OIL VAPOUR RECIRCULATION SYSTEM

2.3 JTD 16V

Oil vapours that leak from the cylinder head extension cover and build up in the sump during engine operation are channeled into a condenser/separator filter known as the blow-by filter. The filter is divided into two sections:

• most of the vapours condense in the first, labyrinth section, and return to the sump;
• the second section contains a coalescence filter that condenses the remaining proportion of the vapours, which return to the sump through another umbrella valve.

The uncondensed vapour proportion is sent via a MANN-HUMMEL control valve to the intake duct and burnt during normal engine operation.

The blow-by filter cannot be dismantled and must therefore be replaced in its entirety.

• 1 MANN -HUMMEL control valve
• 2 Umbrella valve
• 3 Blow-by filter
• A - Labyrinth
• B - Intake oil vapour recovery flow
• C - Oil return flow to sump
• D - Oil vapour flow from sump
• E - Oil vapour flow from cylinder head extension
• F - Coalescence filter