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Using a closed crankcase ventilation (CCV) system on your diesel powered truck is a crucial way that helps to contribute to the reduction of emissions that your vehicles generates.

The CCV system is necessary to stop the blow-by from escaping into the atmosphere from the cylinders. This blow-by consists of the same gases that are traveling down the exhaust system. The blow-by is a very small amount of the gases that leak by the compression rings on each cylinder during the ignition cycle of the engine.

The following video is what you do not want in your diesel truck engine compartment or cab.

CCV pressure

Alot of vapor coming out. Blowby, head gasket, cavitation?

Once this gas leaves the compression chamber, it is then in the crankcase. Many of the older style engines would just vent this gas off into the atmosphere to prevent a buildup in the crank case. This was done by a vent on the valve cover.

Today, this gas is channeled back into the combustion chamber by being mixed with the fresh air and fuel mixture of the engine. This allows the gases to be reignited and burn up any fuel that was not completely done the first time. It also helps to break down some of the hazardous components of the exhaust gases.

To assist in the collection of the blow-by gases, the vacuum from the supercharger is used to suck the gases up and channel it into the intake manifold for reintroduction to the chamber. This not only improves the fuel efficiency of the engine but also eliminates the amount of toxic fumes that enter the passenger compartment that is behind the engines from the old style vents.

Another benefit of the closed crankcase ventilation system is the reduction of oil usage by the engine because it is kept cleaner, which helps to reduce maintenance cost of the engine.

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