This document provides comprehensive service information for the 4LH-TE, HTE, DTE, and STE series marine diesel engines. Engineered for reliable marine propulsion, these internal combustion engines are designed to meet the demanding requirements of maritime applications. Engines are recognized for their robust construction and efficient performance, ensuring dependable operation in various marine environments. This Factory Service Repair Workshop Manual is an indispensable resource for maintaining and repairing your marine diesel engine. It covers all repairs, servicing, and troubleshooting procedures with step-by-step instructions, detailed photos, and exploded diagrams. Whether you are an owner, mechanic, or technician, this manual will guide you through every aspect of engine care, ensuring optimal performance and longevity.