This manual covers the YANMAR 12LAK(M)-STE2 and 16LAK-STE1 engines, designed for marine or generator applications. These internal combustion engines are built with YANMAR's renowned engineering quality, ensuring reliability and efficient performance for demanding operational environments. Their robust construction and advanced design make them a dependable choice for power generation and marine propulsion systems. This comprehensive Full Service & Repair Workshop Manual provides detailed instructions for all repairs, servicing, and troubleshooting procedures for the specified YANMAR engine models. It includes hundreds of pages with detailed photos, diagrams, and exploded views to guide owners, mechanics, and technicians through every maintenance task. The step-by-step instructions ensure that all work is performed correctly and efficiently, helping to maintain the optimal performance and longevity of your engine.