41100-ZY3-E13ZC Gear Nh565 Case - Overview. The 41100-ZY3-E13ZC Gear Nh565 Case is a crucial component within Honda marine engine systems. This gear case assembly supports the marine propulsion system by housing and protecting the gears that transfer power within the lower unit. It plays a vital role in maintaining the transmission's reliability and efficiency. Manufactured to OEM standards, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key