This comprehensive service and repair manual provides detailed instructions for maintaining and repairing 1983-1990 Mercury Mercruiser #6 Sterndrive Units, including the Alpha One and Alpha One SS models. Whether you're a seasoned mechanic or a first-time boat owner, this manual offers the guidance you need to perform procedures correctly. The manual covers a wide range of topics, including: * **Transom Assemblies:** Detailed information on various models including MC 120R, 140B, 185R, 488R, 898R, 228R, 260R, 120MR, 140MR, 170MR, 185MR, 190MR, 200MR, 230MR, 260MR, 300 Tempest MR, and Alpha One/Alpha One SS. * **Sterndrive Units:** Instructions on servicing and repairing sterndrive units, covering models from MC 120R to 260R and MC 120MR to 300 Tempest MR, including detailed specifications for different gear ratios. * **Removal, Installation, and Adjustments:** Comprehensive guidelines for removing, installing, and adjusting components for all models. * **Sterndrive Unit Components:** Detailed information on servicing the drive shaft housing, gear housing for MR, Alpha One, Alpha One SS, I-R, and Alpha One counter-rotation models. * **Transom Assembly:** Step-by-step procedures for servicing transom assemblies, both minor and major disassembly. * **Power Trim:** Instructions on servicing Oildyne and Prestolite power trim pumps, trim cylinders, dual power trim control, and Auto Trim II. * **Steering Systems:** Detailed information on maintaining and repairing both power and manual steering systems. * **Corrosion Protection:** Guidance for protecting your sterndrive unit from corrosion. This user-friendly manual is written in clear and concise language, making it easy to understand and follow. By performing regular preventative maintenance, you can help to prevent premature failure and save money on unnecessary repairs.

The 1983-1990 Mercury MerCruiser #6 Sterndrive Units R MR Alpha One Alpha One SS Workshop Service Repair Manual, designed specifically for Sea Ray marine vessels, is a comprehensive guide for maintaining and repairing the iconic MerCruiser Alpha One and Alpha One SS sterndrive units. These sterndrive systems, known for their reliability and performance, powered a wide range of Sea Ray boats during this era. The manual provides an in-depth understanding of the intricate workings of these sterndrive units, encompassing the entire assembly from the transom to the propeller. It covers a wide range of topics, including engine and transmission components, steering and control mechanisms, drive shafts and propellers, as well as the associated hydraulic and electrical systems. Detailed technical diagrams and step-by-step instructions guide users through various repair and maintenance procedures. This manual is an invaluable resource for boat owners, mechanics, and enthusiasts seeking to ensure the smooth operation and longevity of their Sea Ray vessels equipped with MerCruiser Alpha One or Alpha One SS sterndrive units. It empowers users to tackle a wide range of maintenance and repair tasks, from routine servicing like oil changes and fluid checks to more complex procedures like engine rebuilds and sterndrive component replacements. With its comprehensive coverage of components, systems, and procedures, this manual serves as a vital companion for anyone seeking to proficiently maintain and repair these popular and durable sterndrive systems.