ASTM D8279 : 21

Standard Test Method for Determination of Timing-Chain Wear in a Turbocharged, Direct-Injection, Spark-Ignition, Four-Cylinder Engine

Standard Details

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
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

1.4 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 StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status : Historical

Standard Type: Main

Document No: ASTM D8279 : 21

Document Year: 2021

Pages: 66

Section Volume:
05.05 Volume 05.05 Petroleum Products, Liquid Fuels, and Lubricants (V): D7756–latest; Combustion Characteristics; Manufactured Carbon and Graphite Products