What is a CCV on a Diesel?

Crankcase Ventilation

Crankcase blowby gases can be an important source of particulate emissions, as well as other regulated and unregulated emissions. They can also contribute to the loss of lubricating oil and to fouling of surfaces and engine components. A number of crankcase ventilation systems have been developed which include various types of filters to separate particulate emissions.

The crankcase of a combustion engine accumulates gases and oil mist—called blowby—that can leak from several sources. The most important source of blowby is the combustion chamber, Most of the combustion blowby occurs when the combustion chamber pressure reaches a maximum, during the compression and the expansion strokes. At high pressures, the gases leak to the crankcase around the piston rings and through the piston ring gap.

Other important sources of blowby include the turbocharger shaft, air compressors and in some cases the valve stems. In total, these components can be responsible for as much as 40% of the crankcase blowby. Turbochargers and air compressors are often lubricated with oil supplied by the engine’s oil pump and drained back into the engine’s crankcase. The oil drain line from these components ensures that gas leaking past the turbocharger shaft and the piston rings of an air compressor will pass into the engine crankcase contributing to blowby.


Closed Crankcase Ventilation (CCV): Prevent oil droplets from re-entering the intake system, reducing oil deposits in the engine.
When the oil in the truck heats up condensation occurs. The OEM crankcase vent system (CCV) allows the gas to escape; however, due to stricter emission standards, the gases are now recirculated into a closed system introducing them back into the intake system. The reintroduction of oil vapor can cause valve gumming,intake sludge, and a reduction of engine power and performance. The CCV Reroute Kit vents crankcase pressure by uses a venturi style design that eliminates the need for a restrictive baffle. Instead, it is intended to catch oil prior to the hose resulting in virtually no oil loss. The base of the nipple is designed to catch oil prior to the hose so there are no restrictions in the system. Our ¾ inch 100% silicone reinforced hose has a streamline fitment, routing over the brake booster, allowing better pressure flow.

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Post time: Mar-07-2023