OB3644 Service Manual – Chrysler 35HP, 45HP & 50HP

The OB3644 Service Manual is the official factory OEM guide for Chrysler’s 1981 outboard motors rated 35HP, 45HP, and 50HP — covering models 353H1N, 456H1M / 456B1M / 457H1M / 457B1M, and 507B1A / 507H1A. Published in August 1980, this OB3644 manual includes about 214 pages of detailed specifications, factory diagrams, exploded views, and step-by-step repair and maintenance procedures.

Inside this OB3644 Service Manual you’ll find sections on:

• General Service Information & Maintenance Schedules

• Fuel System & Components

• Ignition System

• Power Head / Upper Engine Maintenance

• Lower Unit & Gearcase Service

• Starter / Charging / Electrical Systems

• Remote Control & Steering Handle Assembly

• Troubleshooting Guides & Special Tools

It provides factory torque values, performance specifications, parts diagrams—perfect for marine mechanics, boat restorers, or owners of Chrysler outboards wanting authentic detail and repair confidence. Shop at Arizona Outboard Dismantlers for the parts you need to stay on the water.
Issued by Chrysler Marine (West Bend), the OB3644 manual adheres to the original engineering and quality standards. It is trusted by professionals and enthusiasts who demand accurate OEM documentation.