FIG. 1 is a front perspective view of a portion of an internal combustion engine showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a plan view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a left side view thereof; and,
FIG. 8 is a right side view thereof.
The broken lines in FIGS. 1-8 illustrate portions of the engine that form no part of the claimed design.