Crankcase Ventilation open spaces are ducted through a pipe that opens to the atmosphere near the bottom of the engine. Lubricant becomes a mist in many areas of the engine as the result of the motion of the parts (e.g., rocker arms, pistons, crankshaft, camshaft and rocker shaft). The mist rides the drafts of air and other gases that circulate in the open spaces in the engine. To prevent pressure buildup, the The crankcase ventilation (CCV) system separates the oily mist from the gases by centrifugal force. The oil returns to the oil pan. The remainder escapes to the atmosphere.
21 Figure 21 — Crankcase Ventilation System Separator A turbine in the CCV separator, driven by a small stream of oil striking its fins, spins at high speed. The mixture of gases and oily mist trapped in the valve cover and the timing gear cover drains onto the top of the center of the turbine and runs down onto several discs rotating with the turbine. Separation occurs as the mixture, flung outward by the turbine, strikes the walls of the CCV. The droplets of mist coalesce into a liquid and drain back into the oil pan along with the oil that drives the turbine. The gases are free to leave via an open port.
The open port connects to a tube leading to the bottom of the engine where road draft draws the gases into the atmosphere. Page 27 DESCRIPTION AND OPERATION 1. Seal Ring 2. Separator Inlet Hose 3. Separator Vent Tube 4. Vent Tube Bracket 5. Separator Housing 6. Housing Seal 7. Pressure Regulator