ASTM D6975 – 04 test method for Cummins M11 Exhaust Gas Recirculation Test (EGR)

ASTM D6975 – 04 test method for Cummins M11 Exhaust Gas Recirculation Test (EGR)

This test method is commonly known as the Cummins M11 Exhaust Gas Recirculation Test (EGR). The test method defines a heavy-duty diesel engine test procedure carried under high soot conditions to determine oil performance allied with valve train wear, sludge deposits, and oil filter plugging in an EGR environment.

    Scope:

    ASTM D6975 – 04 test method is established to determine the engine oil performance to manage the wear of the engine as well as deposits under intense operating conditions selected to speed up soot generation, valve train wear and deposit formation in a turbocharged, aftercooled four-stroke-cycle diesel engine equipped with an exhaust gas recirculation hardware.

    Test Procedure:

    Test operation includes a 25-min warm-up, a 2-h break-in, and 300 h in six 50-h stages. During stages A, C, and E, the engine is operated with retarded fuel injection timing and is over fueled to generate excess soot. During stages B, D, and F, the engine is operated at conditions to induce valve train wear.  The engine is cleaned and assembled with new cylinder liners, pistons, piston rings, and overhead valve train components before each test. At the end of each 25-h period a forced oil drain, an oil sample, and an oil addition, equivalent to an oil consumption of 0.23 g/kW-h, is performed. The test stand is equipped with the appropriate instrumentation to control engine speed, fuel flow, and other operating parameters. 

    Oil performance is determined by assessing crosshead wear at 8.5 mass % soot, sludge deposits, and oil filter plugging.

    Youtube Video:

    Specimen Size:

    This test method uses a Cummins M11 400 diesel engine with a specially modified engine block.

    Data:

    For calculation of Mass loss
    Calculate the ∆/s for each crosshead as follows:


    Where:
    Xi: individual crosshead mass loss in mg.
    X average mass loss of crosshead group (intake or exhaust),
    S: standard deviation of the mass loss of the group
    For Mass % Average Soot

    Mass %=10^(LogX-0.2575×(AS-4.6%)

    Where,
    X = Outlier Screened Crosshead Average Mass Loss value in the Overall Summary,
    AS = 13 point average of the 25 h reported soot values (calculated).
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