Rear main seal leak

Hi,

If somebody told you that you have a main seal leak what they meant was the round seal that is around the circumference of the output shaft of the crank. This same output shaft is basically hooked up to the transmission, or through to the transimission through a clutch. Well after some time, the round seal, it looks something like a flat donut, leaks. Imagine stretching a small spring around a shaft of steel and wrapping the spring in rubber. It will stop the oil from leaking along the shaft and out of the engine. After wear and tear, it needs to be replaced.

If this is the case, well, given that you have not said what type of vehicle you have, you would need to either pull the engine out or drop or pull out the transmission to get at the shaft and replace the $10 seal part. A lot of work for a small item but it will continue to leak until of course you run out of oil and ruin the motor.

I hope this helps somewhat.