【国外标准】 Standard Test Method for Evaluation of Engine Oils for Roller Follower Wear in Light-Duty Diesel Engine

5.1 This test method is used to determine the ability of an engine crankcase oil to control wear that can develop in the field under low to moderate engine speeds and heavy engine torques. Side-by-side comparisons of two or more oils in delivery van fleets were used to demonstrate the field performance of various oils. The specific operating conditions of this test method were developed to provide correlation with the field performance of these oils.5.2 This test method, along with other test methods, defines the minimum performance level of the Category API CG-4 for heavy duty diesel engine lubricants. Passing limits for this category are included in Specification D4485.5.3 The design of the engine used in this test method is not representative of all modern diesel engines. Consider this factor, along with the specific operating conditions used to accelerate wear, when extrapolating test results.1.1 This engine lubricant test method is commonly referred to as the Roller Follower Wear Test. Its primary result, roller follower shaft wear in the hydraulic valve lifter assembly, has been correlated with vehicles used in stop-and-go delivery service prior to 1993. It is one of the test methods required to evaluate lubricants intended to satisfy the API CG-4 performance category. This test has also been referred to as the 6.2 L Test.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, thermocouple diameters, and NPT screw threads. Also, roller follower wear is measured in mils.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.1.4 Table of Contents:  Section 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Reagents 7 Guidelines on Substitution 7.1Apparatus 6Preparation of Apparatus 8 New Engine Preparation 8.1 Installation of Auxiliary Systems and Miscellaneous Components 8.2Test Procedure 9 Description of Test Segments and Organization of Test Procedure Sections 9.1 Engine Parts Replacement 9.2 Engine Starting Procedure 9.3 Normal Engine Shutdown Procedure 9.4 Emergency Shutdown Procedure 9.5 Unscheduled Shutdown and Downtime 9.6 New Engine Break-In 9.7 Pretest Procedure 9.8 Fifty-Hour Steady State Test 9.9 Periodic Measurements 9.10 Oil Sampling and Oil Addition Procedures 9.11 End of Test (EOT) Procedure 9.12Calculation and Interpretation of Test Results 10 Environment of Parts Measurement Area 10.1 Roller Follower Shaft Wear Measurements 10.2 Oil Analysis 10.3 Assessment of Test Validity 10.4Final Test Report 11 Reporting Calibration Test Results 11.1 Report Forms 11.2 Interim Non-Valid Calibration Test Summary 11.3 Severity Adjustments 11.4Precision and Bias 12 Precision 12.1 Precision Estimate 12.2 Bias 12.3Keywords 13ANNEXESGuidelines for Test Part Substitution or Modification Annex A1Guidelines for Units and Specification Formats Annex A2Detailed Specifications of Apparatus Annex A3Calibration Annex A4Final Report Forms Annex A5Illustrations Annex A6Kinematic Viscosity at 100°C Procedure for the Roller Follower Wear Test Annex A7Enhanced Thermal Gravimetric Analysis (TGA) Procedure for Soot Measurement Annex A8Sources of Materials and Information Annex A9APPENDIXESPC-9 Reference Diesel Fuel Properties Appendix X1Diagnostic Data Review Appendix X21.5 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.