1975-76 Models

When engine is running with low load (high vacuum), crankcase vapors are drawn out of rocker arm cover into intake manifold. During high load (low vacuum) engine operation, crankcase vapors are drawn into the air cleaner through carburetor and into the combustion chambers. Oil in vapor is separated by oil separator (camshaft chain sprocket). There is also a steel mesh filter at the breather hose air cleaner connection which further separates the oil.