Scope
1.1 This test method is commonly referred to as the Mack T-8. This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading).
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 either SI or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound units are generally shown in parentheses when combined with SI units, and vice versa.
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:
| Scope | 1 |
| Referenced Documents | 2 |
| Terminology | 3 |
| Summary of Test Methods | 4 |
| Significance and Use | 5 |
| Apparatus | 6 |
| General Description | 6.1 |
| The Test Engine | 6.2 |
| Mack Test Engine | 6.2.1 |
| Engine Cooling System | 6.2.2 |
| Engine Oil System | 6.2.3 |
| Auxiliary Oil System | 6.2.4 |
| Crankcase Aspiration | 6.2.5 |
| Blowby Meter | 6.2.6 |
| Air Supply and Filtration | 6.2.7 |
| Fuel Supply | 6.2.8 |
| Intake Manifold Temperature Control | 6.2.9 |
| Engine Fluids | 7 |
| Test Oils | 7.1 |
| Test Fuel | 7.2 |
| Engine Coolant | 7.3 |
| Cleaning Materials | 7.4 |
| Preparation of Apparatus at Rebuild | 8 |
| Cleaning of Parts | 8.1 |
| Valves, Seats, Guides, and Springs | 8.2 |
| Cylinder Liner, Piston, and Piston Ring Assembly | 8.3 |
| Injectors and Injection Pump | 8.4 |
| Assembly Instructions | 8.5 |
| Measurements | 8.6 |
| Laboratory and Engine Test Stand Calibration/Non-Reference Requirements | 9 |
| Calibration Frequency | 9.1 |
| Calibration Reference Oils | 9.2 |
| Test Numbering | 9.3 |
| New Laboratories and New Test Stands | 9.4 |
| Calibrated Laboratories and Test Stands | 9.5 |
| Calibration Test Acceptance | 9.6 |
| Failing Calibration Tests | 9.7 |
| Non-Reference Oil Test Requirements | 9.8 |
| Procedure | 10 |
| Pretest Procedure | 10.1 |
| Engine Start-Up | 10.2 |
| Engine Shutdown | 10.3 |
| Test Cycle | 10.4 |
| Oil Addition/Drain | 10.5 |
| Oil Samples | 10.6 |
| Oil Consumption Calculations | 10.7 |
| Fuel Samples | 10.8 |
| Periodic Measurements | 10.9 |
| Blowby | 10.10 |
| Centrifugal Oil Filter Mass Gain | 10.11 |
| Oil Filter ∇P Calculation | 10.12 |
| Post Test | 10.13 |
| Inspection of Fuel and Oil During Test | 11 |
| Oil Inspection | 11.1 |
| Fuel Inspections | 11.2 |
| Oil Consumption | 11.3 |
| Report | 12 |
| Reporting Test Results | 12.1 |
| Deviations from Test Operational Limits | 12.2 |
| Electronic Transmission of Test Results | 12.3 |
| Plots of Operational Data | 12.4 |
| Precision and Bias | 13 |
| Precision | 13.1 |
| Bias | 13.2 |
| Keywords | 14 |
| Annexes | |
| Report Forms | Annex A1 |
| Sensor Locations | Annex A2 |
| Kinematic Viscosity At 100°C For Test Method D 5967 Samples | Annex A3 |
| Enhanced Thermal Gravimetric Analysis (TGA) Procedure | Annex A4 |
| Procurement of Test Materials | Annex A5 |
| Safety Precautions | Annex A6 |
| Data Dictionary | Annex A7 |
| T-8E Extended Length Test Requirements | Annex A8 |
| T-8A Abbreviated Length Test Requirements | Annex A9 |
