1.1 该试验方法测量曲轴箱油控制配备顶置配气机构和滑动凸轮从动件的火花点火式发动机凸轮轴凸角磨损的能力。该试验方法旨在模拟发动机怠速车辆的长时间运行。序列IVA测试方法使用日产KA24E发动机。主要结果是凸轮轴凸角磨损（在十二个凸角周围的七个位置测量）。次要结果包括凸轮凸角鼻部磨损和用过的发动机油中铁磨损金属浓度的测量。 其他测定，如曲轴箱油的燃料稀释度、有色金属磨损浓度和总油耗，可用于评估测试结果的有效性。 2. 1.2 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.2.1、 例外情况- 如果没有直接的SI等效物，如管件、卡套管、NPT螺纹/直径或指定的单源设备。 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）。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 看见 附件A8 具体的安全预防措施。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该试验方法旨在评估汽车润滑油对配备滑动凸轮从动件的顶置配气机构发动机凸轮凸角磨损的控制效果。 注1: 此测试方法可用于发动机机油规格，例如规格 天4485 、API 1509、SAE J183和ILSC GF 3。

1.1 This test method measures the ability of crankcase oil to control camshaft lobe wear for spark-ignition engines equipped with an overhead valve-train and sliding cam followers. This test method is designed to simulate extended engine idling vehicle operation. The Sequence IVA Test Method uses a Nissan KA24E engine. The primary result is camshaft lobe wear (measured at seven locations around each of the twelve lobes). Secondary results include cam lobe nose wear and measurement of iron wear metal concentration in the used engine oil. Other determinations such as fuel dilution of crankcase oil, non-ferrous wear metal concentrations, and total oil consumption, can be useful in the assessment of the validity of the test results. 2 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exceptions— Where there is no direct SI equivalent such as pipe fittings, tubing, NPT screw threads/diameters, or single source equipment specified. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Annex A8 for specific safety precautions. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method was developed to evaluate automotive lubricant’s effect on controlling cam lobe wear for overhead valve-train equipped engines with sliding cam followers. Note 1: This test method may be used for engine oil specifications, such as Specification D4485 , API 1509, SAE J183, and ILSC GF 3.