Crankcase vapour/gas recirculation system

Description 1080D

1.9 JTD 8V

SPECIFICATIONS:

Operation

The oil vapour emissions are controlled by the pipe (4) which collects the vapours released from the crankcase and the rocker cover (1) which causes their partial condensation.

The uncondensed vapours are sent, through a pipe (5), to the turbocharger air inlet hose (3).

1 - Rocker cover

2 - Turbocharger

3 - Corrugated hose

4 - Oil vapour recovery pipe

5 - Oil vapour recirculation pipe

A regulating valve on the rocker cover, consisting of a spring (1) and diaphragm (2), prevents faulty intake phenomena.

When the vacuum values present under the rocker cover exceed a specified limit, the diaphragm moves downwards and blocks the pipe coming from the crankcase.

1.9 JTD 16V

SPECIFCATIONS

Operation

The oil vapour emissions are controlled by a separator (1) which collects the vapours released from the crankcase (2) and from the tappet cover (3). The condensed vapours pass through a pipe (4) returning to the sump, whilst the uncondensed vapours pass through a pipe (5) and are sent to the turbocharger air intake hose.

1 - Oil separator

2 - Crankcase oil vapour outlet

3 - Tappet cover oil vapour outlet

4 - Return to the sump of condensed vapours

5 - Intake vapour pipe

6 - Regulation valve

There is a regulation valve (6) on the intake vapours pipe (5) 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 this pipe (5) exceeds the calibration, the spring moves the diaphragm closing the duct from the oil separator thereby preventing the intake of oil from the sump.