The Lister Petter AC-AD is a robust and reliable single-cylinder, vertical, air-cooled, 4-stroke diesel engine designed for demanding industrial and marine applications. Available in AC1 and AD1 variants, these engines offer dependable power outputs ranging from 4.5 to 5.4 BHP at 3000 RPM, with a displacement of 0.475 litres. Engineered for durability and efficiency, the AC-AD series features a splash lubrication system and a wet exhaust system for quiet operation, making it a suitable choice for various operational environments. The engine supports manual and optional electric starting methods, ensuring versatility in deployment.

This Operator's Handbook provides comprehensive guidance for the Lister Petter AC-AD engine. It covers essential operational details, maintenance schedules, and technical specifications necessary for optimal performance and longevity. Key areas addressed include recommended service intervals, oil capacity and type, air cleaner maintenance, and fuel filter replacement procedures. The manual is written in English and is intended to assist owners, operators, and technicians in understanding the engine's capabilities and performing routine upkeep and troubleshooting, thereby ensuring the continued reliability of the engine in its intended industrial and marine applications.