This manual covers Yanmar 3TNV88-BKMS, 4TNV88-BKMS, and 4TNV88-BDMS engines, designed for reliable performance in demanding applications. These engines are integral to various equipment, including Gehl 3640/3840/4240 and Mustang 2026/2041/2044/2054 skid-steer loaders. The publication, form number 917329 revision A, dated June 2008, provides an illustrated master parts list in English, essential for identifying replacement components. The purpose of this manual is to facilitate the identification of parts for the specified Yanmar engines. It includes highly detailed exploded views and diagrams for numerous engine systems, such as the cylinder block, cylinder head, fuel injection system, lubrication, and cooling systems, among others. A numerical index is also provided for quick reference. This document is intended for owners, mechanics, and technicians to ensure proper maintenance and part replacement for optimal engine operation.