Crankcase Ventilation Systems: Description
All models use a closed crankcase system to prevent crankcase fumes from entering into the atmosphere. An oil breather is fitted to the valve cover or camshaft cover. A wire mesh screen flame arrestor is located in the breather cap. A purge tube runs to the intake manifold, with an orifice or restrictor to limit the air flow. On all models, the crankcase fumes are vented to a charcoal canister when the engine is not running.