Where is the crankcase ventilation valve located?
1 Answers
The crankcase ventilation check valve is installed on the valve cover. It automatically controls the circulation volume of crankcase blow-by gas based on changes in intake vacuum under different engine operating conditions. If the crankcase ventilation check valve is damaged, it will cause increased pressure inside the crankcase, accelerated engine oil consumption, and also affect exhaust emissions. Function of crankcase ventilation valve: During the power stroke of the piston, some high-temperature, high-pressure exhaust gases in the cylinder (which increase with vehicle age) will leak down into the crankcase through the piston ring gaps. This gradual accumulation will cause pressure to rise inside the crankcase. Therefore, a ventilation system needs to be designed to gradually release this pressure while maintaining reasonable crankcase pressure levels. Composition of crankcase forced ventilation system: When referring to the crankcase forced ventilation system, people usually think of the oil-gas separation system and crankcase pressure control system. However, a complete crankcase forced ventilation system should include five parts: ventilation chamber, oil-gas separation system, crankcase pressure control system, oil return chamber, and breather pipe. Among these, the ventilation chamber and oil return chamber are generally arranged in the engine block, running through the cylinder head, engine block, and crankcase. The oil-gas separation system and crankcase pressure control system are particularly important in the entire system.
