MISASSEMBLY PREVENTION STRUCTURES FOR INTERNAL COMBUSTION ENGINE

The present invention provides misassembly prevention structures for internal combustion engines such that misassembly of components for different models of internal combustion engines is prevented. The misassembly prevention structures for internal combustion engines are configured such that: one component (2) among components of a first internal combustion engine (1) that would mutually contacteach other is formed such that a portion of a peripheral wall (2A) having a mating surface (2f) as an end face extends outward as an interfering part (2P) that vertically protrudes beyond the mating surface (2f), whereas the portion of the other component (3) that would face the interfering part (2P) of the one component (2) does not have an interference-receiving part that would abut therewith; meanwhile the other component (103) among the components of a second internal combustion engine (101), different from the first internal combustion engine (1), that would mutually contact each other isformed so that the portio