Wear Mechanism in Cummins M-11 High Soot Diesel Test Engines 981372
The Cummins M-11 high soot diesel engine test is a key tool in evaluating lubricants for the new PC-7 (CH-4) performance category. M-11 rocker arms and crossheads from tests with a wide range of lubricant performance were studied by surface analytical techniques. Abrasive wear by primary soot particles is supported by the predominant appearance of parallel grooves on the worn parts with their widths matching closely the primary soot particle sizes. Soot abrasive action appears to be responsible for removing the protective antiwear film and, thus, abrades against metal parts as well. Subsequent to the removal of the antiwear film, carbide particles, graphite nodules, and other wear debris are abraded, either by soot particles or sliding metal-metal contact, from the crosshead and rocker arm metal surfaces. These particles further accelerate abrasive wear. In addition to abrasive wear, fatigue wear was evident on the engine parts. Oil film thickness was determined to be the critical factor in preventing M-11 wear.
Citation: Kuo, C., Passut, C., Jao, T., Csontos, A. et al., "Wear Mechanism in Cummins M-11 High Soot Diesel Test Engines," SAE Technical Paper 981372, 1998, https://doi.org/10.4271/981372. Download Citation
Author(s):
Cheng C. Kuo, Charles A. Passut, Tze-Chi Jao, Aladar A. Csontos, James M. Howe
Affiliated:
Ethyl Petroleum Additives, Inc., University of Virginia
Pages: 15
Event:
International Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Lubricants for Passenger Car and Diesel Engines-SP-1368, SAE 1998 Transactions - Journal of Fuels and Lubricants-V107-4
Related Topics:
Diesel / compression ignition engines
Particulate matter (PM)
Wear
Graphite
Metals
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