PCV System: Description

A closed crankcase ventilation system is used to prevent crankcase fumes from entering into the atmosphere. The XJ6 III system consists of an oil breather fitted to the valve cover or crankcase cover. A wire mesh screen flame arrester is located in the breather cap.

A purge tube runs to the intake manifold, with an orifice or restrictor to limit the air flow. The crankcase fumes are vented to a charcoal canister when the engine is not running.

The XJS system consists of a breather housing, a 2-outlet chamber in the air cleaner backplate, and a variable orifice valve.