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The Functions of the Positive Crankcase Ventilation (PCV) in Your Car

March 13, 2016 | Engine Info

The function of a Positive Crankcase Ventilation (PCV) works towards the removal of hazardous fumes from your cars’ engine as well as preventing those fumes from expelling into the environment. The system works best by means of manifold vacuum to remove the harmful fumes from your car’s crankcase and expels them into the vehicle’s intake manifold. The PCV system helps in transferring the emissions that have fuel and air mixture into the combustion chambers of the vehicle in their burnt form. The PCV Valve helps in controlling the circulation or flow of air within the vehicle’s system, which makes it an effective tool for not only controlling environmental pollution, but also ventilating the crankcase system.

Positive Crankcase Ventilation

Approximately 20 percent of all hydrocarbon emissions that your car produces are dangerous fumes that force their way through the piston rings to access the crankcase. Therefore, if your car has a higher mileage on its engine, then it is obvious that the piston rings and cylinders will have greater wear and tear due to the effects of the harmful vapors accessing the crankcase. Due to the Positive Crankcase Ventilation function, the usefulness of the valve does not only remove the harmful fumes, but also maintains the shape of your vehicle’s engine and provides it with the best way of economizing fuel.

The PCV valve stand out as the main component of this system. The valve is a simple part loaded with springs that has a gliding pintle inside it. The elongated pintle takes the shape of a bullet with the intention of increasing or decreasing the flow of air in line with its position in the housing of the valve. The up and down sliding of the pintle help in changing the outlet for regulating the bulk of air flowing through the PCV valve. Typically, the location of the PCV valve is in the intake valley, making it fit perfectly into the elastic perforation. This strategic position of the valve gives it ample time of pulling the harmful fumes from the interiors of your car engine without drawing oil from the crankcase.

At the tops of the PCV valve, a hose connects itself to a vacuum port on body of the intake manifold, carburetor or throttle body. As such, it allows the siphoning of the fumes to be directed into your car’s engine without sticking itself up the carburetor or the throttle body. However, you should take precautionary measures while disconnecting or taking out the PCV system with the intention of improving the performance of your engine because it is illegal and does not improve anything. The rules of the Environmental Protection Agency outlaws any kind of interference with the any device for controlling emissions. Therefore, the deactivation or detachment of the PCV system can lead to the accumulation of smoke in the crankcase, which reduces oil life and encourages the development of sludge.

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You should never clean a PCV valve and place it back to service your car. If you realize the valve looks sticky or has some sludge, consider its replacement immediately. However, you can regularly clean and inspect all hoses or tubes that the PCV system uses. Any evidence of breaks or cracks on the hoses means that you should replace them with new ones. You should also inspect all hose connections to ensure they are airtight sealed. Hence, proper examining of the PCV valve system helps in reducing all the emissions produced by the vehicle.

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