Mercury & Mariner 4-Cylinder 2-Stroke Outboard Gearcase Parts Diagrams

This dedicated page provides thorough gearcase diagrams for Mercury and Mariner 4‑cylinder outboard engines. Whether you're rebuilding or repairing, our visuals offer a clear breakdown of each component, making identification and ordering a breeze. At OBParts, we take pride in our extensive inventory coverage—our warehouse in Scottsville, KY, stocks both new and used outboard components, backed by decades of family-run expertise. With categories spanning 2-, 3-, 4-, and 6-cylinder gearcases, rebuild kits, and internal bearings, this page is part of our comprehensive resource hub for marine engine parts.