A consortium has been formed to address seal problems in the Aerospace sector of Allied Signal , Inc. The consortium is represented by makers of Propulsion Engines , Auxiliary Power Units , Gas Turbine Starters , etc . The goal is to improve Face Seal reliability , since Face Seals have become reliability drivers in many of our product lines . Several research programs are being implemented simultaneously this year . They include : Face Seal Modeling and Analysis Methodology ; Oil Cooling of Seals ; Seal Tracking Dynamics ; Coking Formation & Prevention ; and Seal Reliability Methods .