Since the piston rings cannot seal tightly enough, hot gases enter the crankcase. A mixture of hot oil and fuel vapors can create excessive pressure that adversely affects the crank mechanism. To avoid this, the gases must be sucked out of the engine via a connecting hose and incinerated.
Closed motor ventilation does not require maintenance.
Engine ventilation ranging from "idle to partial load"
1. Hot film air mass meter; 2. Cylinder head cover; 3. Oil separator chamber; Ventilation top partial/full load; 4. Intake air line; 5. Exhaust air line; Ventilation top partial/full load; 6. Throttle valve; 7. Choke with a diameter of 1.1 mm; 8. Suction tube; 9. Air bleed line 10. Power steering pump support; 11. Oil separator chamber; 12. Space for crank; 13. Oil recirculation pipe (siphon); 14. Oil pan; 15. Control case; 16. Crank body of the cylinder; 17. Cylinder head; 18. Chain case; A. Fresh air; B. Purge gases; D. Connector
A mixture of ventilated gases is sucked into the combustion chamber from the crank chamber (12) through the oil separator chamber (11) and the air removal line, as well as the throttle (7) in engine operating mode "idle to medium partial load". In the oil separator, the oil is separated from the gas mixture and enters through the outlet hole and outlet pipe (13) into the oil pan.
To prevent the penetration of slag into the engine oil, part of the fresh air taken in is separated in the connecting element (D) and is sent to the crank chamber through the exhaust air line (5), oil separator chamber (3), chaincase (18) and control body (15).