ASTM D5966-09

1.1 This engine lubricant test method is commonly referred to as the Roller Follower Wear Test. Its primary result, roller follower shaft wear in the hydraulic valve lifter assembly, has been correlated with vehicles used in stop-and-go delivery service prior to 1993. It is one of the test methods required to evaluate lubricants intended to satisfy the API CG-4 performance category. This test has also been referred to as the 6.2 L Test.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.2.1 Exceptions - Where there is no direct SI equivalent, such as pipe fittings, thermocouple diameters, and NPT screw threads. Also, roller follower wear is measured in mils.

1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.

1.4 Table of Contents:

	Section
Scope	1
Referenced Documents	2
Terminology	3
Summary of Test Method	4
Significance and Use	5
Reagents	7
Guidelines on Substitution	7.1
Apparatus	6
Preparation of Apparatus	8
New Engine Preparation	8.1
Installation of Auxiliary Systems and Miscellaneous Components	8.2
Test Procedure	9
Description of Test Segments and Organization of Test Procedure Sections	9.1
Engine Parts Replacement	9.2
Engine Starting Procedure	9.3
Normal Engine Shutdown Procedure	9.4
Emergency Shutdown Procedure	9.5
Unscheduled Shutdown and Downtime	9.6
New Engine Break-In	9.7
Pretest Procedure	9.8
Fifty-Hour Steady State Test	9.9
Periodic Measurements	9.10
Oil Sampling and Oil Addition Procedures	9.11
End of Test (EOT) Procedure	9.12
Calculation and Interpretation of Test Results	10
Environment of Parts Measurement Area	10.1
Roller Follower Shaft Wear Measurements	10.2
Oil Analysis	10.3
Assessment of Test Validity	10.4
Final Test Report	11
Reporting Calibration Test Results	11.1
Report Forms	11.2
Interim Non-Valid Calibration Test Summary	11.3
Severity Adjustments	11.4
Precision and Bias	13
Precision	13.1
Precision Estimate	13.2
Bias	13.3
Keywords	14
ANNEXES
Guidelines for Test Part Substitution or Modification	Annex A1
Guidelines for Units and Specification Formats	Annex A2
Detailed Specifications of Apparatus	Annex A3
Calibration	Annex A4
Final Report Forms	Annex A5
Illustrations	Annex A6
Kinematic Viscosity at 100°C Procedure for the Roller Follower Wear Test	Annex A7
Enhanced Thermal Gravimetric Analysis (TGA) Procedure for Soot Measurement	Annex A8
Sources of Materials and Information	Annex A9
APPENDIXES
PC-9 Reference Diesel Fuel Properties	Appendix X1
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