ASTM D8279-24 PDF
1.1Undesirable timing-chain wear has been observed with gasoline, turbocharged, direct-injection (GTDI) engines in field service, and data from correlating laboratory engine tests have shown that chain wear can be affected by appropriately formulated engine lubricating. A laboratory engine test has been developed to provide a means for screening lubricating oils for that specific purpose. The laboratory engine test is 216 h in length, conducted under varying conditions, and the increase in timing-chain length determined at the end of test is the primary result. This test method is commonly known as the Sequence X, Chain Wear (CW) Test.
1.2The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.2.1Exception-Where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing size, or specified single source equipment.
1.3Table of Contents:
Section Scope 1 Referenced Documents 2 Terminology 3 Summary of Test Method 4 Significance and Use 5 Apparatus 6 Test Engine 6.1 Reagents and Materials 7 Preparation of Apparatus 8 Timing-chain Preparation, Installation, and Measurement 8.20 Test Stand Installation 8.21 Electronic Throttle Controller 8.21.17 Temperature Measurement 8.23 Pressure Measurement 8.24 Flowrate Measurement 8.25 Blowby Flowrate 8.26 Stand Calibration 9 Test Procedure 10 Pre-Test Procedure and Engine Break-In 10.1 Engine Start-up Procedures 10.2 Test Sequence 10.3 Engine Shutdown Procedures 10.4 Blowby Flowrate Measurement 10.5 Parameter Logging 10.6 Oil Consumption Calculation 10.7 General Maintenance 10.8 Special Maintenance Procedures 10.9 Blowby Flowrate Adjustment 10.10 Diagnostic Data Review 11 Test Results 12 Report 13 Precision and Bias 14 Keywords 15 ANNEXES ASTM TMC Organization Annex A1 ASTM TMC: Calibration Procedures Annex A2 ASTM TMC: Maintenance Activities Annex A3 ASTM TMC: Related Information Annex A4 Engine and Stand Parts Annex A5 Safety Precautions Annex A6 Engine Rebuild Templates Annex A7 Engine Build Records Annex A8 Cylinder Head Build A8.1 Cylinder Bore Measurement A8.2 Bearing Journal Measurements A8.3 Engine Part Photographs, Schematics and Figures Annex A9 Control and Data Acquisition Requirements Annex A10 Dipstick Oil Level to Charge Conversions Annex A11 Sequence X Report Forms and Data Acquisition Annex A12 APPENDIXES Sources of Materials and Information Appendix X1 Suggested Designs for Engine Fixing Brackets Appendix X2
1.4This 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.
1.5This 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.
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