ASTM D6681-23

Section Scope 1 Referenced Documents 2 Terminology 3 Summary of Test Method 4 Significance and Use 5 Apparatus and Installation 6  Intake Air System 6.2.1  Exhaust System 6.2.2  Fuel System 6.2.3  Oil Consumption System 6.2.4  Engine Oil System 6.2.5   Oil Heating System 6.2.5.1   Oil Sample Valve 6.2.5.2  Engine Coolant System 6.2.6  Engine Instrumentation 6.2.7 Reagents and Materials 7 Oil Samples 8 Preparation of Apparatus 9  General Engine Assembly Practices 9.1  Complete Engine Inspection 9.2  Copper Components 9.3  Engine Lubricant System Flush 9.4  Engine Piston Cooling Jets 9.5  Engine Measurements and Inspections 9.6  Cylinder Head 9.7  Valve Guide Bushings 9.8  Fuel Injector 9.9  Piston and Rings 9.10  Cylinder Liner 9.11  Compression Ratio 9.12  Engine Timing 9.13  Engine Coolant System Cleaning Procedure 9.14 Calibration and Standardization 10  Test Cell Instrumentation 10.1  Instrumentation Standards 10.2  Coolant Flow 10.3  Re-calibration Requirements 10.4  Fuel Injectors 10.5  Air Flow 10.6  Intake Air Barrel 10.7  Fuel Filter 10.8  Oil Scale Flow Rates 10.9  Calibration of Test Stands 10.10  Extending Test Stand Calibration Period 10.11  Test Run Numbering 10.13  Humidity Calibration Requirements 10.14  Calibration of Piston Deposit Raters 10.15 Procedure 11  Engine Break-in Procedure 11.1  Cool-down Procedure 11.2  Warm-up Procedure 11.3  Shutdowns and Lost Time 11.4  Periodic Measurements 11.5  Engine Control Systems 11.6   Engine Coolant 11.6.1   Engine Fuel System 11.6.2   Engine Oil Temperature 11.6.3   Exhaust Pressure 11.6.4   Intake Air 11.6.5  Post-Test Procedures 11.7   Piston Ring Side Clearances 11.7.1   Piston Ratings 11.7.2    Referee Ratings 11.7.3   Ring End Gap Increase 11.7.4   Cylinder Liner Wear 11.7.5   Cylinder Liner Bore Polish 11.7.6   Photographs 11.7.7 Calculation and Interpretation of Results 12  Test Validity 12.1  Calculations 12.2   Quality Index 12.2.1   Oil Consumption 12.2.2 Report 13  Forms and Data Dictionary 13.1  Test Validity 13.2  Report Specifics 13.3 Precision and Bias 14  Precision 14.1  Bias 14.1.4 Keywords 15 Annexes Engine and Parts Warranty Annex A1 Instrument Locations, Measurements, and Calculations Annex A2 Cooling System Arrangement Annex A3 Intake Air Mass Flow Sensor Installation Annex A4 Fuel System Design and Required Components Annex A5 Oil System Annex A6 Exhaust and Intake Barrel Piping Annex A7 Humidity Probe Installation (Location) Annex A8 Return Goods Authorization (Claim Form) Annex A9 Engine Assembly Information Annex A10 Flushing Instructions and Apparatus Annex A11 Warm-up, Cool-down and Testing Conditions Annex A12 Piston and Liner Rating Modifications Annex A13 Additional Report Forms Annex A14 Test Report Forms Annex A15 Appendixes Various Examples for Reference Purposes Appendix X1 Safety Appendix X2