REAR CRANKSHAFT OIL SEAL. The rear crankshaft oil seal is a sealing component of the internal combustion engine designed to prevent engine oil leakage at the point where the crankshaft exits the engine block toward the flywheel or torque converter. The seal is installed between the engine block and the transmission housing and ensures oil tightness while allowing the crankshaft to rotate freely. The component is typically manufactured from oil-resistant rubber or high-temperature elastomers such as FKM with a reinforced metal frame and a spring-loaded sealing lip that maintains constant contact with the crankshaft surface. Its function is to retain engine oil inside the crankcase while preventing contamination of the clutch housing or automatic transmission torque converter area. Failure symptoms may include oil leakage between the engine and transmission, oil contamination of the clutch assembly or reduced lubrication efficiency. Causes may involve seal wear, crankshaft surface damage, excessive crankcase pressure or incorrect installation. Our catalog includes genuine OEM rear crankshaft seals, quality aftermarket replacements and inspected used sealing components free from deformation or lip damage. Used parts are checked for structural integrity and sealing surface condition. Selection is performed by VIN number, engine type and part number. Proper replacement ensures engine oil tightness and reliable engine operation.