Positive Crankcase Ventilation: Description

Fig 1: Identifying Positive Crankcase Ventilation Description

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Identifying PCV Position Based On Vehicle Speed

Courtesy of NISSAN MOTOR CO., U.S.A.

This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold.

During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV valve.

Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.

The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover.

Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the

hose connection in the reverse direction.

On vehicle with an excessively high blow-by, the valve does not meet the requirement. This is because some of the flow will go through the hose connection to the air inlet tubes under all conditions.