This comprehensive service and repair manual provides detailed instructions for maintaining, servicing, diagnosing, and repairing Yanmar Marine Diesel Engines from the GM series, covering models 1GM(10L), 2GM(F)(L), 3GM(D)(F)(L), and 3HM(F)(L). The manual includes step-by-step instructions with highly detailed exploded pictures and diagrams, guiding you through each repair procedure accurately and efficiently.

The manual offers extensive coverage encompassing general information, basic engine components, fuel system, governor, intake and exhaust systems, lubrication system, direct sea-water cooling system, fresh water cooling system, modifications to the cooling system, reduction and reversing gear, marine gear models KM2P, KMP3, and KM3V for engine models 1GM10, 2GM20(F), and 3GM30(F), the V-Drive gear model KM3V, remote control system, electrical system, operating instructions, and disassembly and reassembly procedures for both direct sea-water cooling and fresh water cooling engines.

This manual is an indispensable resource for boat owners, mechanics, and anyone seeking in-depth technical information for Yanmar GM series marine diesel engines.

The Yanmar GM series of marine diesel engines are known for their reliability, efficiency, and compact size, making them a popular choice for a wide range of boats. The series encompasses several models, each with its own unique specifications and applications. The 1GM(10L) is a single-cylinder engine, while the 2GM(F)(L) features two cylinders. The 3GM series expands upon this with three cylinders, offering both naturally aspirated (D) and turbocharged (F) versions, as well as a long shaft (L) option for deeper installations. The 3HM(F)(L) models add high output power to the 3GM series, further extending the applications of these versatile engines.

The Yanmar GM series engines are designed for both fresh and saltwater environments, featuring robust construction with corrosion-resistant materials. They boast advanced features such as a closed-circuit cooling system, ensuring optimal performance even in challenging conditions. The compact design allows for easy installation in various boat types, while the low noise and vibration levels provide a comfortable experience for the boat owner. These engines are well-known for their fuel efficiency, contributing to reduced operating costs and a lighter environmental footprint. Whether cruising leisurely or navigating challenging waters, the Yanmar GM series delivers dependable power and peace of mind, making them a preferred choice for both experienced boaters and those starting their journey on the water.