Значение и использование

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.³ 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.

Область применения

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.

1.3 Table of Contents:

SectionScope1Referenced Documents2Terminology3Summary of Test Method4Significance and Use5Reagents7Guidelines on Substitution7.1Apparatus6Preparation of Apparatus8New Engine Preparation8.1Installation of Auxiliary Systems8.2Test Procedure9Description of Test Segments and Organization9.1Engine Parts Replacement9.2Engine Starting Procedure9.3Normal Engine Shutdown Procedure9.4Emergency Shutdown Procedure9.5Unscheduled Shutdown and Downtime9.6New Engine Break-In9.7Pretest Procedure9.8Fifty-Hour Steady State Test9.9Periodic Measurements9.10Oil Sampling and Oil Addition Procedures9.11End of Test Procedure9.12Calculation and Interpretation of Test Results10Environment of Parts Measurement Area10.1Roller Follower Shaft Wear Measurements10.2Oil Analysis10.3Assessment of Test Validity10.4Final Test Report11Reporting Calibration Test Results11.1Report Forms11.2Interim Non-Valid Calibration Test Summary11.3Severity Adjustments11.4Precision and Bias12Reference Oil Precision12.1Bias12.3Keywords13ANNEXESGuidelines for Test Part Substitution or ModificationsA1Guidelines for Units and Specification FormatsA2Detailed Specifications of ApparatusA3CalibrationA4Final Report FormsA5IllustrationsA6Kinematic Viscosity @ 100C Procedure for Test SamplesA7Enhanced Gravimetric Analysis TGA ProcedureA8Sources of Materials and InformationA9Roller Follower Wear Test (RFWT) Data DictionaryA10APPENDIXESRanges for Howell LSRD-4 Reference FuelX1Diagnostic Data ReviewX2