17-4
2. Blowby Gas Return System
PCV: Positive Crankcase Ventilation
• The blowby gas return system returns blowby gases to an air duct to prevent them from being released to the out-
side air.
• The PCV valve keeps constant the pressure inside the crankcase.
• The oil in the blowby gas is separated by the wire mesh and the element in the PCV valve and is returned to the
oil pan.
• When the element is clogged, the regulator valve opens and the blowby gas is returned to the breather hose.
STRUCTURE AND OPERATION
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