This manual covers the Mack M-E7 Marine engine, a robust and reliable marine propulsion unit designed for demanding maritime applications. Engineered for exceptional performance and durability, the M-E7 Marine engine is a testament to Mack's commitment to quality, providing efficient power and dependable operation for a wide range of marine vessels. Its advanced design and construction ensure optimal functionality and longevity in challenging marine environments. The Mack M-E7 Marine Service Repair Manual provides comprehensive guidance for the maintenance, troubleshooting, and repair of your engine. This English-language manual details essential procedures including lubrication system maintenance, fuel filter replacement, cooling system service, drive belt adjustments, and exhaust aftertreatment system care. It also includes in-depth repair instructions for engine disassembly, cylinder block reconditioning, cylinder head overhaul, engine reassembly, oil pump replacement, unit injector cleaning, and final engine setup. Technical specifications, diagrams, special tools, and recommended materials are also included to assist owners, mechanics, and technicians in keeping the engine in peak operating condition.