Exhaust Emissions System - Crankcase Ventilation: Description

Jaguar's closed crankcase ventilation system is designed to prevent crankcase fumes and vapors from entering the atmosphere. An oil breather is fitted to cylinder head camshaft chamber. Located in breather is a wire mesh screen. On 6-cylinder engine, breather hose runs to a purge port. Vent hose from carbon canister is connected to this hose through a fixed orifice valve which continues to crankcase breather. On V12 engine, hoses from crankcase breather are connected to both intake manifolds and a variable orifice valve located in left hand air cleaner backing plate.