Blowby Gas Return System - Mitsubishi 6M70 Workshop Manual

2. Blowby Gas Return System

• The blowby gas return system is designed to introduce blowby gases into the intake air duct for reburning, thus
preventing the gases from being released to the atmosphere.
• The positive crankcase ventilation 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 oil separator and the positive
crankcase ventilation valve and is returned to the oil pan.
• When the element is clogged, the regulator valve opens and the blowby gas flows to the positive crankcase venti-
lation hose without passing through the element.
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