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.

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 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 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