Значение и использование

This test method is used to evaluate automotive engine oils for protection of engines against bearing weight loss.

This test method is also used to evaluate the SIG capabilities of multiviscosity-graded oils.

Correlation of test results with those obtained in automotive service has not been established.

Use—The Sequence VIII test method is useful for engine oil specification acceptance. It is used in specifications and classifications of engine lubricating oils, such as the following:

Specification D 4485.

API Publication 1509 Engine Oil Licensing and Certification System.

SAE Classification J304.

Область применения

1.1 This 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 spark-ignition gasoline engines. The test procedure is conducted using a carbureted, spark-ignition Cooperative Lubrication Research (CLR) Oil Test Engine (also referred to as the Sequence VIII test engine in this test method) run on unleaded fuel. An oil is evaluated for its ability to protect the engine and the oil from deterioration under high-temperature and severe service conditions. The test method can also be used to evaluate the viscosity stability of multiviscosity-graded oils. Companion test methods used to evaluate engine oil performance for specification requirements are discussed in the latest revision of Specification D 4485.

1.2 Correlation of test results with those obtained in automotive service has not been established. Furthermore, the results obtained in this test 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. The test can be used to compare one oil with another.

1.3 The values stated in SI units are to be regarded as standard, except for (1) volume which is given in the metric, but non-SI, litre, (2) certain tube measurements which are given in inch-pound units, (3) cylinder bore and stroke in both SI and inch-pound units (the inch-pound being the standard) and (4) piston displacement given in metric (non-SI) and inch-pound units (the inch-pound being the standard). In respect to (3) and (4) the inch-pound units are shown first and the SI units in parentheses.

1.4 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. Specific precautionary statements are provided throughout this test method.

1.5 This test method is arranged as follows:

SubjectSection Introduction Scope1 Referenced Documents2 Terminology3 Summary of Test Method4 Before Test Starts4.1 Power Section Installation4.2 Engine Operation (Break-in)4.3 Engine Operation (Test/Samples)4.4 Stripped Viscosity4.5 Test Completion (BWL)4.6 Significance and Use5 Evaluation of Automotive oils5.1 Stay in Grade Capabilities5.2 Correlation of Results5.3 Use5.4 Apparatus6 Test Engineering, Inc.6.1 Fabricated or Specially Prepared Items6.2 Instruments and Controls6.3 Procurement of Parts6.4 Reagents and Materials7 Reagents7.1 Cleaning Materials7.2 Expendable Power Section-Related Items7.3 Power Section Coolant7.4 Reference Oils7.5 Test Fuel7.6 Test Oil Sample Requirements8 Selection8.1 Inspection8.2 Quantity8.3 Preparation of Apparatus9 Test Stand Preparation9.1 Conditioning Test Run on Power Section9.2 General Power Section Rebuild Instructions9.3 Reconditioning of Power Section After Each Test9.4 Calibration10 Power Section and Test Stand Calibration10.1 Instrumentation Calibration10.2 Calibration of AFR Measurement Equipment10.3 Calibration of Torque Wrenches10.4 Engine Operating Procedure11 Run-In and Flush11.1 Test Operating Conditions11.2 Air-Fuel Ratio and Spark Advance11.3 Air, Off-Gas and Blowby Measurement11.4 Unscheduled Shutdowns11.5 Oil Sampling and Oil Addition11.6 Periodic Measurements11.7 Final Oil Drain and Oil Consumption Computation11.8 Operational Validity Criteria11.9 Test Completion11.10 Determination of Test Results12 Oil Analysis12.1 Test Bearing Weight Loss Determination12.2 Report14 Precision and Bias15 Precision15.1 Bias15.2 Use of ASTM Rounding16 Keywords17 ANNEXES Measurement of Connecting Rod Bearing Clearance and
Journal TaperAnnex A1 Measurement of Main Bearing ClearanceAnnex A2 The ASTM Test Monitoring Center Calibration ProgramAnnex A3 Measurement of Piston-to-Sleeve ClearanceAnnex A4 Control Chart Technique for a Laboratory's Severity
Adjustment (SA)Annex A5 Recommended New Liner Honing ProcedureAnnex A6 Sequence VIII Oil Priming ProcedureAnnex A7 Alternative Crankcase Breather ConfigurationAnnex A8 Connecting Rod Bearing Cleaning ProcedureAnnex A9 Electronic Ignition ConversionAnnex A10 System Response ProcedureAnnex A11 Air-Fuel Ratio MeasurementAnnex A12 Lead Decontamination ProcedureAnnex A13 Stay-in-Grade Oil Analysis ProcedureAnnex A14 Crankshaft Rear Seal ConditioningAnnex A15 Report Forms and Data DictionaryAnnex A16 Test Fuel SpecificationAnnex A17 APPENDIXES Role of the ASTM Test Monitoring Center and the Calibration ProgramAppendix X1 Suggested Method for Salvaging Camshaft Bearing JournalsAppendix X2 Data Log SheetsAppendix X3