Metaldyne (Plymouth, Mich.) is producing a new powder-metal crankshaft main bearing cap for medium-duty diesel-engine applications for MWM International Motores, a subsidiary of Navistar, in Brazil. The powder-metal crankshaft main bearing caps reduce the engine weight by approximately 1 pound and require fewer secondary finish machining operations. Metaldyne worked jointly with MWM over the last 18 months to demonstrate the strength and near net-shape forming advantages of powder metal over the competing casting technology.
The powder-metal main bearing cap technology was validated through extensive design analysis, dynamometer testing and customer vehicle testing. Metaldyne, an Asahi Tec company, is pursuing applications with other diesel-engine manufacturers in Europe, Asia and North America.