OB3640 Service Manual – Chrysler 3.5HP & 4HP

The OB3640 Service Manual is the authoritative factory-issued guide for Chrysler outboard motors rated 3.5HP & 4HP, including models 32H1D, 32H0D (3.5HP) and 42B1H, 42H1H, 43B1H, 43H1H (4HP). Published in 8/80, this OB3640 manual spans 99 pages in a searchable PDF (~14.1 MB) and delivers full OEM specifications and illustrated instructions.

In the OB3640 Service Manual you’ll find detailed sections on:

• Introduction & General Service Information

• Fuel System (including carburetor details)

• Ignition System

• Power Head / Internal Engine Components

• Lower Unit Maintenance

• Electrical / Wiring Diagrams

• Troubleshooting & Diagnostics

Each section in this OB3640 Service Manual includes factory torque values, part diagrams, performance ranges, and step-by-step procedures—ideal for mechanics, restorers, or anyone keeping an older engine running like new. Shop at Arizona Outboard Dismantlers for the parts you need to stay on the water.
Published by Chrysler Marine (West Bend), the OB3640 Service Manual aligns with the original production standards and remains trusted by marine professionals and vintage outboard enthusiasts alike.