| 摘要 |
A crank-case ventilation filter set. A crankcase ventilation filter filters oil from blow-by gas. An inlet pipe transports the blow-by gas from an engine to the filter. An outlet pipe transports the blow-by gas from the filter to an intake device. An oil return pipe transports oil, such as by gravity, from the filter to an oil pan provided at a lower portion of the engine. A valve for preventing back-flow of oil is provided in the oil return pipe. The valve is disposed in the oil pan above an oil top limit line of the oil pan.
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