This workshop service repair manual provides comprehensive guidance for the Iveco Motors C13 ENT M77 engine. Designed for service and repair, this manual details servicing operations on the installed engine, overhaul procedures, and diagnostics. It is intended to assist users in maintaining and repairing this specific engine model, highlighting its engineering and reliability through detailed instructions. The scope of this English-language manual encompasses essential maintenance schedules, technical data, electrical equipment information, and necessary tools. It also includes critical safety information related to safety systems for homologated installations and general safety regulations. This resource is structured to empower owners, mechanics, and technicians with the knowledge required for effective vehicle maintenance and repair.