Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Right Side (N62/N62TU)
11 36 048 - Removing and installing/replacing inlet and exhaust adjustment units on right side (N62/N62TU)
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
(cylinder bank 1 to 4)
Necessary preliminary tasks:
- Read fault memory and make a documentary record
- Remove servomotor for right eccentric shaft Removing and Installing/Replacing Servomotor for Right Eccentric Shaft (N62/N62TU)
- Remove right cylinder head cover Removing and Installing/Sealing Right Cylinder Head Cover
- Remove all spark plugs on cylinder bank 1 to 4
- If necessary, remove fan cowl
- Remove right timing case cover Removing and Installing Top Right Timing Case Cover (N62 / N62TU)
Removal:
Removal of inlet and exhaust adjustment units is described separately from installation.
Important!
Screw (1) is a special screw and must not be replaced with a normal M8 screw.
Release screw (1).
Unclip oil line (3) from retainers (2) and remove.
Crank engine at central bolt in direction of rotation to firing TDC position of 1st cylinder.
Note:
In firing TDC position, cam of exhaust camshaft at 1st cylinder points upwards at an angle.
Cam of inlet camshaft points downwards at an angle.
Note:
Alignment hole for TDC position is at front on timing case cover.
Crank engine at central bolt and secure vibration damper with special tool 11 9 190 11 9 190 Plug Mandrel in firing TDC position of 1st cylinder.
Important!
When the engine is shut down, the inlet and exhaust adjustment unit is normally locked in its initial position.
The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the adjustment unit.
In order to avoid incorrect timing adjustment, it is essential to check the locking of the adjustment unit and if necessary perform locking by rotating the camshafts.
Checking locking of inlet adjustment unit in initial position:
Engage hexagon head of inlet camshaft and attempt to rotate inlet camshaft carefully against direction of rotation.
If there is no fixed connection between inlet camshaft and inlet adjustment unit, rotate inlet camshaft against direction of rotation as far as it will go.
The inlet adjustment unit is locked in the initial position when the inlet camshaft is non-positively connected to the inlet adjustment unit.
Checking locking of exhaust adjustment unit in initial position:
Engage hexagon head of exhaust camshaft and attempt to rotate exhaust camshaft carefully in direction of rotation.
If there is no fixed connection between exhaust camshaft and exhaust adjustment unit, rotate exhaust camshaft in direction of rotation as far as it will go.
The exhaust adjustment unit is locked in the initial position when the exhaust camshaft is non-positively connected to the exhaust adjustment unit.
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.
Remove special tool 11 9 190 11 9 190 Plug Mandrel.
Crank engine at central bolt against direction of rotation to 45° before TDC position.
Note:
When slackening screws, grip camshafts at hexagon head.
Slacken screws of exhaust and inlet adjustment unit.
Remove screw on inlet adjustment unit.
Vigorously press back tensioner rail (3) several times to remove oil in chain tensioner.
Feed out inlet adjustment unit (1).
Remove screw on exhaust adjustment unit.
Feed out exhaust adjustment unit (2).
Secure timing chain to prevent it from sliding down.
Installation:
Installation of inlet and exhaust adjustment units is described separately from removal.
Important!
Danger of mix-up:
Inlet and exhaust adjustment units are different.
Mixing up the inlet and exhaust adjustment units will cause damage to the engine.
1. Inlet adjustment unit (1) is marked with EIN and IN.
2. Exhaust adjustment unit (2) is marked with AUS and EX.
Note:
The exhaust adjustment unit on cylinder bank 1 to 4 also has a metal clip (3) for driving the vacuum pump.
Note:
Position of exhaust adjustment unit (2) to timing chain can be freely selected.
Pull timing chain up.
Feed exhaust adjustment unit (2) into timing chain and fit onto exhaust camshaft.
Replace screw.
Install screw on exhaust adjustment unit.
Tighten screw without play and then slacken off again by half a turn.
Note:
Position of inlet adjustment unit (1) to timing chain can be freely selected.
Pull timing chain up.
Feed inlet adjustment unit (1) into timing chain.
Press tensioner rail (3) back and fit inlet adjustment unit (1) onto inlet camshaft.
Note:
If tensioner rail (3) cannot be pressed back far enough to enable fitting of inlet adjustment unit (1):
Slacken off chain tensioner by approx. three turns.
Fit inlet adjustment unit (1).
Replace and insert screw on inlet adjustment unit (1).
Tighten down chain tensioner.
Tightening torque of chain tensioner, 11 31 8AZ 11 31 Camshaft.
Tighten screw on inlet adjustment unit without play and then slacken off again by a half turn.
Get special tool kit 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 and align inlet camshaft so that special tool 11 9 461 11 9 460 Gauge rests without a gap on cylinder head.
Fit special tool 11 9 463 11 9 460 Gauge, secure screw (1) in thread for oil line and tighten down by hand.
Important!
Make sure screws of inlet and exhaust adjustment units have been slackened off.
Crank engine at central bolt from 45° before TDC position in direction of rotation to firing TDC position.
Secure vibration damper with special tool 11 9 190 11 9 190 Plug Mandrel in firing TDC position of 1st cylinder.
Note:
When tightening down screw (1), grip camshaft at hexagon head.
Tighten down screw (1) of inlet adjustment unit.
Tightening torque 11 36 16AZ 11 36 Variable Camshaft Control VANOS.
Release screw (1) and remove special tools 11 9 463 11 9 460 Gauge /11 9 461 11 9 460 Gauge from inlet camshaft.
Place special tool 11 9 462 11 9 460 Gauge on exhaust camshaft and align exhaust camshaft so that special tool 11 9 462 11 9 460 Gauge rests without a gap on cylinder head.
Fit special tool 11 9 463 11 9 460 Gauge, secure screw (1) in thread for oil line and tighten down by hand.
Note:
When tightening down screw (2), grip camshaft at hexagon head.
Tighten down screw (2) of exhaust adjustment unit.
Tightening torque 11 36 16AZ 11 36 Variable Camshaft Control VANOS.
Release screw (1) and remove special tools 11 9 463 11 9 460 Gauge /11 9 462 11 9 460 Gauge from exhaust 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.
Place special tool 11 9 461 11 9 460 Gauge on inlet camshaft and check timing.
Note:
The timing is correctly adjusted when special tool 11 9 461 11 9 460 Gauge rests flat on the cylinder head or protrudes by up to 0.5 mm to the exhaust side.
Place special tool 11 9 462 11 9 460 Gauge on exhaust camshaft and check timing.
Note:
The timing is correctly adjusted when special tool 11 9 462 11 9 460 Gauge rests flat on the cylinder head or protrudes by up to 0.5 mm to the exhaust side.
Remove all special tools.
Important!
Screw (1) is a special screw and must not be replaced with a normal M8 screw.
Clip oil line (3) into retainers (2).
Insert screw (1) and tighten down.
Assemble engine.