460 2 Piece Rear Main Seal

E30tdf · #1 (**permalink**) 06-28-2008, 07:29 AM

1986 460 F250 4x4 T19 Trans

I have had to replace my rear main seal about every 18 months for the last 10 years. It holds back the oil for a while and then the leak is back. I am very careful about getting the seal in carefully and off set the seal mating services about 3/8 inch and RTV sealant where the bearing cap mates.

Do any of you have the same issue? What can be done to stop the oil leaking in these buggers?

Karl Keicher · #2 (**permalink**) 06-28-2008, 07:58 AM

I had a 390 that was the same way- the only way I was able to cure it was to remove the engine, flip it over, and remove the crank for the seal install. Its alot of work and sounds like a "no way" idea but working wick seals around the crank just doesnt seem to hold. So, I would say, nature of the beast?

Piffery1 · #3 (**permalink**) 06-28-2008, 02:57 PM

Sounds like you might have a groove worn in the crankshaft where the seal rides. Ended up replacing the crank on an old Chevy that had that problem.

jason85351 · #4 (**permalink**) 06-28-2008, 04:47 PM

go to the auto parts store and get yourself som Bars Leaks Rear Main Seal Treatment. That stuff has always sealed my rear main up. i use it every oil change