This manual covers the YANMAR HA(L) Series diesel engines, specifically the 4HAL Industrial, 6HAL Industrial, 6HAL-T Industrial, 6HAE Marine, and 6HA-HTE Marine models. These robust engines are designed for demanding applications in both marine and industrial environments. The series includes both naturally aspirated and turbocharged variants, offering versatile power solutions. YANMAR engines are recognized for their engineering quality and reliability, making them a trusted choice for professional use. This comprehensive Factory Service, Repair, and Workshop Manual provides detailed guidance for the maintenance and repair of your YANMAR HA(L) Series engine. It covers essential areas including engine specifications, lubrication, cooling systems, fuel systems, electrical systems, and troubleshooting. Procedures for cylinder head and engine proper maintenance, emergency stop systems, and engine installation are also included. For marine applications, a dedicated section on the marine gear is provided. This manual is an indispensable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of their YANMAR engines.