This manual covers the OMC Stern Drive 400 Series. Designed for marine applications, this series represents a robust and reliable component for boat propulsion. Its engineering focuses on durability and efficient power transfer, making it a trusted choice for a variety of watercraft. The 400 Series is built to withstand the demanding conditions of marine environments, ensuring consistent performance for recreational and professional use. The purpose of this manual is to provide comprehensive information regarding the parts associated with the OMC Stern Drive 400 Series. It serves as an essential resource for identifying, ordering, and understanding the various components that comprise this drive system. By detailing each part, this manual assists owners, service technicians, and parts suppliers in maintaining the operational integrity and longevity of the OMC Stern Drive 400 Series.