This comprehensive service repair manual is your essential guide to maintaining and repairing your MERCURY MARINER 250 EFI outboard motor with serial numbers starting from 0T409000 and above. Inside, you'll find detailed instructions and diagrams covering all aspects of your engine, from routine maintenance procedures like oil changes and filter replacements to more complex repairs involving the fuel injection system, electrical components, and mechanical parts. The manual is designed to help both experienced mechanics and DIY enthusiasts troubleshoot issues, understand the inner workings of your engine, and perform repairs effectively. Whether you need to address a specific problem or simply want to keep your engine running smoothly, this service manual provides the essential information and guidance you need.

The MERCURY Mariner 250 EFI, with serial numbers 0T409000 and above, is a powerful and reliable outboard engine designed for serious boating enthusiasts. This model boasts a 250-horsepower output, thanks to its advanced 2.8L, 4-cylinder, 4-stroke engine. Equipped with Mercury's fuel-injected (EFI) system, the Mariner 250 EFI delivers impressive performance and fuel efficiency, ensuring a smooth and responsive ride. The EFI system, coupled with Mercury's precision engineering, offers consistent starting, even in challenging conditions, while reducing emissions and enhancing fuel consumption. The engine is also equipped with a robust and reliable cooling system, ensuring optimal operating temperatures and extending its lifespan.

This outboard engine is a testament to Mercury's commitment to innovation and quality. It is designed to withstand the rigors of demanding aquatic conditions, thanks to its durable construction and corrosion-resistant materials. The Mariner 250 EFI is equipped with a range of features designed to enhance user experience, including a user-friendly control panel, remote steering, and a tilt steering system. Additionally, it boasts a robust and reliable electric start system, making starting the engine effortless. The Mariner 250 EFI is not only powerful and efficient but also versatile, suitable for a range of boat types, from fishing boats to recreational watercraft. This model is a perfect choice for boaters seeking a powerful, reliable, and feature-rich outboard engine capable of delivering exceptional performance and years of dependable service.