Significance and Use
5.1 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.
5.2 The test method is used for engine oil specification acceptance when all details of the procedure are followed.
Scope
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).2 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 kilowatt-hour.
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, health, and environmental 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 Method
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 Oil
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 Δ 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 D5967 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
Mack T-8A, T-8, and T-8E Fuel Requirements
Annex A10
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.