Internal combustion engine installed in engine compartment

摘要

An outboard motor S is provided with an internal combustion engine E installed in an engine compartment 15 which is defined by an engine cover C. The engine E has an intake air inlet Pi of an intake system of the engine. The intake air inlet Pi is formed by an air intake duct 54. The intake duct 54 communicates with an air intake space 42 located outside the engine compartment 15. The engine cover C includes an upper cover 14 formed with a receiving ring 14b which is fitted on the air intake duct 54. The receiving ring 14b and the intake duct 54 form an overlapping part W in which the receiving ring 14b and the intake duct 54 overlap each other in the direction F of flow of combustion air. The overlapping part W has a sealing member 55 therein which forms a seal between the air intake space 42 and the interior space of the engine compartment 15. The thus formed sealing structure does not require high dimensional precision to form a required sealing property between the engine cover and the air inlet part of the engine intake system. The sealing structure is not susceptible to influence of engine vibrations.