Patent ID: 8522743

Claim:
A multi-cylinder internal combustion engine wherein a communicating passage enables an internal space of a plurality of crank chambers corresponding to a plurality of cylinders to communicate, said communicating passage being provided to a crankcase, the multi-cylinder internal combustion engine comprising: a drain; and an opening of the drain for discharging oil being provided inside the communicating passage; wherein the oil is discharged from the opening of the drain via the drain, wherein the communicating passage is configured by fixing a cover in the shape of a bowl that encloses a communicating hole provided to the crankcase so as to make the crank chamber and the communicating passage communicate to the crankcase; the bottom of the cover is inclined downward toward the opening of the drain; and a return passage of the oil that lubricates a cylinder head and a valve system is connected to the communicating passage.