ASTM D8279-20

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.

1.3 Table 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
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