This comprehensive Yanmar 1GM10, 2GM20, 3GM30, and 3HM35 service and repair manual is a valuable resource for anyone looking to perform maintenance, repairs, or troubleshooting on these popular marine engines. It provides detailed, step-by-step instructions and illustrations, making it easy to understand and follow even for novice mechanics.

The manual covers a wide range of topics, including basic engine operation, fuel system, governor, intake and exhaust systems, lubrication system, direct sea water and freshwater cooling systems, reduction and reversing gear, remote control system, electrical system, and operating instructions. You'll also find detailed information on disassembly and reassembly procedures.

Whether you're a professional mechanic or a DIY enthusiast, this manual is an essential tool for keeping your Yanmar marine engine running smoothly. It provides all the information you need to diagnose and repair any problems, ensuring your engine performs at its best.