90-814676 Service Manual – Mariner 40HP 4-Cyl

The Mariner 40HP Service Manual (part number 90-814676) is the official factory reference for 4-cylinder Mercury and Mariner outboards. Printed in the USA by Brunswick Corporation, this manual provides accurate, model-specific instructions for servicing, repairing, and maintaining your engine.

Inside, you will find clearly labeled diagrams, precise wiring schematics, torque specifications, fuel system data, and electrical testing procedures. Each section is arranged for quick navigation, allowing you to locate critical service information without wasted time. The step-by-step instructions ensure you can follow along easily, whether you are performing a routine tune-up or tackling a major overhaul.

Additionally, this manual covers power trim system disassembly, ignition adjustments, cooling system maintenance, and detailed troubleshooting charts. It offers exact measurements, resistance readings, and illustrated component breakdowns to help you diagnose and solve problems efficiently.

Because it was written by the same engineers who designed the engine, the Mariner 40HP Service Manual contains only factory-approved specifications. This ensures your repairs meet original standards, maintaining optimal performance and extending engine life.

Unlike generic guides, this manual is tailored to your model’s year and configuration. Its durable print format is workshop-ready, designed to withstand grease, oil, and daily use. Whether you are a professional marine mechanic or an owner who prefers to maintain your own outboard, this guide provides the clarity and precision you need for reliable results.

Arizona Outboard Dismantlers offers genuine manuals like this to help you protect your investment and keep your boating season trouble-free.