PURPOSE: To prevent the dissolution of recycled exhaust air in lubricating oil located on the surface of a liner slide face by providing an exhaust nozzle in a feed passage in a cylinder head to inject recycled exhaust gas in the direction of a fuel injection nozzle in the cylinder head before the feed valve is closed.

CONSTITUTION: An exhaust nozzle 34 is installed in a feed passage 30 in a cylinder head. The exhaust nozzle 34, which is installed to serve for injection in such a direction that a fuel injection nozzle 33 is installed when a feed valve 32 is open, is adapted to open and close a control valve 41 in accordance with an output signal 42 in inputting a rotating angle signal 43 from a crank shaft 22 to a controller 40 so that exhaust gas can be injected from the exhaust nozzle 34 when the feed valve 32 is open. In this way, recycled exhaust gas is free from dissolution in lubricating oil located on the surface of a liner slide face 21, and portions where lubricating oil is supplied, including the liner slide face 21, is free from corrosion and wear.