ASTM D5967 Test Method for Evaluation of Diesel Engine Oils in T-8 Diesel Engine
6. Apparatus
6.1 General Description:
6.1.1 The test engine is a Mack E7-350 mechanically governed engine, P/N 11GBA77623 (see Annex A5). It is an open-chamber, in-line, six-cylinder, four-stroke, turbocharged, charge air-cooled, compression ignition engine. The bore and stroke are 124 by 165 mm (4 7/8 by 6 1/2 in.), and the displacement is 12 L (728 in.3). The engine is rated at 261 kW (350 bhp) at 1800 r/min governed speed (see SAE J1995).
6.1.2 The ambient laboratory atmosphere should be relatively free of dirt, dust, and other contaminants as required by good laboratory standards. Additionally, it is recommended that the atmosphere in the engine buildup area be filtered and controlled for temperature and humidity to prevent accumulation of dirt or dust on engine parts. Uniform temperature control will also aid in measuring and selecting parts for assembly.
6.1.3 Use the low sulfur reference diesel fuel shown in Table 1.
6.2 The Test Engine:
6.2.1 Mack Test Engine - The engine is available from Mack Trucks, Inc. A complete parts list is shown in Table A5.1, Annex A5.
6.2.2 Engine Cooling System:
6.2.2.1 A new Mack coolant conditioner shown in Table A5.1, Annex A5, is required every test to limit scaling in the cooling system. Pressurize the system to 103 kPa (15 psi) at the expansion tank.
6.2.2.2 Use a closed-loop, pressurized external engine cooling system composed of a nonferrous core heat exchanger, reservoir, and water-out temperature control valve. The system should prevent air entrainment and control jacket temperatures within the specified limit. Install a sight glass between the engine and the cooling tower to check for air entrainment and uniform flow in an effort to prevent localized boiling. Block the thermostat wide open.
6.2.3 Engine Oil System - A schematic of the engine oil system is shown in Fig. A2.9, Annex A2.
6.2.4 Auxiliary Oil System - To maintain a constant oil level in the pan, provide an additional 9.5-L (10-qt) sump by the use of a separate closed tank connected to the sump. Circulate oil through the tank at a rate of 5.7 +/- 1.9 L/min (1.5 +/- 0.5 gpm) with an auxiliary pump. A typical auxiliary oil system is shown in Fig. A2.9, Annex A2. The No. 6 and No. 8 Aeroquip lines should have inside diameters of 10 mm (3/8 in.) and 13 mm (1/2 in.), respectively. The vent line size is specified as a minimum No. 8 line size. Equivalent lines may be substituted for Aeroquip lines provided they have the proper inside diameters.
6.2.5 Crankcase Aspiration - A simple squirrel cage blower will suffice to control crankcase pressure within the test limits.
6.2.6 Blowby Meter - Use a displacement type gas meter, or equivalent, to measure blowby.
6.2.7 Air Supply and Filtration - Use an intake air filter with an initial efficiency of 99.2 %. Replace filter cartridge when 2.5 kPa (10 in. H2O) ΔP is reached. Install an adjustable valve (flapper) in the inlet air system at least two pipe diameters before any temperature, pressure, and humidity measurement devices. Use the valve to maintain inlet air restriction within required specifications.
6.2.8 Fuel Supply - Heating or cooling, or both, of the fuel supply may be required and a recommended system is shown in Fig. A2.11, Annex A2.
6.2.9 Intake Manifold Temperature Control - Control intake manifold temperature with the use of a slave intercooler.
7. Engine Fluids
7.1 Test Oil - Approximately 151 L (40 gal) of test oil are required for the test.
7.2 Test Fuel - The recommended fuel with the properties and tolerances are shown in Table 1.
7.3 Engine Coolant - Use demineralized water with less than 0.03 g/L (2 grains/gal) of salts or distilled water (do not use antifreeze solutions or other coolant additives).
7.4 Cleaning Materials - Use aliphatic naphtha, or equivalent, for cleaning parts. Other materials, such as diesel fuel, may be required by some labs to ensure parts cleanliness.
NOTE 1 - Warning: Use adequate safety precautions with all solvents and cleaners.
