Caterpillar 6I-4579 Idler Gear for 3406E / C15 - Used

Used Caterpillar gear stamped 6I-4579, commonly listed as an idler/timing gear for CAT 3406E and C15 diesel engines. A CAT box shown in the photos is labeled 6I-3625 GEAR AS — the box number and the number on the gear do not match, so please confirm which part you need before purchase. Condition: used take-off, untested, surface rust on one face, no visibly broken teeth. Application: Caterpillar 3406E / C15 (not verified on this specific unit). Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.