40101-ZZ5-M00ZB Eng *NHB14M* Case - Overview. The 40101-ZZ5-M00ZB Eng *NHB14M* Case is a crucial component of Honda marine engine systems. This lower engine case serves as the protective housing for vital engine parts and supports the structural integrity of the engine. Engineered meticulously to meet factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM lower engine case designed specifically for H