This comprehensive service repair manual provides detailed instructions and diagrams to help you service and repair your Mercury Mariner 30 and 40 2-cylinder outboard motors. It covers a wide range of topics, including specifications, maintenance procedures, general information, outboard installation, electrical systems, ignition systems, charging and starting systems, timing, synchronizing and adjusting, wiring diagrams, fuel system components like fuel pumps and carburetors, oil injection systems, powerhead components, mid-section components, clamp/swivel brackets and drive shaft housing, power trim systems, manual tilt systems, lower unit components, attachment and control linkages, throttle/shift linkages, tiller handles, and manual starters. This manual covers Mercury Outboard 30 / 30 Marathon / 30 Sea Pro and 40 / 40 Marathon / 40 Sea Pro models with serial numbers of 0G044027 and above for the United States and 09855139 and above for Belgium. This manual is a valuable resource for anyone looking to maintain and repair their Mercury Mariner outboard motors.

The Mercury Mariner 30 and 40 horsepower 2-cylinder outboard motors are renowned for their reliability, fuel efficiency, and ease of maintenance. These engines, designed for smaller recreational boats, deliver dependable power and smooth operation. The Mariner 30 and 40 are part of a long-standing legacy of boating excellence, offering a blend of affordability and performance. Their compact design and lightweight construction make them ideal for a wide range of applications, from fishing and waterskiing to leisurely cruising. With their robust construction and simple design, these motors are known for their longevity, providing years of reliable service to boat owners. The Mercury Mariner 30 and 40 outboard motors are powered by a 2-cylinder, 4-stroke engine, delivering smooth and quiet operation. The motors feature an electric start option for effortless ignition, while the manual start system ensures reliable operation even in situations where electricity is unavailable. These outboards boast a high torque-to-weight ratio, ensuring efficient acceleration and responsive handling. The Mercury Mariner 30 and 40 are equipped with a variety of features designed for ease of use and maintenance, including a conveniently located oil dipstick, easy-to-access filters, and simple controls for convenient operation. These motors are also known for their fuel efficiency, minimizing operating costs and maximizing time spent enjoying the water. The Mercury Mariner 30 and 40 outboard motors combine reliable performance, ease of use, and affordability, making them an excellent choice for recreational boaters seeking a dependable and enjoyable experience on the water.