The Mercury Mariner 140 HP Jet Outboard, produced from 1992 to 2000 as part of the Early Jet Series, represents a robust V6 engine designed for reliable performance. This water-cooled, carbureted outboard features a 153 cubic inch (2.5 Liter) displacement, delivering 140 horsepower and operating within a maximum RPM range of 4500-5500. Its jet drive transmission offers a unique propulsion system, complemented by standard safety features like an ignition cutoff switch. Available with standard or long shaft lengths, this engine is engineered for durability and efficiency in various marine applications. This workshop service manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner 140 HP Jet Outboard. It covers essential procedures, technical specifications, and troubleshooting steps necessary to keep your engine operating at peak performance. Within these pages, you will find detailed information on lubrication, including recommended oil types for the powerhead and gearcase, as well as intervals for critical component replacements such as spark plugs and water pump impellers. This manual is an indispensable resource for owners and technicians alike, ensuring the longevity and optimal function of the outboard.