Diagram Of Crankcase Gas Recirculation System (Blow-By) - Fiat Bravo Service Manual

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D I A G R A M OF C R A N K C A S E GAS R E C I R C U L A T I O N S Y S T E M ( B L O W - B Y )

4. Throttle body

5. Pipe for exhaust gas recirculation during idling

6. Calibrated hole

The system controls the emissions, from the crankcase, of the vent gases which consist of air-petrol mix-

tures and burnt gases leaking through the piston rings, and also lubricating oil vapours, and recirculates

them to the inlet.

With the throttle valve open, the vent gases coming from the crankcase reach the connecting duct be-

tween the air cleaner-throttle body (3) through the pipe ( 2 ) , inside which there is a flame trap (1) to

prevent combustion phenomena due to flame returns from the throttle body (4).

With the throttle valve closed (engine idling), the vacuum in the inlet manifold draws in the gases (in a

small quantity) directly through the pipe (5) and calibrated hole ( 6 ) .