【国外标准】 Standard Test Method for Evaluation of Automotive Engine Oils in the CRC L-38 Spark-Ignition Engine (Withdrawn 2003)

1.1 This engine oil test method covers the evaluation of automotive engine oils (SAE grades 5W 10W, 20, 30, 40, and 50, and multiviscosity grades) intended for use in either spark-ignition gasoline engines, or in diesel engines. The test procedure is conducted using a carbureted, spark-ignition Cooperative Lubrication Research (CLR) Oil Test Engine (referred to as the L-38 engine in this test method). An oil is evaluated for protection against engine and oil deterioration under high-temperature, heavy-duty service conditions. The test method can also be used to evaluate the viscosity stability of multiviscosity-graded oils.1.2 The two measures of engine deterioration used in this test method are (1) weight loss of copper-lead bearings used in the test power section, and (2) varnish and sludge deposits on power section parts.1.3 The two measures of oil deterioration used in this test method are (1) the change in the acid number of the oil, and (2) the change in the viscosity of the oil during the test period.1.4 Correlation of test results with those obtained in automotive service has not been established. Furthermore, the results obtained in this test method are not necessarily indicative of results that will be obtained in a full-scale automotive spark-ignition or compression-ignition engine, or in an engine operated under conditions different from those of the test method. The test can be used to compare one oil with another.Note 1—Companion test methods used to evaluate engine oil performance for specification requirements include the following current versions of single-cylinder and multicylinder engine tests:ASTM STP 509A, Single Cylinder Engine Tests for Evaluating the Performance of Crankcase Lubricants Part I, Caterpillar 1G2 Test MethodPart II, Caterpillar 1H2 Test MethodASTM STP 315H, Multicylinder Test Sequences for Evaluating Engine OilsPart 1, Sequence IIDPart 2, Sequence IIIDPart 3, Sequence V-DASTM Research Report RR:D02-1225 Sequence IIIE, Multicylinder Test Sequence for Evaluating Automotive Engine OilsASTM D02 Proposal P212, Proposed Test Method for VE Test ProcedureAlso, see Engine Oil Tests—SAE J304 for details on these and other engine oil test methods.1.5 The values stated in inch-pound units are to be regarded as the standard; except for the case of bearing weight measurements, for which the unit is milligram; and except for viscosity measurements, for which the temperatures of measurement are expressed in C (degrees Celsius). SI values are given in parentheses. In cases where materials, products, or equipment are available only in inch-pound units, SI units are omitted.1.6 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.1.7 This test method is arranged as follows: SectionIntroduction 1Referenced Documents 2Terminology 3Summary of Test Method 4Significance and Use 5Apparatus 6Test Engineering, Inc. 6.1Fabricated or Specially Prepared Items 6.2Instruments and Controls 6.3Procurement of Parts 6.4Reagents and Materials 7Test Oil Sample Requirements 8Preparation of Apparatus 9Test Stand Preparation 9.1Conditioning Test Run on Power Section 9.2General Power Section Rebuild Instructions 9.3Reconditioning of Power Section After Each Test 9.4Calibration 10Power Section and Test Stand Calibration 10.1Instrumentation Calibration 10.2Engine Operating Procedure 11Run-In and Flush 11.1Intermediate Bearing Weight Loss Checks 11.2Test Operating Conditions 11.3Warm-up Schedule 11.4Air-Fuel Ratio and Spark Advance 11.5Rocker Cover Air, Off-gas, and Blowby Measurement 11.6Shut-down and Oil-Drain Procedure 11.7Oil Sampling and Oil Addition 11.8Oil Consumption Computation 11.9Periodic Measurements 11.10Determination of Test Results 12Report 13Precision and Bias 14Use of ASTM Rounding 15Keywords 16AnnexesSpecification for Soltrol 107, 8 Annex A1Measurement of Connecting Rod Bearing Clearance and Journal Taper Annex A2Measurement of Main Bearing Clearance Annex A3The ASTM Test Monitoring Center Calibration Program Annex A4Data Log Sheets Annex A5Measurement of Piston-to-Sleeve Clearance Annex A6Control Chart Technique for a Laboratory's Severity Adjustment (SA) Annex A7Recommended New Liner Honing Procedure Annex A8L-38 Oil Priming Procedure Annex A9Alternative Crankcase Breather Configurations Annex A10Connecting Rod Bearing Cleaning Procedure Annex A11L-38 Electronic Ignition Conversion Procedure Annex A12System Response Procedure Annex A13Air-Fuel Ratio Measurement Annex A14L-38 Engine Evaluation Report Forms Annex A15Data Dictionary Annex A16Stripped Viscosity Measurement Procedure Annex A17Role of the ASTM Test Monitoring Center and the Calibration Program Appendix X1Suggested Method for Salvaging Camshaft Bearing Journals Appendix X2