The utility model relates to a connecting part applied to an engine, in particular to an engine main bearing cover. The engine main bearing cover comprises a cover body and a thrust grooves which are formed in two opposite sides of the cover body and are used for mounting thrust plates and enabling the thrust plates to have the outward projection thicknesses, wherein the thrust grooves are stepped grooves; the depth of each stepped groove in the axial direction of the cover body is equal to the difference between the thickness and the outward projection thickness of each thrust plate. Meanwhile, the utility model further relates to an engine body with the engine main bearing cover. According to the technical scheme, the thrust plates are accurately mounted on the premise of not increasing the thickness of the main bearing cover and not adding an assembly tool. The engine main bearing cover is simple in structure.