FIELD: engine engineering. SUBSTANCE: cylinder head has outlet valve 1 with guide bushing 2 whose bottom part provided with expanding space 3 which is filled with air via passage 4. At the top part of the rod in the zone of intersection of plane of face with the guide bushing is provided with additional oil receiving ring groove 5 whose space is coupled with the expanding space via longitudinal screw groove 6 provided on the rod of the valve. Volume of the screw groove is equal 0.1 of volume of the expanding space. EFFECT: improved design. 1 dwg
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