This Yanmar Marine Diesel engine, model 6ly2a-stp, is a reliable and powerful machine for your boat. It features a coolant tank with a missing cap, which can be easily replaced. The engine is compatible with various boat parts and accessories, making it a versatile choice for any boater in need of a reliable inboard engine. The brand Yanmar is known for its quality and durability, ensuring that this engine will serve you well for years to come.