Crankcase vapour/gas recirculation system

Description 1080D

1.1, 1.2 8v

The system controls crankcase emissions of vent gases consisting of mixtures of air, fuel vapours and burnt gases that leak through the piston rings and also lubricant oil vapours by redirecting them back to the engine so they can be burnt.

1.3 JTD 16v

Function

The oil vapour emissions are controlled by an oil separator (1) which collects the vapours released from the crankcase and from the tappet cover via the pipe (2). The condensed vapours pass through a pipe (3) returning to the sump, whilst the uncondensed vapours pass through a pipe (4) and are sent to the turbocharger air intake hose.

1 - Oil separator

2 - Oil vapour outlet from cover

3 - Return to the sump of condensed vapours

4 - Intake vapour pipe

1.1, 1.2 8v

The breather gases coming from the crankcase rise as far as the cylinder head and are directed (1) to two different intakes:

• with medium-high accelerator throttle openings, the gases are taken in through the port immediately downstream from the air cleaner (2);
• with small throttle openings (particularly when the engine is idling or in over-run), gases are taken in downstream of the throttle (3).