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柴油机的气缸盖、主轴承盖及连杆大头盖等部位，连接螺栓的轴向预紧力决定了螺栓连接牢度、密封性及可靠性。 用扳手拧紧螺栓使其产生轴向拉力时，螺栓同时承受拉应力和扭应力，当拉应力达到材料屈服强度的８０％时，螺栓就会产生塑性变形，因此，紧固螺栓通常是在其弹性变形区
Diesel engine cylinder head, main bearing cover and connecting rod cover and other parts of the bolt axial preload determines the bolting fastness, sealing and reliability. Tighten the bolt with a wrench to produce axial tension, the bolt at the same time bear tensile stress and torsional stress, when the tensile stress reaches 80% of the material yield strength, the bolt will have plastic deformation, therefore, the fastening bolt is usually in its flexibility Deformation zone