Significance and Use
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.
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.
