This comprehensive service manual provides detailed instructions and specifications for servicing and repairing MerCruiser MCM 120-260 stern drive units. Designed as a "Service Guide" for mechanics and dealers, this manual offers in-depth information on disassembling, assembling, inspecting, and adjusting these units to ensure optimal performance. The manual covers a wide range of models, including MCM 120/140/165/470/485/898/228/260 with serial numbers ranging from 4891650 to 6216686, as well as MC 120-260 stern drive units with various gear ratios and serial numbers.

The manual is organized into comprehensive sections. Section 1 provides general information about the unit, followed by Section 2 which covers troubleshooting procedures. Section 3 delves into the specifics of the drive unit, with detailed information on both the drive shaft housing assembly and gear housing assembly. Section 4 focuses on the transom plate assembly, while Section 5 covers power trim and Section 6 addresses power steering. Finally, Section 7 contains important service bulletins to ensure you have the latest updates. Every procedure is clearly explained and supplemented with detailed photos and illustrations, making it easy to follow and understand. This manual is an essential resource for anyone looking to maintain and repair their MerCruiser MCM 120-260 stern drive unit.

The MerCruiser MCM 120-260 Stern Drive Units are a range of powerful and reliable marine propulsion systems designed for a variety of boat applications. These units combine the benefits of an inboard engine with the ease of use and maneuverability of an outboard motor, offering a unique driving experience. The MCM 120-260 series encompasses a spectrum of engine options, ranging from the compact and fuel-efficient 120 hp to the robust and powerful 260 hp, catering to diverse boating needs. Each model features a robust and durable design, incorporating high-quality materials and advanced engineering to ensure long-lasting performance and reliability. The MerCruiser MCM 120-260 Stern Drive Units are renowned for their smooth operation, quiet running, and impressive fuel efficiency, making them an ideal choice for pleasure boating, fishing, and other recreational applications.

Beyond their core functionality, the MerCruiser MCM 120-260 Stern Drive Units offer a range of features designed to enhance user experience and simplify maintenance. They incorporate user-friendly controls, allowing for effortless maneuvering and precise control, while their accessible design facilitates routine maintenance and repairs. The units are further enhanced by a comprehensive suite of accessories, including optional power steering, hydraulic trim tabs, and various electronic controls, allowing boat owners to tailor their systems to their specific needs. The MerCruiser Service Repair Manual #04-MCM 120-260 Stern Drive Units serves as a crucial resource for owners, technicians, and enthusiasts, providing detailed information and step-by-step instructions for maintenance, repair, and troubleshooting. This comprehensive manual covers all aspects of the system, from routine maintenance tasks to in-depth troubleshooting procedures, ensuring optimal performance and longevity of the MerCruiser MCM 120-260 Stern Drive Units.