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Increased leakage problems in automotive and truck engine water pumps has been experienced due to the effect of face-filming (buildup of crystalline deposits) . Seal leakage failures are related to the sealing face materials, the coolant formulation, and the mechanical seal design. Over the last few years, sintered silicon carbide as a low friction material has found increased acceptance and usage as a water pump seal face material to withstand more stringent service conditions for wear resistance, thermal shock resistance, and stability of shape. This paper discusses the relationship of key material properties and surface characteristics on face-filming and service life improvement. Aspects of seal design, face material combinations, and new material developments are discussed.

Diesel engine technology has progressed through various design and materials improvements as previously have other engine concepts. Present diesel engines exhibit excellent fuel economy and reliability, having increased in popularity for automotive transportation and encouraged new developments in aircraft diesels. Further developments are now on the horizon for advances in higher temperature operation, low friction potential, and extended durability through the use of ceramics in key component hardware. In the present paper the authors, on the basis of past and present experience, discuss applications for silicon carbide components and the relevance of associated developments in joining technology and non-destructive evaluation.