4. INSTRUCTIONS
VS4895 must be used in conjunction with VS4425 kit for engine timing
applications involving the Vanos Adjustment Units (Variable Valve Control
System).
4.1.
Checking camshaft timing
On M52TU, M54 and M56 engines, with Twin Vanos Adjustment
Units, the procedure for checking camshaft timing is identical to
the range of engines - M42, M44, M50 and M52 which have a
single Vanos unit - using the Flywheel Locking Pin
VS118/02
,
Camshaft Setting Plate Assembly (
VS4310.01
,
VS4310.02
,
VS4309.04
and
VS4309.05
), and Tensioner Pre-load Tool
VS4323
from Setting/Locking Kit
VS4425
.
However, for M52TU, M54 and M56 engines with a Twin Vanos Unit,
it is also necessary to use the special tools from
VS4895
kit in
conjunction with those in
VS4425
kit, as it is necessary to ensure
that the Vanos Units are positioned correctly relative to the
camshafts.
Remove the timing chain tensioner and insert in its place
VS4323
Pre-load Tool (from
VS4425
kit)
(Fig.1)
.
Pre-load the tensioning rail by applying a torque of 0.7Nm to the
Adjusting Screw of
VS4323
.
VS4896 Compressed Air Connector.
Unscrew the oil pressure pipe to the Vanos Unit and insert
VS4896
Connector and connect a compressed air supply to pressurise the
Vanos unit between 2 and 8 bar
(Fig.2)
.
WARNING: Some oil may be forced out of the Vanos Unit when
compressed air is introduced. Cover unit with a suitable cloth.
It is possible that the camshafts will not be in the correct position
when the engine is switched off.
Therefore, with the compressed air supply connected, turn the
engine over at least two revolutions, in the normal direction of
rotation, and return to a position where the camshaft lobes of the
inlet and exhaust camshafts on the first cylinder, face each other
(Fig.3)
.
Check engine timing position by fitting
VS118/02
Flywheel Locking
Pin and
VS4309
Camshaft Setting Plate Assembly (
VS4310.01
,
VS4310.02
,
VS4309.04
,
VS4309.05
) from
VS4425
kit
(Fig.4)
.
NOTE: The Camshaft Setting Plate Assembly must rest fully on the
surface of the cylinder head for engine timing position to be correct.
Remove all tools and install the timing chain tensioner
4.2.
Removing and Replacing the Twin Vanos Adjustment Unit
Remove intake filter housing with mass sensor, fan assembly/fan
cowl, cylinder head cover and spark plugs.
Remove the plastic cover for the inlet camshaft.
4.2.1. Removal
Follow the same procedure as described for -
4.1. Checking
camshaft timing.
When procedure has been completed, leave the
VS118/02
Flywheel
Locking Pin and the Camshaft Setting Plate Assembly in-situ and
disconnect the compressed air supply (leave
VS4896
Connector in
place).
Remove the Vanos Adjustment Unit sensor plugs
(Fig.5)
.
NOTE:
Oil will escape from the Vanos Unit when the sensor plugs
are removed - catch the oil in a suitable container to ensure that oil
does not spill onto the auxiliary belt.
Remove sealing caps using a pair of long nosed pliers
(Fig.6)
, and
unscrew the screws (TX30) on inlet and exhaust sides
(Fig.7)
.
WARNING: These screws have Left-Hand threads.
Detach the camshaft sensor plug and solenoid valve plug on inlet
and exhaust and remove the suspending bracket.
Unscrew all the nuts securing the Vanos Adjustment Unit and
remove the Unit.
4.2.2. Installation
Prior to installing the Vanos Adjustment Unit, check the dowel
sleeves for damage.
Sealing surfaces must be clean. Use recommended sealing
compound on contact surface and replace seal.
Install the Vanos Adjustment Unit, screw on nuts tighten to secure
unit in place.
Attach the camshaft sensor and solenoid valve plugs.
Insert securing screws on inlet and exhaust sides.
WARNING: Left-Hand threads and tighten to specified torque.
Replace the seal caps and screw plugs with new sealing rings.
Tighten to specified torque.
Remove all tools and carry out the procedure for
- 4.1 Checking
camshaft timing.
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
VS4895 - 1 - 210207
Fig.6
Fig.7
Fig.8
Fig.9
Fig.10
