This crankshaft seal prevents oil leakage at the point where the crankshaft exits the engine block. It sits in the seal housing on the front or rear of the engine, maintaining a tight barrier between the rotating shaft and the stationary housing. A worn seal allows oil to weep past the shaft, leading to visible drips and a gradual loss of engine oil pressure. The seal is manufactured to the original geometry, matching the housing bore and shaft contact surface so that no additional shimming or adapter is required during installation. On reinstall, ensure the seal face is clean and lubricated before pressing it into the housing.