Vanos unit

VANOS Units

The infinitely variable double VANOS system uses a hydraulic oscillating motor type

VANOS units for the intake and the exhaust cams. Although they have identical function,

the oscillating motor VANOS units are a further development of the variable vane type

motor VANOS units used on previous systems. They are designed as an integrated

component in the chain drive and are mounted with a central bolt on the respective

camshaft. When de-pressurized, a coil spring holds the VANOS unit in the base position.

The VANOS units are controlled by oil pressure from the 4/3 proportional solenoid

valves. The valves are located in the front of the cylinder head and are controlled by the

ECM. The ECM regulates the VANOS based on factors such as engine RPM, load and

coolant temperature.

N52 Hydraulic oscillating motor/VANOS unit

     

Index	Explanation
1	Front plate
2	Locking pin
3	Oil channel
4	Casing with oil ring
5	Pressure chamber for advancing
6	Oscillating rotor
7	Pressure chamber for retarding
8	Oil channel

 

The VANOS units are controlled by oil pressure from the 4/3 proportional solenoid

valves. The valves are located in the front of the cylinder head and are controlled by the

ECM. The ECM regulates the VANOS based on factors such as engine RPM, load and

coolant temperature.

N52 VANOS system

Index	Explanation
1	VANOS unit, Exhaust
2	VANOS unit, Intake
3	Intake camshaft sensor
4	Exhaust camshaft sensor
5	VANOS solenoid valve
6	VANOS solenoid valve