Internal combustion engine

FIG. 1 is a front, left side perspective view of an internal combustion engine according to our new design;

FIG. 2 is a front, right side perspective view thereof;

FIG. 3 is a rear, left side perspective view thereof;

FIG. 4 is a rear, right side perspective view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a right side elevational view thereof;

FIG. 9 is a rear elevational view thereof; and,

FIG. 10 is a bottom view thereof.

The broken lines in the figures are for illustrative purposes only and form no part of the claimed design.