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An oil drain tube is provided for an internal combustion engine, which prevents oil draining from an oil separator from encountering blowby gases. The oil drain tube includes a first non-horizontal tube portion in direct fluid communication with the oil separator, a second non-horizontal tube portio

An oil drain tube is provided for an internal combustion engine, which prevents oil draining from an oil separator from encountering blowby gases. The oil drain tube includes a first non-horizontal tube portion in direct fluid communication with the oil separator, a second non-horizontal tube portion in direct fluid communication with an oil sump and a tube portion connecting the first non-horizontal tube portion and the second non-horizontal tube portion in fluid communication with one another.

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An oil drain tube is provided for an internal combustion engine, which prevents oil draining from an oil separator from encountering blowby gases. The oil drain tube includes a first non-horizontal tube portion in direct fluid communication with the oil separator, a second non-horizontal tube portio

An oil drain tube is provided for an internal combustion engine, which prevents oil draining from an oil separator from encountering blowby gases. The oil drain tube includes a first non-horizontal tube portion in direct fluid communication with the oil separator, a second non-horizontal tube portion in direct fluid communication with an oil sump and a tube portion connecting the first non-horizontal tube portion and the second non-horizontal tube portion in fluid communication with one another. ecess of said casing. 4. A position detecting sensor according to claim 3, further comprising a sealing member mounted on said mounting surface of said sensor body for said cylinder, for blocking invasion of liquid. 5. A position detecting sensor for detecting a position of a piston fitted in a cylinder chamber in a cylinder tube, comprising: a detecting element for detecting a magnetic field of a magnet fitted on a piston; and a sensor body enclosing said detecting element, wherein said sensor body has an outer periphery formed of surfaces curved convexly outward and a chamfered portion, and further comprising screw members adapted to be inserted into mounting holes for mounting said sensor body on a side surface of said cylinder, wherein sealing members are provided at heads of said screw members for blocking invasion of liquid into said mounting holes. 6. A position detecting sensor for detecting a position of a piston fitted in a cylinder chamber in a cylinder tube, comprising: a detecting element for detecting a magnetic field of a magnet fitted on a piston; and a sensor body enclosing said detecting element, wherein: said sensor body has an outer periphery formed of surfaces curved convexly outward and a chamfered portion; said sensor body includes a casing and a cover member adapted to be removably mounted on said casing; said casing has slots formed therein and adapted to be engaged by screw members to be screwed in a side surface of a cylinder; and said casing can be displaced along said slots. 7. A position detecting sensor for detecting a position of a piston fitted in a cylinder chamber in a cylinder tube, comprising: a detecting element for detecting a magnetic field of a magnet fitted on a piston; and a sensor body enclosing said detecti