The Komatsu 4D98 Engine is a robust diesel engine designed for a variety of demanding applications. This water-cooled, direct injection engine features a 3.3-liter displacement, a 4-cylinder configuration, and a compression ignition system. Its engineering prioritizes reliability and performance, with power output typically ranging between 60-80 horsepower depending on the specific application. The engine's bore is 98 mm and its stroke is 110 mm, contributing to its efficient operation. This Workshop Service Repair Manual provides comprehensive guidance for the Komatsu 4D98 Engine. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for proper upkeep and repair. Owners, technicians, and mechanics will find the information within this manual, presented in English, invaluable for ensuring the longevity and optimal performance of their equipment. The manual details lubrication requirements, coolant capacity, and service intervals, among other vital operational data.