This timing cover seal sits between the engine timing cover and the cylinder block, preventing oil leakage from the front of the engine. It is a molded rubber or elastomeric gasket that compresses into the machined groove on the timing cover. A degraded seal allows oil to weep past the cover joint, leading to visible drips and potential oil loss that can affect engine lubrication. The seal is manufactured to the original profile and cross-section, which matches the groove depth and cover clamping force of the engine it was designed for. On reinstallation, clean both sealing surfaces and ensure the seal seats fully into the groove before torquing the cover bolts to specification.