FIELD: machine engineering, namely, restoration of engines. SUBSTANCE: method comprises steps of dressing cracking open to duct of cooling system, pressing-in sleeve that closes cracking to said duct; using metallic sleeve of material having linear expansion factor almost equal to linear expansion factor of head material. After restoration head of cylinder unit is more resistant to overheating and it does not need additional afterworking. EFFECT: low cost price of restoring operations. 2 dwg, 1 tbl
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