Positive Crankcase Ventilation System (PCV)
Tamper Proof Positive Crankcase Ventilation (PCV) Valve - Fresh Air: Do not attempt to remove the PCV valve by prying or twisting the PCV valve to separate the valve from the mating cover or component. Prying or twisting the PCV valve will result in fracture of one or more valve retention tabs which can fall into the engine resulting in internal engine damage. Remove the PCV valve mating cover or component from the engine before attempting to remove the PCV valve.
Fresh air is drawn in through the air duct or air induction system, through the positive crankcase ventilation (PCV) system starting with the crankcase. The blow-by flows from the crankcase through 4 rising channels into the pre separator (3). In the pre separator the first oil separation starts and the separated oil drains through two oil drain channels. One channel under oil level into oil pan and one ends in the block over oil level but with a check valve. The blow-by flows internal from the pre separator through block and head into the fine separator (2). In the fine separator assembly the blow-by flows through a fine oil separator and the pressure regulation valve (PRV). The fine separator has an internal oil drain channel under oil level with a check valve. After blow-by has passed the PRV it can flow through the primary or secondary check valve. The primary duct is routed internally through cylinder head into the intake manifold (4). The secondary duct (turbo mode) is routed internally in the head, camshaft carrier and then external through The PCV hose (1) is connected to turbocharger housing. At transversal applications the PCV hose material is rubber. The fresh air valve is tamper proof connector in the front cover. The PCV connector is assembled to the hose via clamps. Crankcase Ventilation System Inspection/Diagnosis