Standard Test Method for Determination of Timing-Chain Wear in a Turbocharged, Direct-Injection, Spark-Ignition, Four-Cylinder Engine
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.
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:
Summary of Test Method
Significance and Use
Reagents and Materials
Preparation of Apparatus
Timing-chain Preparation, Installation, and Measurement
Test Stand Installation
Electronic Throttle Controller
Pre-Test Procedure and Engine Break-In
Engine Start-up Procedures
Engine Shutdown Procedures
Blowby Flowrate Measurement
Oil Consumption Calculation
Special Maintenance Procedures
Blowby Flowrate Adjustment
Diagnostic Data Review
Precision and Bias
ASTM TMC Organization
ASTM TMC: Calibration Procedures
ASTM TMC: Maintenance Activities
ASTM TMC: Related Information
Engine and Stand Parts
Engine Rebuild Templates
Engine Build Records
Cylinder Head Build
Cylinder Bore Measurement
Bearing Journal Measurements
Engine Part Photographs, Schematics and Figures
Control and Data Acquisition Requirements
Dipstick Oil Level to Charge Conversions
Sequence X Report Forms and Data Acquisition
Sources of Materials and Information
Suggested Designs for Engine Fixing Brackets
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.
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