Cummins 6BTA / QSB 5.9 Marine Heat Exchanger Core Assembly - Used

Used marine heat exchanger core assembly, shell-and-tube style with bronze tube bundle, side coolant/raw-water hose ports, and zinc anode boss. Application: believed to fit Cummins 6BTA / QSB 5.9 marine diesel or similar Sen-Dure-supplied engine. Condition: used take-off with surface oxidation, verdigris on bronze fittings, and one end cap removed — recommended to be pressure tested, cleaned, and re-tubed before installation. 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.