According to the numerical simulation of heavy-duty diesel engine to raise power, two methods to assess the strength of cylinder head bolt, static calculation and fatigue stress check, are introduced.

结合大功率柴油机提升功率的数值计算工作，介绍了评估气缸盖螺栓强度的两种方法：静强度分析法和疲劳强度校核法。

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After the ND4 diesel locomotive made in France only operated about 30,000 km, the cylinder heads of its AGO diesel engine cracked at the bridge of two-valve seats and other places.

由法国进口ND_4型内燃机车上的AGO柴油机气缸盖，仅运用三万公里左右即在气阀座过桥等处产生裂纹，严重影响机车安全运行。

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