Значение и использование

This test method was developed to evaluate the viscometric performance of engine oils in turbocharged and intercooled four-cycle diesel engines. Results are obtained from used oil analysis.

The test method is used for engine oil specification acceptance when all details of the procedure are followed.

Область применения

1.1 This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading). This test method is commonly referred to as the Mack T-8.

1.2 This test method also provides the procedure for running an extended length T-8 test, which is commonly referred to as the T-8E and an abbreviated length test, which is commonly referred to as T-8A. The procedures for the T-8E and the T-8A are identical to the T-8 with the exception of the items specifically listed in Annex A8 and Annex A9 respectively. Additionally, the procedure modifications listed in Annex A8 and Annex A9 refer to the corresponding section of the T-8 procedure.

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

1.3.1 Exceptions—Where there is no direct SI equivalent such as the units for screw threads, National Pipe Threads/diameters, tubing size, sole source equipment suppliers, and oil consumption in grams per kilowatthour.

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 and health practices and determine the applicability of regulatory limitations prior to use. See Annex A6 for specific safety precautions.

1.5 A Table of Contents follows:

Scope1 Referenced Documents2 Terminology3 Summary of Test Method4 Significance and Use5 Apparatus6 General Description6.1 The Test Engine6.2 Mack Test Engine6.2.1 Engine Cooling System6.2.2 Engine Oil System6.2.3 Auxiliary Oil System6.2.4 Crankcase Aspiration6.2.5 Blowby Meter6.2.6 Air Supply and Filtration6.2.7 Fuel Supply6.2.8 Intake Manifold Temperature Control6.2.9 Engine Fluids7 Test Oil7.1 Test Fuel7.2 Engine Coolant7.3 Cleaning Materials7.4 Preparation of Apparatus at Rebuild8 Cleaning of Parts8.1 Valves, Seats, Guides, and Springs8.2 Cylinder Liner, Piston, and Piston Ring Assembly8.3 Injectors and Injection Pump8.4 Assembly Instructions8.5 Measurements8.6 Laboratory and Engine Test Stand Calibration/Non-Reference
Requirements9 Calibration Frequency9.1 Calibration Reference Oils9.2 Test Numbering9.3 New Laboratories and New Test Stands9.4 Calibrated Laboratories and Test Stands9.5 Calibration Test Acceptance9.6 Failing Calibration Tests9.7 Non-Reference Oil Test Requirements9.8 Procedure10 Pretest Procedure10.1 Engine Start-Up10.2 Engine Shutdown10.3 Test Cycle10.4 Oil Addition/Drain10.5 Oil Samples10.6 Oil Consumption Calculations10.7 Fuel Samples10.8 Periodic Measurements10.9 Blowby10.10 Centrifugal Oil Filter Mass Gain10.11 Oil Filter ΔP Calculation10.12 Post Test10.13 Inspection of Fuel and Oil During Test11 Oil Inspection11.1 Fuel Inspections11.2 Oil Consumption11.3 Report 12 Reporting Test Results12.1 Deviations from Test Operational Limits12.2 Electronic Transmission of Test Results12.3 Plots of Operational Data12.4 Precision and Bias13 Precision13.1 Bias13.2 Keywords14 Annexes Report FormsAnnex A1 Sensor LocationsAnnex A2 Kinematic Viscosity At 100°C For Test Method D 5967 Samples Annex A3 Enhanced Thermal Gravimetric Analysis (TGA) ProcedureAnnex A4 Procurement of Test MaterialsAnnex A5 Safety PrecautionsAnnex A6 Data DictionaryAnnex A7 T-8E Extended Length Test RequirementsAnnex A8 T-8A Abbreviated Length Test RequirementsAnnex A9