Oil Separator: Description and Operation

Fine oil separator

A valve (5) is installed below the oil reservoir (4) which either allows or prevents the reservoir from being emptied depending on the vacuum.

Since the valve is open only when a vacuum is present, the reservoir size is chosen so that it has sufficient capacity to store a corresponding volume until the vehicle has to be refuelled even if the vehicle is operated only at full throttle so that the reservoir is never emptied.







Internal design of the oil separator







Separation of small quantities of blow-by gases

If there is only a small amount of blow-by gases, these enter the cyclone, where air is separated from oil. The oil then passes into the reservoir, while the air is routed out of the tank and fed back to the engine by the intake system.







Separation of larger quantities of blow-by gases

If the blow-by gases increase as a result of higher engine speeds, for example, the two pressure control valves open and an additional bypass is opened in order to separate the oil. The air is again fed to the engine and the oil goes into the reservoir. The oil reservoir is always drained whenever there is a vacuum in the system, i.e. permanently, except for at full throttle.