This manual covers the YANMAR 12LAK M STE2 and 16LAK STE1 engines, designed for robust performance and reliability in various applications. These engines represent YANMAR's commitment to engineering excellence, providing dependable power solutions for demanding tasks. This comprehensive workshop repair manual is intended for service, repair, and maintenance of these specific engine models, ensuring they operate at peak efficiency. The purpose of this English-language service and repair manual is to provide detailed guidance for all aspects of maintenance, servicing, and repair. It includes step-by-step instructions, wiring diagrams, and comprehensive coverage of all servicing and repair jobs, enabling owners and technicians to perform maintenance independently. By following the procedures outlined, users can ensure the longevity and optimal performance of their YANMAR engines while potentially saving on repair costs.