Positive Crankcase Ventilation: Description and Operation

Fig. 4 Positive crankcase ventilation system.:

Fig. 5 Positive crankcase ventilation system.:

Fig. 6 Positive crankcase ventilation system.:

Fig. 7 Positive crankcase ventilation system.:

This system, Figs. 4 through 7, is used to prevent blow-by gasses created within the engine from being emitted to the atmosphere. During engine operation, these blow-by gasses are drawn into the induction system and into the combustion chamber where they are burned along with the normal air/fuel mixture.