This comprehensive service and repair manual is your ultimate guide to maintaining and repairing your Yanmar marine diesel engines. It encompasses the 3JH2-(B)E, 3JH2-T(B)E, 3JH25A, and 3JH30A models, covering every aspect of their operation. Packed with detailed photos and diagrams, this manual presents step-by-step instructions for a wide range of procedures, ensuring you have the knowledge and confidence to tackle any repair or maintenance task. From basic servicing to complex troubleshooting, this manual provides the same in-depth information used by professional mechanics and technicians. It is designed to be your go-to resource, empowering you to keep your marine engine running smoothly and reliably.

The Yanmar 3JH2 series marine diesel engines are renowned for their compact size, robust construction, and reliable performance, making them a popular choice for a wide range of marine applications. These engines are designed for both sailboats and powerboats, offering a power range from 17 to 27 horsepower. The 3JH2-(B)E, 3JH2-T(B)E, 3JH25A, and 3JH30A models all share a common core design but differ in their specific features and power outputs. The 3JH2-(B)E and 3JH2-T(B)E models are air-cooled and feature a single-cylinder configuration, making them particularly suitable for small sailboats. The 3JH25A and 3JH30A models, on the other hand, are water-cooled and feature a two-cylinder configuration, offering increased power and torque for larger vessels.

All models in the 3JH2 series are known for their low fuel consumption, quiet operation, and ease of maintenance. The engines are equipped with a range of features designed to enhance reliability, including a robust crankshaft, a high-pressure fuel injection system, and a sophisticated cooling system. The compact size of the 3JH2 engines allows for easy installation in a variety of vessels, while the lightweight design minimizes weight penalties. The 3JH2 series is also known for its long service life, with many engines still in operation after decades of use. The comprehensive service and repair manual accompanying these engines provides detailed instructions and diagrams for all aspects of maintenance and repair, ensuring that owners can keep their Yanmar engines running smoothly and efficiently for years to come.