Browse Publications Technical Papers 2002-01-1672

Wear in Cummins M-11/EGR Test Engines 2002-01-1672

The Cummins M-11/EGR diesel engine test is a key tool in evaluating lubricants for the new PC-9 performance category. Wear on liners, crossheads, rocker arms and top ring faces of M-11/EGR high soot test engines operated with two different test cycles was studied through analytical surface techniques. The first test cycle used in this study was an early prototype PC-9 cycle, and the second test cycle was the PC-9 test procedure. Abrasive wear was observed on liners, crossheads and top ring faces. In addition to abrasive wear, corrosive wear was also found on M-11/EGR liners. However, no corrosive wear was observed on crossheads, rocker arms or top ring faces. Soot provides the major contribution to abrasive wear, since the widths of the relatively uniform parallel grooves in the wear scars closely match the primary soot particle sizes. More importantly, soot produced by the M-11/EGR engine was found to be harder than the engine parts. This provides more evidence to support the theory that soot-induced abrasive wear can be the dominant wear mechanism in diesel lubrication.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.