1、Designation:D827922aStandard Test Method forDetermination of Timing-Chain Wear in a Turbocharged,Direct-Injection,Spark-Ignition,Four-Cylinder Engine1This standard is issued under the fixed designation D8279;the number immediately following the designation indicates the year oforiginal adoption or,i
2、n the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONPortions of this test method are written for use by laboratories that make use of ASTM
3、TestMonitoring Center(TMC)2services(see Annex A1 to Annex A4).The TMC provides reference oils,and engineering and statistical services to laboratories that desireto produce test results that are statistically similar to those produced by laboratories previouslycalibrated by the TMC.In general,the Te
4、st Purchaser decides if a calibrated test stand is to be used.Organizations such astheAmerican Chemistry Council require that a laboratory utilize the TMC services as part of their testregistration process.In addition,the American Petroleum Institute and the Gear Lubricant ReviewCommittee of the Lub
5、ricant Review Institute(SAE International)require that a laboratory use theTMC services in seeking qualification of oils against their specifications.The advantage of using the TMC services to calibrate test stands is that the test laboratory(andhence the Test Purchaser)has an assurance that the tes
6、t stand was operating at the proper level of testseverity.It should also be borne in mind that results obtained in a non-calibrated test stand may notbe the same as those obtained in a test stand participating in the ASTM TMC services process.Laboratories that choose not to use the TMC services may
7、simply disregard these portions.ASTM International policy is to encourage the development of test procedures based on genericequipment.It is recognized that there are occasions where critical/sole-source equipment has beenapproved by the technical committee(surveillance panel/task force)and is requi
8、red by the testprocedure.The technical committee that oversees the test procedure is encouraged to clearly identifyif the part is considered critical in the test procedure.If a part is deemed to be critical,ASTMencourages alternative suppliers to be given the opportunity for consideration of supplyi
9、ng the criticalpart/component providing they meet the approval process set forth by the technical committee.An alternative supplier can start the process by initiating contact with the technical committee(current chairs shown on ASTM TMC website).The supplier should advise on the details of the part
10、that is intended to be supplied.The technical committee will review the request and determinefeasibility of an alternative supplier for the requested replacement critical part.In the event that areplacement critical part has been identified and proven equivalent,the sole-source supplier footnoteshal
11、l be removed from the test procedure.1.Scope*1.1 Undesirable timing-chain wear has been observed withgasoline,turbocharged,direct-injection(GTDI)engines in fieldservice,and data from correlating laboratory engine tests haveshown that chain wear can be affected by appropriatelyformulated engine lubri
12、cating.A laboratory engine test hasbeen developed to provide a means for screening lubricatingoils for that specific purpose.The laboratory engine test is216 h in length,conducted under varying conditions,and theincrease in timing-chain length determined at the end of test is1This test method is und
13、er the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.B0 on Automotive Lubricants.Current edition approved Sept.1,2022.Published September 2022.Originallyapproved in 2019.Last previous edition approved in 2021 a
14、s D8279 22.DOI:10.1520/D8279-22A.2Until the next revision of this test method,the ASTM Test Monitoring Centerwill update changes in the test method by means of information letters.Informationletters may be obtained from the ASTM Test Monitoring Center,203 ArmstrongDrive,Freeport,PA 16229.Attention:D
15、irector.This edition incorporates revisionsin all Information Letters through No.22-1.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed
16、 in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1the primary result.This test method is commonly known as theSequence X,Chain Wear(CW)Test.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for informati
