Blow-by gas recirculation diagram

BLOW-BY GAS RECIRCULATION DIAGRAM

The system controls emission, from the engine block, of vent gases made up of air-fuel mixtures, burnt gases which leak through piston rings and lubricant oil vapours by recirculating them to the intake.

With the accelerator throttle open, vent gases from the engine block reach the sleeve connecting the air cleaner-butterfly valve case (4) through pipe (2). This contains a flame trap (1) which prevents combustion caused by flame flashing back from the butterfly valve case (6).

With the throttle closed (engine idling), the vacuum in the intake manifold takes up gas (in limited quantities) directly through the pipe (3) and calibrated hole (6).