Flushing the system
To flush, disconnect hoses 4 and 5 (pic. 2-75) of the ventilation system from the branch pipes, remove the flame arrester 3 from the exhaust hoses 5, remove the cover 6 of the oil separator 7 and wash them with gasoline or kerosene.
Pic. 2-75. Engine crankcase ventilation scheme:
1 - air filter element; 2 - exhaust manifold; 3 - flame arrester; 4 - a hose for venting gases into the throttle space of the carburetor; 5 - exhaust hose; 6 - oil separator cover; 7 - oil separator; 8 - oil separator drain pipe.
It is also necessary to wash and blow with compressed air the carburetor pipe to suck crankcase gases into the throttle space through which the exhausted gases pass.