40101-ZW5-405ZA Eng *NH282MU* Case - Overview. The 40101-ZW5-405ZA Eng *NH282MU* Case is a critical component within Honda marine engine systems. This lower engine case supports the engine's structural integrity and protects essential internal mechanisms. As an OEM part designed to factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This engine case serves as a protective housing for the lower section of the