Significance and Use
This test method is used to determine the ability of an engine crankcase oil to control wear that can develop in the field under low to moderate engine speeds and heavy engine loads. Side-by-side comparisons of two or more oils in delivery van fleets were used to demonstrate the field performance of various oils. The specific operating conditions of this test method were developed to provide correlation with the field performance of these oils.
This test method, along with other test methods, defines the minimum performance level of the Category API CG-4 for heavy duty diesel engine lubricants. Passing limits for this category are included in Specification D 4485
The design of the engine used in this test method is not representative of all modern diesel engines. This factor, along with the specific operating conditions used to accelerate wear, shall be considered when extrapolating test results.
Scope
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 of units used in this test method are stated in either inch-pound units or SI units and are to be regarded separately as the standard.
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 |
| Diagnostic Data Review | Appendix X2 |
