what is the purpose of mini cooper non return valve job
All Cooper S models uses 1 Non-Return Valve per cylinder head Sold Each. The Non-Return Valve is connected in series with the solenoid valve for VANOS actuation and its purpose is to prevent the VANOS and its oil channels from running dry. Filter and solenoid valve Filter in the oil supply to the solenoid valve protects control piston and the VANOS unit from impurities greater than 100 microns.