This comprehensive service repair manual is designed for Mercury Alpha One 1 sterndrives, offering detailed guidance for maintenance, troubleshooting, and repairs. The manual covers models with serial numbers OD492742 and above for the MC Alpha One Generation II, both standard and counter rotation models, across various gear ratios.

The manual provides a wealth of information, including:

**General Information:** Fundamental knowledge regarding the Mercury Alpha One 1 sterndrive system.

**Maintenance:** Essential maintenance procedures for optimal performance and longevity.

**Troubleshooting:** Step-by-step guidance to identify and resolve common issues.

**Removal and Installation:** Detailed instructions for removing and reinstalling components.

**Adjustments:** Precise procedures for adjusting critical components for proper operation.

**Driveshaft Housing:** Detailed information on the driveshaft housing and its components.

**Gear Housing:** Comprehensive coverage of both standard and counter rotation gear housings.

**Transom Assembly:** In-depth information on the transom assembly and its disassembly.

**Power Trim:** Detailed instructions and troubleshooting for the power trim system.

**Trim Cylinders, Trim Pump, and Dual Power Trim Control:** Comprehensive coverage of these components.

**Auto Trim II:** Specific instructions and troubleshooting for the Auto Trim II system.

**Steering Systems:** Detailed guidance on both power and manual steering systems.

**Corrosion Protection:** Important information on safeguarding your sterndrive against corrosion.

This manual is a valuable resource for both professional mechanics and DIY enthusiasts seeking to maintain and repair their Mercury Alpha One 1 sterndrives. It provides the same level of information as the service manuals used by authorized dealers and technicians, equipping you with the knowledge to perform repairs confidently and effectively.

The Mercury Alpha One 1 Sterndrive, produced by the renowned marine engine manufacturer Mercury MerCruiser, is a popular and reliable sterndrive system designed for a wide range of recreational boats. This model, often referred to as the "Alpha One," is known for its robust construction, smooth operation, and ease of maintenance. The Alpha One 1 is a single-engine sterndrive system that combines a powerful gasoline engine with a compact and efficient outdrive unit. This configuration allows for optimal power transfer and maneuverability, while maintaining a relatively lightweight and streamlined design. The Alpha One 1 sterndrive system is designed for both freshwater and saltwater environments, making it a versatile option for boaters of all experience levels.

The Alpha One 1 sterndrive features a durable and corrosion-resistant construction, utilizing high-quality materials such as aluminum and stainless steel. It is equipped with a reliable hydraulic steering system, a robust gearcase featuring a high-ratio reduction, and a highly efficient propeller design. The Alpha One 1 is also known for its user-friendly design, with readily accessible service points and straightforward maintenance procedures. The availability of comprehensive service manuals and a vast network of Mercury MerCruiser dealers further enhances the ease of ownership and maintenance. The Alpha One 1 is a popular choice for boat owners who value performance, reliability, and ease of operation, making it a staple in the recreational boating community.