The ornamental design for an enginerockercover, as shown and described herein.
FIG. 1 is a perspective view of an engine rocker cover in accordance with the present invention.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a rear elevational view thereof.
The broken lines in the drawing views are included for the purpose of illustrating portions of the engine rocker cover that form no part of the claimed design.