This comprehensive service and repair manual provides detailed instructions and diagrams for servicing and repairing Mercury Mariner 150, 175, and 200 EFI outboard motors, covering models starting from the 2002 model year with serial numbers 0T409000 and later. The manual encompasses a wide range of topics essential for both experienced mechanics and DIY enthusiasts. It features detailed specifications, maintenance schedules, and general information to help you understand the intricacies of your outboard motor. The manual covers installation procedures for the outboard, providing a step-by-step guide to ensure proper mounting and integration. It delves into the electrical system, including the ignition, charging and starting systems, and wiring diagrams, allowing you to troubleshoot and repair electrical issues. A dedicated section on timing, synchronizing, and adjusting ensures optimal performance and efficiency. The manual further explores the fuel system, providing comprehensive information on fuel pumps, fuel injection systems, oil injection, and emissions control. Extensive coverage of the powerhead, cooling system, mid-section, clamp/swivel brackets, drive shaft housing, power trim, gear housing, and attachments/control linkage enables you to diagnose and repair mechanical components accurately. Color diagrams are also included throughout the manual to enhance your understanding of the various components and their functions.

The Mercury Mariner 150 EFI, 175 EFI, and 200 EFI outboard motors are a powerful and reliable trio of engines designed to deliver exceptional performance and durability on the water. These models are part of Mercury's renowned line of four-stroke outboards, known for their smooth operation, fuel efficiency, and low noise levels. All three engines feature Mercury's proprietary electronic fuel injection (EFI) system, ensuring precise fuel delivery and optimal engine performance across a wide range of operating conditions. The EFI system also delivers a quick and reliable cold-start, making the engines ready for action in any weather. The Mariner 150 EFI, 175 EFI, and 200 EFI are available in various configurations, including long-shaft and extra-long-shaft versions, allowing for versatile installation on a wide range of boat types. The robust construction of these engines, featuring cast-iron cylinder blocks and forged crankshafts, contributes to their exceptional durability and longevity. These engines are designed to withstand the harsh conditions of saltwater environments and are built to last for years of reliable service. With their high power output and fuel efficiency, these Mariner outboards are ideal for a variety of boating activities, from casual fishing trips and leisurely cruising to high-performance watersports and demanding offshore adventures. Whether you're looking for a reliable and dependable engine for your fishing boat, a powerful motor for your sport boat, or a fuel-efficient option for your cruising vessel, the Mercury Mariner 150 EFI, 175 EFI, and 200 EFI outboard motors offer a compelling package of performance, durability, and ease of use.