Caterpillar Marine Heat Exchanger End Cover / Raw-Water Bonnet (Casting 103-5822) - Used

Caterpillar marine heat exchanger end cover / raw-water bonnet, cast in CAT yellow with the casting number 103-5822 on the crown. Features a round bolt-on flange, an internal two-pass divider rib, twin hose necks exiting the same side, and two threaded brass bosses for pencil zinc anodes — typical of a seawater-side cooler cover on Caterpillar marine engines. Application: Caterpillar marine cooling system components; the specific engine arrangement has not been verified. Reverse-image hints point toward the CAT marine 3208 / 3116 / 3126 family, but that is unconfirmed. Condition: Used take-off, untested. Chipped paint, light surface rust on the flange and necks, and raw-water staining inside. No visible cracks in the photos, but the casting has not been pressure-tested or dye-checked. Drained and ports capped before shipping. 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. Quote is subject to final fitment confirmation by engine/transmission serial number, part number, photos, and supplier availability.