Detroit Diesel 8-Plate Engine Oil Cooler Core - Used

Detroit Diesel-style engine oil cooler core (oil-to-coolant plate-type heat exchanger), 8-plate stack on an oval 10-bolt mounting flange with two threaded ports and a cast IN/OUT flow arrow. The flange carries the cast/stamped number 8534719 and a previous owner's handwritten "Detroit / PT. NO. 8534719" marking; that number requires verification against the Detroit Diesel catalog and is not published here as a confirmed orderable part number. Application: not verified. May fit Detroit Diesel two-cycle engine families; sold by photographs, identifiers, and dimensions only. Condition: used take-off, untested by us. Surface rust and scale on the flange, oxidation/discoloration on the plate stack, no visible cracks or crushed plates, appears complete. A prior handwritten "tested good" note is on the part but is an unverified third-party claim — we recommend a shop pressure test and a new gasket before installation. The unit will be drained and ports capped before shipping. Quote is subject to final fitment confirmation by engine/transmission serial number, part number, photos, and supplier availability. 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.