23170-ZY3-030ZA Mount NH8 Case - Overview. The 23170-ZY3-030ZA Mount NH8 Case is a critical mounting component designed specifically for Honda marine engine systems. This case acts as a secure housing that supports the engine mounting system, providing structural integrity and vibration absorption to keep the engine stable during operation. Made to fit seamlessly with other factory parts, it ensures that all components align perfectly to maintain optimal engine performance and durability in mari