Fig. 7.25. Scheme of compulsory ventilation of a case: 1–PCV valve; 2–karterny gases; 3–fresh air

The system of compulsory ventilation of a case provides a suction from a case of karterny gases and паров fuels in the inlet pipeline of the engine therefore pressure increase in a case because of penetration into it fulfilled gases and their emission in the atmosphere (fig. 7.25) is excluded . Karternye gases mix up with fresh air and via the valve of compulsory ventilation of a case move to an inlet collector.

The main components of system of compulsory ventilation of a case are the valve, the filter and vacuum hoses.

For support of frequency of rotation of idling the PCV valve limits a passed stream, when vacuum in an inlet collector the high. If break of the fulfilled gases in a case the engine big, for example, at wear of piston rings, the system of compulsory ventilation of a case directs karterny gases to the air filter where they are burned further in engine cylinders.

Check of the valve of compulsory ventilation of a case is given in section 2.