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5.1 This test method evaluates an automotive engine oil's lubricating efficiency in inhibiting timing-chain lengthening under operating conditions selected to accelerate timing-chain wear. Varying quality reference oils of known wear performance were used in developing the operating conditions of the test procedure.5.2 The test method can be used to screen lubricants for satisfactory lubrication of an engine timing chain and has application in gasoline, automotive, engine-oil specifications. It is expected to be used in specifications and classifications of engine lubricating oils, such as the following:5.2.1 ILSAC GF-6.5.2.2 Specification D4485.5.2.3 SAE Classification J183.1.1 Undesirable 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.1.2 The 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.1.2.1 Exception—Where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing size, or specified single source equipment.1.3 Table of Contents:   Section 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Apparatus 6 Test Engine 6.1Reagents and Materials 7Preparation 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 8.26Stand Calibration 9Test 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 10.10Diagnostic Data Review 11Test Results 12Report 13Precision and Bias 14Keywords 15ANNEXES  ASTM TMC Organization Annex A1ASTM TMC: Calibration Procedures Annex A2ASTM TMC: Maintenance Activities Annex A3ASTM TMC: Related Information Annex A4Engine and Stand Parts Annex A5Safety Precautions Annex A6Engine Rebuild Templates Annex A7Engine Build Records Annex A8Cylinder Head Build A8.1Cylinder Bore Measurement A8.2Bearing Journal Measurements A8.3Engine Part Photographs, Schematics and Figures Annex A9Control and Data Acquisition Requirements Annex A10Dipstick Oil Level to Charge Conversions Annex A11Sequence X Report Forms and Data Acquisition Annex A12APPENDIXES  Sources of Materials and Information Appendix X1Suggested Designs for Engine Fixing Brackets Appendix X21.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 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.

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