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  • ASTM
    D8279-24 Standard Test Method for Determination of Timing-Chain Wear in a Turbocharged, Direct-Injection, Spark-Ignition, Four-Cylinder Engine
    Edition: 2024
    $143.52
    Unlimited Users per year

Description of ASTM-D8279 2024

ASTM D8279-24

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




ASTM D8279

Scope

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


Keywords

blowby; chain elongation; chain wear; engine oil; ramp; timing chain; turbocharger;


ICS Code

ICS Number Code 43.040.01 (Road vehicle systems in general)


DOI: 10.1520/D8279-24

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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