Crankcase vapour/gas recirculation system
- Make
- Fiat
- Model
- Ulysse Factory Service Manual
- Year
- 2002–2010
- Section
- Emission control system › Crankcase vapour/gas recirculation system
CRANKCASE VAPOUR/GAS RECIRCULATION SYSTEM
DESCRIPTION
The oil vapour emissions are controlled by means of an oil separator which collects the vapours coming from the crankcase and from the tappet cover.
The condensed vapours return to the sump, via a pipe, whilst the uncondensed vapours are sent, via a pipe to the turbocharger air inlet hose.
OPERATION
There is a regulation valve, on the inlet vapour delivery pipe, with a spring that in normal conditions acts on a diaphragm keeping it open, thereby allowing the flow of oil vapours coming from the oil separator.
When the vacuum inside the pipe overcomes the calibration of spring, the diaphragm moves thereby closing the duct from the oil vapour separator preventing the intake of oil from the sump.
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