1.1本试验方法通常称为约翰迪尔空化试验。该测试方法定义了重型柴油发动机，以评估与气穴引起的缸套点蚀相关的冷却液保护。 1.2以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。唯一的例外是没有直接SI等效物，如螺纹、国家管道螺纹/直径和管道尺寸。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 一般安全预防措施见附录A1。 ====意义和用途====== 开发本试验方法是为了评估重型柴油发动机冷却液对缸套气穴腐蚀现象造成的损坏提供保护的能力。 当本试验方法的所有细节均符合要求时，本试验方法可用于发动机冷却液规格验收。 本试验方法中使用的发动机设计为OEM生产柴油发动机，经过改装，以持续产生加速缸套气蚀损坏的工作条件。外推试验结果时，需要考虑该因素以及加速运行条件。

1.1 This test method is commonly referred to as the John Deere Cavitation Test. The test method defines a heavy-duty diesel engine to evaluate coolant protection as related to cylinder liner pitting caused by cavitation. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parenthesis are for information only. The only exception is where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, and tubing sizes. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See Annex A1 for general safety precautions. ====== Significance And Use ====== This test method was developed to evaluate the ability of a heavy-duty diesel engine coolant to provide protection against damage resulting from a phenomenon known as cylinder liner cavitation corrosion. This test method may be used for engine coolant specification acceptance when all details of this test method are in compliance. The design of the engine used in this test method is a production OEM diesel engine modified to consistently produce the operating conditions that accelerate damage from cylinder liner cavitation. This factor, along with the accelerated operating conditions needs to be considered when extrapolating test results.