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Crankcase Ventilation System
| Fig. 2.163. Location of the crankcase ventilation system and the direction of gas flow and fresh air in the engine DOHC: a - crankcase gases; b - the fresh air; 1 - the air filter; 2 - an air hose; 3 - throttle device; 4 - air expansion chamber; 5 - PCV valve; 6 - crankcase ventilation hose; 7 - the inlet manifold; 8 - the fuel injector; 9 - to the intake manifold; 10 - the piston; 11 - a spring; 12 - from the cylinder head cover
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| Fig. 2.164. Location of the crankcase ventilation system and the direction of gas flow and fresh air under different operating conditions of the engine V6: a - front view; b - rear view; a - operation at low load; d - operation under high load; e - the fresh air; 1, 6 - hoses breakthrough crankcase emissions; 2 - an air hose; 3 - crankcase ventilation hose; 4 - PCV valve; 5 - air hose
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When the engine through the gaps of the piston rings into the crankcase gets a small amount of exhaust gas. To gaskets engine is not subjected to too high stress and damage to the engine, the gases in the crankcase pressure must be discharged from the engine. To do this, the system is designed crankcase ventilation (Fig. 2.163, 2.164). For environmental protection crankcase gases are discharged into the intake tract of the engine. Ventilation hose is attached to the cylinder head cover. Periodically check if accumulated in this hose oil residues that are washed with petrol. Reducing the pressure in the combustion chambers shows the wear of pistons, piston rings and cylinder working surfaces, increases the amount of exhaust gas passing through the crankcase ventilation system that considerably after the opening of the oil filler plug. By the number of exiting exhaust gases can estimate the degree of deterioration of the motor.
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