Crankcase Ventilation Systems: Description

All 1965-74 Jeep vehicles are equipped with a closed positive crankcase ventilating system. System consists of a sealed oil filler cap, PCV valve connected between an intake manifold vacuum source and engine, air filter located in air cleaner connecting hose (6-cylinder only) and various hoses and connections. On some 1972-73 models, evaporation control system is interconnected with crankcase ventilation system.