Question 1594 Deck General

The correct answer is D) All of the above. On small passenger vessels, the entire water-cooled gasoline or diesel engine, including the exhaust manifold, engine head, and engine block, must be water-jacketed and cooled. This is a requirement specified in the regulations governing the construction and equipment of small passenger vessels under the U.S. Coast Guard's jurisdiction. Proper water-cooling of the entire engine system helps maintain optimal engine performance, prevents overheating, and enhances the overall safety of the vessel. The other answer options are incorrect because they do not encompass the full scope of the engine components that must be water-cooled on small passenger vessels as per the applicable regulations.