GENUINE REAR MAIN CRANKSHAFT SEAL

The rear main seal is essentially a rubber gasket that seals the rear of the crankshaft, exiting the engine and connecting with the transmission. The crankshaft is supported by main bearings, which receive oil to lubricate the crankshaft. The rear main seal prevents oil from getting out of the crankcase and into the transmission housing.

The gasket is made of rubber and can easily deteriorate and lead to oil leaks from normal wear and tear, worn main bearings, a bad PCV valve, low oil levels, or crankshaft or transmission alignment problems.

Fortunately, a bad rear main seal will only result in an oil leak and usually doesn’t have any severe or catastrophic issues outside of the leak. However, oil leaks can lead to low oil levels, which can cause more serious engine problems. Therefore, watch out for warning signs from your rear main seal and act as soon as possible whenever you notice a leak from it.