Marine Diesel Water-Cooled Exhaust Manifold - Inline 6-Cylinder - Used, Untested

Used water-cooled marine exhaust manifold for an inline 6-cylinder diesel engine. Six exhaust runner ports, integrated water jacket, and end coolant fittings. Casting number 51452011 visible on the side of the housing (casting number only — not a confirmed OEM service part number). Application not verified from photos; visual family is consistent with small-bore inline-6 marine diesels such as Steyr Motors, MAN, Yanmar, or Volvo Penta — buyer must confirm before purchase. Surface rust, paint scaling, and interior soot present; sold untested. Any residual coolant will be 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.