This document pertains to Valmet engines, specifically the 300 Series, 400 Series, and 600 Series. These engines are associated with brands such as Sampo, Dronningborg, Laennen, and Huddig, and are commonly integrated into forestry machines, harvesters, forwarders, and potentially agricultural machinery. Valmet engines are recognized for their robust engineering, reliability, and suitability for demanding operational environments, often characterized by strong low-end torque essential for heavy machinery. The engine models covered include various configurations such as the Valmet 310 BL, 411 BL, 411 CL, 611 DSL, and others, featuring direct injection diesel architecture, liquid cooling, and likely 3, 4, or 6-cylinder configurations. Turbocharged variants are also indicated by specific model designations. This comprehensive Spare Parts Catalogue, available in Swedish, Finnish, and English, provides essential information for the maintenance and identification of Valmet engines. It covers critical areas including engine oil type and capacity, filter requirements, and fuel system specifications. The manual is designed to assist owners, mechanics, and technicians in accurately identifying and sourcing replacement parts, ensuring the continued optimal performance and longevity of the Valmet engines across their diverse applications. With 876 pages of detailed content, this resource is an indispensable tool for managing Valmet engine upkeep.