The book contains technical characteristics and detailed recommendations for the repair of engines YaMZ-236, YaMZ-238, YaMZ-238A, YaMZ-238G, YaMZ-238I and YaMZ-238K, the technology of disassembly, assembly of engines and fault detection of parts is considered, allowable wear and recommendations for restoration of parts are indicated, technical requirements for repaired units are given, parts and engines, modes of running-in and testing of engines, specifications for acceptance of engines after repair and instructions for operational run-in of the repaired engine are given, reference data on glands, rolling bearings and tightening torques of threaded joints used on engines are given. The book is intended for engineering and technical workers of enterprises and organizations engaged in the repair of YaMZ engines.