23170-ZVT-B10 Mount Case - Overview. The 23170-ZVT-B10 Mount Case is a critical component in Honda marine engine systems. It serves as a robust mounting housing for vital engine internal parts, ensuring they remain securely in place during operation. Designed to support and protect essential mechanical components, the mount case plays a pivotal role in maintaining the structural integrity and reliable functioning of the marine engine. Engineered to fit precisely according to Honda's factory spec