Filtration Racor - Parker Hannifin France SAS - #26

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Closed Crank Case Ventilation Systems The problem – open and unfiltered engine crankcase breathers, allow oil and soot ladened aerosol mist to enter the atmosphere from the crankcase. Environmental concerns and EPA and European legislation bans the emission of open and untreated crankcase gases into the atmosphere. To reduce total engine emissions, it is becoming necessary to close the crankcase breather system, by routing these gases back into the air intake system. Crankcase blowby is produced when combustion gases under high pressure are blown past the piston rings into the crankcase. As these blow by gases pass though the crankcase, they become contaminated with oil mist. Pictures below: (left) Cummins QSM11 marine engine with CCV cutaway. (right) Caterpillar 3196 marine engine with Racor CCV/AF System. CCV Systems A modern diesel engine schematic A schematic indicating air intake filtration, crankcase ventilation and water separation and fuel filtration in a modern diesel engine. Fuel Injection Pump Diesel Engine Fuel Tank Inlet Air Filter/ Silencer Compressor Exhaust Out Turbo Charger Aftercooler Clean Air In Flow of Crankcase Emissions Drain to Engine Drain CCV™ System Racor’s crankcase ventilation system removes these contaminations. The exhaust can then be allowed to be vented in the atmosphere. For applications requiring more stringent emissions requirements, a closed crankcase filter is recommended. In this application, the exhaust from the crankcase filter is routed to the inlet side of the turbo. A regulator in the crankcase filter controls the vacuum in the crankcase to ensure proper operation. 26