 9 460 Gauge and 11 9 461 11 9 460 Gauge from inlet camshaft.
Place special tool 11 9 462 11 9 460 Gauge on exhaust camshaft.
Installation:
Place special tool 11 9 462 11 9 460 Gauge flat on cylinder head, align exhaust camshaft if necessary.
Fit special tool 11 9 463 11 9 460 Gauge, insert screw (1) in thread for oil line and secure special tool 11 9 462 11 9 460 Gauge in position.
Tighten down special tool 11 9 463 11 9 460 Gauge by hand.
Tighten down screw (2) of exhaust VANOS.
Installation:
Tightening torque 11 36 16AZ 11 36 Variable Camshaft Control VANOS
When tightening down screw (2), grip exhaust camshaft at hexagon head.
Release screw (1), remove special tools 11 9 463 11 9 460 Gauge and 11 9 462 11 9 460 Gauge from inlet camshaft.
Remove special tool 11 9 190 11 9 190 Plug Mandrel.
Crank engine at central bolt twice in direction of rotation until engine returns to firing TDC position of 1st cylinder.
Secure vibration damper with special tool 11 9 190 11 9 190 Plug Mandrel in firing TDC position of 1st cylinder.
Fit special tools 11 9 461 11 9 460 Gauge and 11 9 462 11 9 460 Gauge again for checking purposes and check valve timing.
Note:
The timing is correctly adjusted when special tools 11 9 461 11 9 460 Gauge and 11 9 462 11 9 460 Gauge rest flat on the cylinder head or protrude by up to 0.5 mm to the exhaust side.
Remove all special tools.
Assemble engine.