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The Vanos system is BMW's answer to variable valve timing. It is an electro hydraulic system
and it also often needs maintenance.
The later-model six-cylinder engines have a mechanism that allows for variable advancing
of the camshaft timing. We recomend watching our other Vanos video. The VANOS
unit is an electromechanical unit that uses a hydraulic piston to rotate the
camshaft timing at higher rpm. This unit is controlled electronically by a solenoid connected
to the engine management system DME, also called ECU.
Here we will show you how to replace the Vanos solenoid and hydraulic hose, which is often
ignored as a standard repair. The VANOS unit is hydraulically operated using
pressurized oil from the engine. The oil line that feeds the VANOS unit often
begins to crack and leak from age. It’s very common for this line to seep oil and
leak it on top of the engine. To replace it, you will need to remove the intake manifold
first, in order to gain access. Once the manifold has been removed, removal
of the line is as easy as disconnecting the two bolts on each side, and removing and replacing
the line. Use new aluminum or copper sealing washers when you install the
new line.
Also accessible, is the VANOS unit solenoid. This unit is responsible for actuating a valve
that opens and lets pressurized oil to flow into the VANOS timing chain sprocket
unit. To remove and replace this solenoid, you will also need to remove the intake manifold,
as the electrical connector for the solenoid is hidden under the manifold. Be sure to use
a new O-ring on the VANOS solenoid when you install its replacement. These two components
replacements makes the whole operation properly done. Don't forget the oil line and your vehicle
will keep working for a long time.