Marine propulsion internal combustion engine

摘要

An internal combustion engine comprising an engine block, a crankshaft rotatably supported by the block and including an axis, a first portion which is cylindrical in shape, which is concentric with the axis, and which has a uniform radius, and a second portion extending from the first portion in concentric relation thereto and having a radius less than the radius of the first portion to define a radially extending shoulder on the first portion, a flywheel including a surface engaging the shoulder, and a central aperture receiving the second portion of the crankshaft and having a radius less then the radius of the first portion, and bolts extending through the flywheel and into the first portion of the crankshaft for securing the flywheel to the crankshaft.