Gm Global Technolgoy Operations, Inc.

Antonio Rangel Machado

Steven G Bryde

Terrence J Christensen

Marcio Caldas Camargo Lima

Marcos Castanho Santanna

Marcos Basile Teixeira

A radial lip seal including an annular support with a radially extending portion having an inner periphery. An annular seal lip formed of elastomeric material such as polytetrafluoroethylene is connected to the inner periphery. The lip has an inner side adapted to seal a circumferential surface of a shaft and an outer side. The outer side of the lip has a plurality of grooves or protrusions to vary the diameter of the lip. The varied diameter creates a substantial leak between the outer side of the lip and the circumferential surface. The leak created is sufficient to be detected by a low-pressure air test.

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Sao Paulo, Brazil

Antonio Rangel Machado