It is an expensive fix because, most times, it requires removing the transmission or dismantling the engine. On front-wheel cars, the engine is typically mounted diagonal, so the back of the engine is the side opposite the one with idler pulleys, tensioners, and the serpentine belt. Engine oil leak from the rear crankshaft seal is hard to diagnose, except if you’re a gearhead like me because the oil usually drips from where the transmission connects to the engine and drips elsewhere, such as the crankcase. The rear crankshaft seal is usually made of silicone or rubber. The seal wears out over time as a result of corrosion from road salt, crankshaft rotational forces, and other environmental factors. Driving with a rear main seal leak can be very dangerous and can lead to total engine failure. The location of this seal makes detecting and fixing an oil leak challenging and complicated.

Just like every other mechanical component, some signs and symptoms will pop up to notify the driver of a defective or leaking rear crankshaft seal. Oil puddles : The most common sign of a rear crankshaft seal is oil puddles on the garage floor or the driveway. These oil puddles can be seen either when the vehicle is parked for a long time or while driving. However, the oil may leak from various parts of an engine. That said, it is wise to diagnose where the oil is leaking from before concluding it’s the rear main seal. #2001 5.9 CUMMINS REAR MAIN SEAL DRIVER#.#2001 5.9 CUMMINS REAR MAIN SEAL HOW TO#.

5.9 cummins rear main seal leak