Articulating Piston Diagram (Mack Trucks) - Diesel Engine Textbook Figure 7-4

This is a scanned page from a diesel engine technology textbook or manual showing Figure 7-4, an exploded illustration of an articulating piston, credited as "Courtesy of Mack Trucks." The illustration depicts a two-piece articulating piston assembly: the upper crown section with compression ring grooves (three rings visible) separated from the lower skirt section, which contains the wrist pin bore. Directional "FRONT" markings are stamped on the crown, inside the pin bore area, and on the skirt, indicating proper assembly orientation. The surrounding body text is mostly cut off at the page edges or out of focus, but visible fragments discuss piston characteristics, press fit of the piston pin assembly, thrust considerations, and piston diameter regions. A reader can learn from this page what an articulating (two-piece) diesel piston looks like, how its crown and skirt separate, and that orientation marks must face the front of the engine during assembly. The page appears to be from Chapter 7 of a diesel technician training text and is generic diesel engine reference material rather than documentation specific to any single vehicle.