Provided is a check valve structure capable of preventing soot accumulation in a check valve arranged in a pre-combustion chamber (4) due to incomplete combustion of fuel gas and preventing malfunction the check valve (6) for a gas engine having an pre-com...

Provided is a gas engine having a spark plug provided with a pre-combustion chamber and a check valve, the gas engine, in which the check valve is arranged in the neighborhood of the pre-combustion chamber, being capable of preventing adhesion of a solenoi...

A cooling water pipe (1) is deformed so as to have outlet openings (4, 5, 6) respectively placed in a position around a fuel injection nozzle (2) and in a position between ports (3), and the cooling water pipe 1 is inserted to be placed inside the cylinder...