390.010 Elring Seal Ring

This Crankshaft Shaft Seal from Elring (MPN: 390.010) is designed for use in German-manufactured engines, where it measures 20.0 mm high, 120.0 mm wide, and 120.0 mm deep. Its primary function is to seal the crankshaft, thereby preventing oil leaks and ensuring optimal engine performance. Dimensions are provided by the supplier and may include packaging dimensions. Crankshaft seal rings, also known as rear main seals, create a dynamic barrier against oil leakage between the crankshaft and engine block. Positioned at the rear of the crankshaft where it exits the engine, these seals prevent oil escaping from the engine’s oil pan. Typically constructed from nitrile rubber, silicone, or viton, designs include single-lip, dual-lip, and positively sealed variations to accommodate differing engine pressures and shaft speeds. Internal spring tension maintains consistent contact with the crankshaft surface, and materials are selected for resistance to petroleum products and elevated temperatures. Proper installation requires lubrication and precise alignment to ensure sealing effectiveness and prevent premature failure.