The good news is that the seals are relatively inexpensive components. And whether you are talking a front or rear main seal, replacement is the only cure when one malfunctions. Because they are exposed to such abuse, main seals are subject to a lot of wear and tear.

One of the most important parts of your car, crankshaft seals are typically made from a durable material, such as a synthetic rubber or silicone, designed to handle the extreme pressure and temperatures as well as the caustic chemicals in your engine oil. Since there are two ends of the crankshaft, there are two types of seals: the front crankshaft seal and the rear crankshaft seal, also known as the front main and rear main seals. Enclosed in what’s called a crankcase-the largest cavity in the engine block, just below the cylinders-the crankshaft must be completely lubricated, essentially submerged in oil, to spin nearly friction-free and do its job properly.Ĭonsequently, there are seals located at either end of the crankshaft that allow it to spin freely and keep engine oil from escaping the engine block, as well as prevent contaminants and other debris from entering and causing damage to the mechanism. One of the most important is the crankshaft, which converts rotary into linear motion i.e., it transforms the force created by the engine's pistons moving up and down into a force that moves in a circular motion that causes a car’s wheel to turn. What is the Front Crankshaft Seal all about?Ī number of mechanisms must work together to make your vehicle move forward. Service type Front Crankshaft Seal Replacement

Replacing 5.9 cummins rear main seal